KR20220030715A - Micro fluidic fuel cell and method to manufacture thereof - Google Patents

Abstract

Provided are a microfluidic fuel cell for minimizing electrical noise generated when the fuel cell is driven for a long time and a control method thereof. The microfluidic fuel cell includes: a body unit; a photosensitive unit provided on the upper surface of the body unit; a microchannel formed in the photosensitive unit and including a main flow path through which a fluid flows; a pair of fluid inflow prevention units formed to be spaced apart from the main flow path in the photosensitive unit; and a pair of electrode units printed on the upper surface of the photosensitive unit to connect the main flow path and the fluid inflow prevention unit.

Description

Microfluidic fuel cell and method for manufacturing the same

The present invention relates to a microfluidic fuel cell and a method for manufacturing the same, and to a microfluidic fuel cell for minimizing electrical noise generated when the fuel cell is driven for a long time and to a method for manufacturing the same.

A microbial fuel cell is a battery that converts chemical energy of organic matter contained in sewage or wastewater into electrical energy using microorganisms as a catalyst. do. Microbial fuel cells are attracting attention as a green energy technology in that they can produce electricity while processing environmental wastes containing organic matter.

Conventional microbial fuel cells move electrons to an electron acceptor through a proton exchange membrane, and most microbial fuel cells have a batch-type structure in which a buffer is injected into a reservoir above an anode electrode once. In addition, various types of fuel cells are being developed. Batch-type structure using graphite electrode and proton exchange membrane, continuous flow structure using Catbon cloth electrode and proton exchange membrane, stackable structure using folding, and batch-type structure There is a fuel cell with a structure in which the inoculation amount of microorganisms is increased by using a carbon cloth electrode and a proton exchange membrane and using a four-layer multi-anode electrode.

However, in the batch-type fuel cell, the reservoir that stores the fluid acts as a channel, and the anode electrode, cathode electrode, reservoir, and proton exchange membrane form a multi-layered structure of at least four layers. Since fastening using tape is inevitable, there is a problem that mass production is impossible in the mass production process of the product. In addition, due to the use of the proton exchange membrane for electron transfer, the batch-type fuel cell causes problems such as maintaining the hydration state of the proton exchange membrane, broken lines, and increased manufacturing cost. There is a problem in that electrical noise is generated. In addition, as the number of manual tasks such as manually manufacturing the inlet extension and the absorption pad and connecting to the fuel cell body increases, the reproducibility of the fuel cell decreases, and the injection and discharge of the positive electrode and the negative electrode are smooth during long-term operation. There was a problem that could not be done.

Accordingly, there is a need for a fuel cell capable of solving the problems caused by the conventional fuel cell as described above.

Republic of Korea Patent No. 10-1633526 ("Microfluid fuel cell and manufacturing method thereof", Erica Industry-Academic Cooperation Foundation, Hanyang University, 2016. 06. 20)

The technical problem to be achieved by the present invention is to solve this problem, and relates to a microfluidic fuel cell for minimizing electrical noise generated when the fuel cell is driven for a long time and a method for manufacturing the same.

The microfluidic fuel cell of the present invention includes a body part, a photosensitive part provided on an upper surface of the body part, a microchannel formed in the photosensitive part including a main flow path through which a fluid flows, and the main flow path in the photosensitive part. It includes a pair of fluid inflow prevention part spaced apart from and a pair of electrode parts printed on the upper surface of the photosensitive part so as to connect the main flow path and the fluid inflow prevention part.

The microchannel may include a plurality of inlets into which the fuel and the oxidizing agent are introduced.

The main flow path may be formed to have an increasing interval along the flow direction of the fluid.

The electrode part may be formed along the edge of the main flow path with respect to the flow direction of the fluid, so that the distance between the electrode parts is increased.

The microchannel may further include a pair of microchannels formed by a preset distance from the main flow path toward the fluid inflow prevention unit.

It may further include a hydrophobic part provided in a protruding shape between the fluid inflow prevention part and the micro-channel.

The method of manufacturing a microfluidic fuel cell of the present invention comprises the steps of: (a) forming a body part; (b) providing a photosensitive part on the upper part of the body part; and a main flow path through which a fluid flows in the photosensitive part (c) forming a microchannel and a fluid inflow prevention part spaced apart from the main flow path, and printing an electrode part on the upper surface of the photosensitive part to connect the main flow path and the fluid inflow preventing part.

In step (c), the microchannel may be formed in which a plurality of inlets into which fuel and an oxidizing agent are introduced into the photosensitive unit are formed.

In the step (c), the main flow path may be formed so that the interval increases along the flow direction of the fluid.

The step (d) may further include printing the electrode parts along the main flow path to form the electrode parts to increase the distance between the electrode parts.

The step (c) may further include forming a microchannel by removing the photosensitive part in advance by a preset distance from the main flow path toward the fluid inflow prevention part.

The step (c) may further include exposing the body part from which a part of the photosensitive part is removed, and heating and drying the exposed body part.

The heating and drying of the body part may include fixing a hydrophobic part provided in a protruding shape between the microchannel and the fluid inflow prevention part.

In the step (c), a pair of micro-channels formed by a preset distance from the main flow path in the direction of the fluid inflow part may be formed, and the fluid inflow prevention part may be spaced apart from the micro-channel.

After step (c), the step of purifying and filtering a solution in which MWCNTs, nitric acid, and sulfuric acid are mixed to form an electrode part mixture may be further included.

The microfluidic fuel cell and the method for manufacturing the same of the present invention prevent a phenomenon from flowing into an external connection electrode, thereby preventing electrical noise from occurring, and driving the fuel cell for a long time.

In addition, the microfluidic fuel cell and its manufacturing method of the present invention are manufactured based on paper, so the manufacturing cost is low, and carbon dioxide is not generated during the electrical energy generation process, and not only decomposes organic matter present in wastewater but also generates electrical energy. It has the advantage of being eco-friendly.

In addition, the present invention is manufactured based on paper, but has a feature that mass production is possible in the process of mass production of products because the fuel cell body, the absorbing member, and the electrode are integrally formed.

In addition, the present invention can improve the performance by reducing the internal resistance and increasing the supply amount of the anode electrode (Anolyte) and the cathode electrode (Catholyte) to improve the duration, current density and power density.

In addition, the present invention forms a carbon-based electrode by printing Multi-Walled Carbon Nano-Tube (MWCNT) with a screen printing technique between the anode electrode (Anolyte) and the cathode electrode (Catholyte). There is an advantage that a proton exchange membrane is unnecessary by forming a liquid-liquid interface.

1 is a diagram of a microfluidic fuel cell according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 .
3 is a view in which the electrode part of the microfluidic fuel cell according to the first embodiment of the present invention is removed.
FIG. 4 is a partially enlarged perspective view illustrating a part of FIG. 3 .
5 is a diagram of a microfluidic fuel cell according to a second embodiment of the present invention.
6 is a diagram of a microfluidic fuel cell according to a third embodiment of the present invention.
7 is a diagram of a microfluidic fuel cell according to a fourth embodiment of the present invention.
8 is a graph showing the current density and OCV according to the structural change of the microfluidic fuel cell of the present invention.
9 is a graph showing the current density and power density according to the structural change of the microfluidic fuel cell of the present invention.
10 is an EIS measurement graph according to a structural change of the microfluidic fuel cell of the present invention.
11 is a graph showing a duration measurement of a microfluidic fuel cell.
12 is a flowchart of a method for manufacturing a microfluidic fuel cell of the present invention.
13 is a view for explaining a method of manufacturing the main body of the present invention.
14 is a view for explaining a method for preparing a mixed solution of an electrode part of the present invention.
15 is a view for explaining a method of printing the electrode part on the main body of the present invention.

Advantages and features of the present invention and methods for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the microfluidic fuel cell of the present invention and a manufacturing method thereof will be described with reference to FIGS. 1 to 15 .

A microfluidic fuel cell according to a first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 , and a microfluidic fuel cell according to another embodiment of the present invention will be described with reference to FIGS. 5 to 7 . After a detailed description and detailed description of the performance of the microfluidic fuel cell of the present invention with reference to the graphs of FIGS. 8 to 11 , the method of manufacturing the microfluidic fuel cell of the present invention in FIGS. 12 to 15 is described Let me explain in detail.

1 is a view of a microfluidic fuel cell according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a microfluidic fuel cell according to a first embodiment of the present invention. is a view in which the electrode part is removed, and FIG. 4 is a partially enlarged perspective view illustrating a part of FIG. 3 .

The microfluidic fuel cell 1 of the present invention is a power generation system that uses a microorganism as a catalyst to generate electric energy by sending the microorganism to an electron acceptor through a process of decomposing an organic material (electron donor). The microfluidic fuel cell 1 does not emit carbon dioxide during the electric energy production process, and it decomposes organic matter present in environmental waste and simultaneously produces electric energy, thereby being eco-friendly.

In general, microfluidic fuel cells have a problem in that electrical noise is generated due to the connection of external connection electrodes. The microfluidic fuel cell 1 of the present invention may include a structure of the fluid inflow prevention part 30 formed on the upper surface of the body part 10 in order to prevent such electrical noise from occurring. The fluid inflow prevention unit 30 may prevent an electrical noise phenomenon that occurs when a fluid flows into the electrode unit 50 .

In addition, the microfluidic fuel cell 1 of the present invention is manufactured based on paper, so it is eco-friendly and has a low manufacturing cost. The microfluidic fuel cell 1 is manufactured in a single-layer structure in which the body portion 10, the absorption member, and the electrode portion 50 are integrated, so that mass production is possible during product mass production.

In addition, the electrode part 50 of the present invention includes a carbon-based electrode part 50 formed on the upper surface of the body part 10 by a screen printing technique. The electrode unit 50 has an advantage of unnecessary proton exchange membrane by forming a liquid-liquid interface between the anode electrode (Anolyte) and the cathode electrode (Catholyte).

Hereinafter, the structure and manufacturing method of the present invention that can exhibit the above characteristics will be described in detail.

1 and 2, the microfluidic fuel cell 1 of the present invention has a main body 10, a microchannel 20, a fluid inflow prevention part (see 30 in FIG. 3), and an electrode part ( 50). Specifically, the microfluidic fuel cell 1 of the present invention includes a body part 10, a photosensitive part 60 provided on the upper surface of the body part 10, and a main flow path 22 through which the fluid flows. A microchannel 20 formed in the light part 60, a pair of fluid inflow prevention parts 30 formed to be spaced apart from the main flow path 22 in the photosensitive part 60, and the main flow path 22 to prevent fluid inflow A pair of electrode parts 50 printed on the upper surface of the photosensitive part 60 to connect the parts 30 are included.

The body portion 10 forms the housing of the microfluidic fuel cell 1 and may be made of a paper material capable of absorbing fluid by capillary action. In one embodiment, the body portion 10 may be made of Whatman paper having a thickness of 180 μm and a pore size of 11 μm to form a substrate of the microfluidic fuel cell 1 .

The photosensitive part 60 may be formed by applying a photosensitive agent to the upper surface of the body part 10 . The photosensitive unit 60 is provided on the upper surface of the main body 10 to form a single layer, and may be formed by coating SU8-3035 (MicroChem, USA) on the upper surface of the main body 10, but is limited thereto. It may be formed using a known photosensitizer or a developed photosensitizer of a later technology.

By etching or removing the photosensitive part 60 , the microchannel 20 may be formed. Specifically, through the etching of the photosensitive part 60, the inlet 21 through which the fluid is introduced, the main flow path 22 through which the fluid flows, the microchannel 23 through which the fluid flows minutely, and the flow of the fluid are prevented. A fluid inflow prevention part 30, etc. may be formed, and the hydrophobic part 40 etc. which prevent the inflow of a fluid may be formed by the formation of the microchannel 23 and the fluid inflow prevention part 30.

The electrode part 50 may be formed by connecting the main flow path 22, the microchannel (refer to 23 in FIG. 3), the hydrophobic part (refer to 40 in FIG. 4), and the fluid inflow prevention part (refer to 30 in FIG. 3). , it may be formed in the form of printing the electrode part mixture.

The microchannel 20 forms a flow path of the fluid flowing in from one end on the upper surface of the body part 10, and may be formed by etching or removing the photosensitive part 60 provided on the upper surface of the body part 10. there is.

The microchannel 20 includes a pair of inlets 21a and 21b into which fluids, such as fuel and oxidizer, are introduced, and one main flow path 22 . In this case, one end of the plurality of inlets 21a and 21b may be formed to be spaced apart from each other, and the other ends of the plurality of inlets 21a and 21b may be formed to be connected to one end of the main flow passage 22 .

The pair of inlets 21a and 21b may be provided in a 'Y' shape such that the inlet ends are spaced apart from each other, but the ends are connected to the main flow passage 22 . The inlet 21 may be formed so that the inlet end is extended so that a pair is parallel to and symmetrical to each other. The inlet portions 21a and 21b may be formed to be longer than the remaining portions in which portions formed parallel to each other are refracted and converged. For example, the inlet 21 may be formed to extend and parallel to each other to have a length of 30 mm, and the remaining portions to be refracted and converged to have a length of about 17 mm. In addition, a diameter of a portion of the converging pair of inlets 21a and 21b may be 2.5 mm, and the length and diameter of the main flow path 22 forming one flow path therefrom are formed to be 18 mm and 5 mm, respectively. can be

The microchannel 20 may be formed by etching a portion of the photosensitive part 60, and the inlet 21 and the main flow path 22 are formed in a 'Y' shape as shown in the drawing. Since it is formed by scraping a part of the , it may be included in the photosensitive unit 60 to form a single layer.

The microchannel 20 in the first embodiment of the present invention will be described as an example in which a pair of inlets 21a and 21b into which the fuel and the oxidizer are respectively introduced are formed. However, the present invention is not limited thereto, and the microchannel 20 may be formed to include four inlets 21 through which the fuel and the oxidizing agent are introduced. In addition, the microchannel 20 shows a diagram in which the diameter of the main flow path 22 is uniformly formed along the flow direction of the fluid. However, the present invention is not limited thereto, and the main flow path 22 may be formed to increase in diameter along the flow direction of the fluid. This will be described later in detail through another embodiment.

The fluid flowing into the microchannel 20 of the present invention is absorbed by the body part 10 made of a paper material, and is self-pumped by the capillary action of the paper to the inlet part 21 and the main body. It is characterized by being able to absorb and flow along the flow path 22 . Accordingly, the microfluidic fuel cell 1 of the present invention has the advantage of not requiring a separate external pump.

The main flow path 22 may be printed on the upper surface of the flow path through which the fluid flows so that at least a portion of the pair of electrode units 50 is symmetrical, respectively. This will be described in detail later.

A pair of micro-channels 23 may be formed on both sides of the main channel 22 of the micro-channel 20 , respectively.

Referring to FIGS. 3 and 4 , the microchannel 23 is a kind of marking for confirming the exact position of the pair of electrode parts 50 printed on the upper surface of the main body part 10 , and It can be formed by extension. The micro-channel 23 may be formed to extend a predetermined distance from the main flow passage 22 in the direction of the fluid inflow prevention unit 30 .

A pair of micro-channels 23 may be respectively refracted toward the outside of the main channel 22 so as to be perpendicular to the main channel 22 at the end of the main channel 22 . Accordingly, the micro-channel 23 and the main flow passage 22 may be formed in a 'L' shape. A hydrophobic part 40 and a fluid inflow prevention part 30 may be formed on the side of the microchannel 23 , respectively.

The hydrophobic part 40 is to prevent the transfer of fluid from the microchannel 23 to the fluid inflow prevention part 30 , and may be formed on the upper surface of the body part 10 adjacent to the microchannel 23 . . Specifically, the hydrophobic portion 40 is formed by etching or removal of the photosensitive portion 60 , and is provided in a protruding shape between the fluid inflow prevention portion 30 and the microchannel 23 , and the microchannel 23 . block the flow of fluid through the

The size of the hydrophobic portion 40 may vary depending on the length of the microchannel 23 . Specifically, when the preset length of the micro-channel 23 extending from the main flow path 22 in the direction of the fluid inflow prevention part 30 increases, the size of the hydrophobic part 40 increases, and the micro-channel 23 ), when the preset length is shortened, the size of the hydrophobic portion 40 is reduced.

In other words, the hydrophobic portion 40 is formed on the upper surface of the body portion 10, and the photosensitive portion 60 having a hydrophobic property is applied between the microchannel 23 and the fluid inflow prevention portion 30 to be formed. can

The hydrophobic portion 40 is a portion in which the photosensitive portion 60 is not etched or removed between the microchannel 23 and the fluid inflow prevention portion 30 , and as shown in FIG. 2 , a lower portion of the electrode portion 50 . It may be formed to protrude upwardly from the upper surface of the main body 10 . The hydrophobic part 40 may form a part of the photosensitive part 60 , and may be made of the same SU8-3035 (MicroChem, USA) as the photosensitive part 60 .

The hydrophobic part 40 may be formed by curing with the photo-lithography process together with the photosensitive part 60, and is applied to the body part 10 and exposed to UV light 20 mV for 15 seconds, and then dried after exposure PEB ( Post Exposure Bake) can be formed by performing the process at 55° for 10 minutes. The hydrophobic portion 23 may be cured after exposure through a PEB process to be completely fixed to the upper surface of the body portion 10 , and this will be described in more detail through a manufacturing method.

The hydrophobic part 40 may be formed such that the interval between the microchannel 23 and the fluid inflow part preventing part 30 is 0.5 mm. Accordingly, the microchannel 23 and the fluid inflow prevention part 30 may be formed 0.5 mm apart by the hydrophobic part 40 . One end of the pair of hydrophobic parts 40 may be in contact with the pair of microchannels 23 , and the other end may be in contact with the fluid inflow prevention part 30 , respectively.

3 and 4, the fluid inflow prevention unit 30 forms a space spaced apart from the microchannel 23, and a pair of the main flow path 22 and the microchannel ( 23) can be formed spaced apart from. The hydrophobic portion 40 made of a hydrophobic material may be formed to be spaced apart from the main passage 22 and the micro passage 23 .

The fluid inflow prevention part 30 may be etched on the photosensitive part 60 so that one end is in contact with the hydrophobic part 40 , and a portion of the electrode part 50 may be printed on the upper surface. The electrode part 50 printed on the upper surface of the fluid inflow prevention part 30 is connected to an external electrode. The hydrophobic part 40 blocks the fluid flowing into the fluid inflow prevention part 30 from the main flow path 22 and the microchannel 23 so that the electrode part 50 printed on the upper surface of the fluid inflow prevention part 30 is It is possible to prevent the phenomenon of coming into contact with the fluid. Accordingly, the fluid inflow prevention unit 30 has the effect of preventing the generation of electrical noise and exhibiting a high yield.

The microchannel 20, the microchannel 23, the hydrophobic part 40, and the fluid inflow prevention part 30 including the inlet part 21 and the main channel 22 described above are the paper-based body part 10. It can be manufactured in one piece with a mass production.

The electrode unit 50 forms an electrode of the microfluidic fuel cell 1 , and may be printed on the upper surface of the photosensitive unit 60 to connect the main flow path 22 and the fluid inflow prevention unit 30 . The electrode part 50 may be formed by applying a carbon-based electrode part mixture solution (MWCNT paste) to the upper surface of the body part 10 . The electrode part mixture is purified by dispersing a mixture of nitric acid, sulfuric acid and Multi-Walled Carbon Nano-Tube (MWCNT) with ultrasonic waves for 30 minutes, and de-ionized water (De-lonized Water) in the purified solution. ), filtering the WMCNTs using a vacuum filter, and removing the remaining acid by pouring more deionized water into the filtered solution to extract only purified WMCNTs. The manufacturing process of the electrode part mixture solution for forming the electrode part 50 will be described later in more detail with reference to FIG. 14 .

Referring back to FIGS. 1 and 2 , one end and the other end are printed on the upper surface of the body unit 10 so that the main flow path 22 and the fluid inflow prevention unit 30 are connected to each other by printing a pair of electrode mixtures. The electrode part 50 may be formed. More specifically, the electrode part 50 is the electrode part mixture solution on the upper surface of the photosensitive part 60 to connect the main flow path 22 , the microchannel 23 , the hydrophobic part 40 and the fluid inflow prevention part 30 . It can be formed by printing.

In particular, the electrode part 50 may be printed at an accurate position on the upper surface of the body part 10 by the microchannel 23 . The electrode part 50 may be formed so that the length and thickness of a portion in contact with the upper surface of the main flow passage 22 is 15 mm and 1 mm, respectively. The electrode part 50 prevents a phenomenon in which one end to which the external electrode is connected comes into contact with the fluid flowing through the main channel 22 and the micro channel 23 by the hydrophobic part 40, thereby reducing electrical noise generated by reacting with the fluid. occurrence can be prevented.

The microfluidic fuel cell 1 according to the first embodiment of the present invention includes the structure of the fluid inflow prevention part 30 to prevent the fluid from flowing into the external connection electrode, thereby generating electrical noise. It has the characteristic of being able to prevent and run for a long time.

In addition, the present invention is formed on a paper-based basis, so the manufacturing cost is low, and has a feature that mass production is possible in a short time due to the integrated structure.

Hereinafter, a microfluidic fuel cell according to a second embodiment of the present invention will be described with reference to FIG. 5 .

5 is a front view of a microfluidic fuel cell according to a second embodiment of the present invention.

The microfluidic fuel cell 1a according to the second embodiment of the present invention excludes a microchannel 20a further including a pair of inlets 21a and 21b and another pair of inlets 21c and 21d. If it is, it is substantially the same as that of the first embodiment already described. Accordingly, the same reference numerals are attached to the components already described, and detailed descriptions thereof will be omitted.

Referring to FIG. 5 , the microfluidic fuel cell 1a according to the second embodiment of the present invention includes a microchannel 20a having a plurality of inlets 21a , 21b , 21c , 21d through which a fluid is introduced. . As shown in the drawing, the microchannel 20a may include four inlets 21a, 21b, 21c, and 21d through which fuel and an oxidizing agent are introduced, and one main flow path 22a. Specifically, the microfluidic fuel cell 1a includes the structure of the other pair of inlets 21c and 21d which are formed to be spaced apart from each other by 0.5 mm on both sides of the pair of inlets 21a and 21b. do. The microfluidic fuel cell 1a may be formed such that the main flow path 22a has a length of 18 mm. The pair of inlets 21a and 21b and the other pair of inlets 21c and 21d have one end to which fuel and oxidizer can be introduced, respectively, and the other end is connected to the main flow path 22a to form a multi-structure. A microchannel 20a may be formed.

Hereinafter, a microfluidic fuel cell according to a third embodiment of the present invention will be described with reference to FIG. 6 .

6A is a front view of the microfluidic fuel cell according to the third embodiment before electrode parts are printed, and FIG. 6B is a front view of the microfluidic fuel cell according to the third embodiment on which electrode parts are printed.

The microfluidic fuel cell 1b according to the third embodiment of the present invention has a main flow path 22b whose diameter increases along the flow direction of the fluid, and an electrode part 501 printed to match the shape of the main flow path 22b. Except for , it is substantially the same as the first embodiment already described. Accordingly, the same reference numerals are attached to the components already described, and detailed descriptions thereof will be omitted.

Referring to FIG. 6 , the microfluidic fuel cell 1b according to the third embodiment of the present invention includes a main flow path 22b formed to increase in diameter along the flow direction of the fluid, and a main flow path based on the flow direction of the fluid. It includes a pair of electrode parts 501a and 501b formed to increase a pair of spaced apart distances along the edge of the flow path 22b.

은 3.5mm로 형성될 수 있으며, 유체가 배출되는 메인유로(22b) 타단부의 직경

는 5mm로 형성되어

이

보다 작게 형성될 수 있다.The main flow path 22b forms a path through which the fluid introduced through the inlets 11a and 11b flows. The main flow path 22b may be formed such that one end is connected to the other end of the pair of inlet portions 11a and 11b, and extends from one end in the direction in which the fluid flows toward the other end to have a length of 18 mm. there is. In particular, as shown in FIG. 6A , the main flow path 22b has a structure in which the diameter increases from one end, which is the flow direction of the fluid, toward the other end. For example, the diameter of one end of the main flow path 22b merged from the pair of inlets 11a and 11b.

may be formed to be 3.5 mm, and the diameter of the other end of the main flow path 22b through which the fluid is discharged

is formed by 5 mm

this

It can be formed smaller.

이 직경

보다 작게 형성될 수 있다. 전극부(501)를 따라 흐르는 전류는 메인유로(22b)를 따라 흐르는 유체의 유동방향과 반대방향으로 흐르게 된다. 이에, 전극부(501)는 유체의 유동방향을 기준으로 한 쌍의 이격된 거리가 증가하도록 형성된다고 표현할 수 있으며, 전류가 흐르는 방향을 기준으로 한 쌍의 이격된 거리가 감소하는 형태인 수렴형 형태로 형성된다고 표현할 수 있다.According to the shape of the main flow path 22b, the electrode part 501 may be formed such that a distance between the pair of electrodes is changed. Referring to FIG. 6B , at least a portion of the electrode part 501 may be printed on the upper surface of the main flow path 22b along the edge of the main flow path 22b. The electrode part 501 may be formed so that the length of a part printed on the upper surface of the main flow path 22b has a length of 15 mm, and the distance between the pair of them varies according to the shape of the main flow path 22b. can The electrode part 501 has a diameter

tooth diameter

It can be formed smaller. The current flowing along the electrode part 501 flows in a direction opposite to the flow direction of the fluid flowing along the main flow path 22b. Accordingly, it can be expressed that the electrode part 501 is formed such that a pair of spaced distances increases with respect to the flow direction of the fluid, and a converging type in which a pair of spaced distances decreases with respect to the current flowing direction. It can be expressed as being formed by

As described above, a portion of the pair of electrode parts 501 in contact with the main flow path 22b is formed in a convergent shape with respect to the direction in which current flows, thereby forming a gap between the anode electrode Anolyte and the cathode electrode Catholyte. can reduce the internal resistance. In addition, the performance of the fuel cell is improved by increasing the supply amount of the anode electrode and the cathode electrode to improve the duration, current density, and power density of the microfluidic fuel cell 1b.

Hereinafter, a microfluidic fuel cell according to a fourth embodiment of the present invention will be described with reference to FIG. 7 .

7A is a front view of the microfluid according to the fourth embodiment before the electrode part is printed, and FIG. 7B is a front view of the microfluid according to the fourth embodiment on which the electrode part is printed.

The microfluidic fuel cell 1c according to the fourth embodiment of the present invention includes the inlets 11a, 11b, 11c, 11d of the second embodiment, the main flow path 22b and the electrode part 501 of the third embodiment. It consists of a combined structure. The microfluidic fuel cell 1c according to the fourth embodiment includes a plurality of inlets 11a, 11b, 11c, and 11d into which fuel and oxidizing agent are introduced, one main flow path 22b having a variable diameter, and a main flow path. Except for the electrode part 501 printed to fit the shape of (22b), it is substantially the same as the first embodiment described above. Accordingly, the same reference numerals are attached to the components already described, and detailed descriptions thereof will be omitted.

이 유체가 배출되는 타단부의 직경

보다 작게 형성될 수 있다.Referring to FIG. 7A , the microfluidic fuel cell 1c includes a microchannel 20a having a plurality of inlets 21a, 21b, 21c, and 21d through which a plurality of fuels and oxidizing agents are introduced, and four inlets. The other ends of 21a, 21b, 21c, and 21d may be connected to one main flow path 22b to form a microchannel 20c. As in the third embodiment described above, the main flow path 22b is formed in a structure in which the diameter increases from one end, which is the flow direction of the fluid, toward the other end. Accordingly, the main flow path 22b has a diameter of one end.

Diameter of the other end through which this fluid is discharged

It can be formed smaller.

이

보다 작게 형성될 수 있다. 또한, 전극부(501)는 전류가 흐르는 방향을 기준으로 수렴형 형태로 형성될 수 있다. Referring to FIG. 7B , according to the shape of the main flow path 22b, the electrode part 501 may be formed such that the distance between the pair of electrodes is increased based on the flow direction of the fluid. At least a portion of the electrode part 501 may be printed on the upper surface of the main flow path 22b along the edge of the main flow path 22b. Accordingly, the electrode part 501 is formed such that the distance between the pair of electrodes printed on the upper surface of the main flow path 22b increases according to the shape of the main flow path 22b,

this

It can be formed smaller. In addition, the electrode part 501 may be formed in a convergent shape based on the direction in which the current flows.

A portion of the pair of electrode units 501 in contact with the main flow path 22b is formed in a convergent shape based on a current flowing direction, thereby reducing a gap between the positive electrode and the negative electrode to reduce internal resistance. In addition, by increasing the supply amount of the anode electrode (Anolyte) and the cathode electrode (Catholyte), the duration, current density, and power density of the microfluidic fuel cell 1b are improved, so that the performance of the fuel cell is increased.

As described above, the microfluidic fuel cell of the present invention may be formed in various structures including different inlet portions 21, main flow passages 22, and electrode portions 50, and the fluid diffusion length and , performance, and duration, etc., show somewhat different results.

Hereinafter, it will be described in more detail in relation to the result values appearing according to each structure with reference to FIGS. 8 to 10 .

8 is a graph of the current density and OCV according to the structural change of the microfluidic fuel cell of the present invention, and FIG. 9 is a graph of the current density and the power density according to the structural change of the microfluidic fuel cell of the present invention, FIG. 10 is an EIS measurement graph according to the structural change of the microfluidic fuel cell of the present invention, and FIG. 11 is a duration measurement graph of the microfluidic fuel cell.

8 to 10, Couple.Y denotes the first embodiment, Couple.Convergence denotes the second embodiment, Multi.Y denotes the third embodiment, and Multi.Convergence denotes the micro-fuel fluid cell of the fourth embodiment. do.

이고, 제3 실시예(Multi.Convergence)에 따른 마이크로 유체 연료전지(1b)는

로 나타난다. 연료 전지 성능은 메인유로(22)의 직경의 변화가 있는 구조를 포함하는 제3 실시예(Multi.Convergence)의 마이크로 유체 연료전지(1b)에서 제1 실시예(Couple.Y)의 구조 대비 5.0%가 향상된 것으로 나타났다. 제2 실시예(Couple.Convergence)에 따른 마이크로 유체 연료전지(1a)는 최대전력밀도가

로, 유입부(21)의 개수가 늘어나게 되면서 제1 실시예(Couple.Y)의 구조 대비 21.9%의 연료전지 성능 향상된 것으로 나타났다. 8 and 9 , a linear sweep measurement graph according to a structural change of the microfluidic fuel cell according to the first to fourth embodiments of the present invention, and graphs according to current density and power density are shown. The present invention shows a slight difference in the performance of the fuel cell according to the structural change of the first to fourth embodiments. As a result of comparing the computational fluid analysis results, the maximum power density according to the structure of the microfluidic fuel cell 1 according to the first embodiment (Couple.Y) is

and the microfluidic fuel cell 1b according to the third embodiment (Multi.

appears as The fuel cell performance is 5.0 compared to the structure of the first embodiment (Couple.Y) in the microfluidic fuel cell 1b of the third embodiment (Multi.Convergence) including the structure in which the diameter of the main flow path 22 is changed % was improved. The microfluidic fuel cell 1a according to the second embodiment (Couple.Convergence) has a maximum power density

Therefore, as the number of inlets 21 increased, the fuel cell performance was improved by 21.9% compared to the structure of the first embodiment (Couple.Y).

로, 제1 실시예(Couple.Y)의 구조 대비 28.6%의 연료전지 성능 향상이 있는 것으로 나타났다.In addition, the microfluidic fuel cell 1c of the fourth embodiment (Multi.Convergence) has a structural change including a main flow path 22b having a change in the structure and diameter of the four inlets 21, and the maximum power density

As a result, it was found that there was a 28.6% improvement in fuel cell performance compared to the structure of the first embodiment (Couple.Y).

According to the present invention, the structure of the main flow path 22b in which the interval increases along the flow path of the fluid and the structure of a pair of electrode units 510 reducing the gap between the positive electrode and the negative electrode at the front end of the main flow path 22b are provided. can have the effect of reducing the internal resistance through In addition, according to the present invention, the supply amount of the positive electrode and the negative electrode can be increased through the structure of the multi-inlet including the plurality of inlets 21 , and the fuel cell performance is greatly improved while the diffusion area is reduced through the computational fluid analysis result. things can be looked at

Referring to FIG. 10 , EIS graphs according to structural changes of the microfluidic fuel cells according to the first to fourth embodiments of the present invention are shown. The microfluidic fuel cell 1b of the third embodiment (Multi.Y) adjusts the distance between the electrode parts 510 in contact with the main flow path 22b, so that the ohmic resistance ( Ohmic resistance) was reduced by 6.8%, and anode resistance was reduced by 28.5%.

The microfluidic fuel cell 1a of the second embodiment (Couple. Convergence) increases the number of inlets 21 to increase the supply amount of the positive electrode and the negative electrode and decreases the diffusion region, thereby reducing the diffusion area of the first embodiment (Couple. Compared to the structure of Y), the ohmic resistance is reduced by 16.7% and the anode resistance is reduced by 65.8%. In addition, the microfluidic fuel cell 1c of the fourth embodiment (Multi.Convergence) has an ohmic resistance of 24.4% and an anode resistance of 24.4% compared to the structure of the first embodiment (Couple.Y). A decrease of 71.4% can be seen.

Referring to FIG. 11 , in the microfluidic fuel cells 1 and 1c, the duration of the microfluidic fuel cells 1 and 1c can be observed through the chronopotentiometry method of looking at the change in OCV over time and the voltage over time while applying a constant current.

11A is a graph showing a performance comparison measured according to a change in the structure of a fuel cell in a continuous flow condition. Referring to FIG. 11A , the duration of the microfluidic fuel cell 1c according to the fourth embodiment (Multi.Convergence) in the continuous flow condition was 8 hours and 26 minutes, and the first embodiment (Couple.Y) The duration of the microfluidic fuel cell 1 according to the method was 3 hours and 43 minutes. The duration of the fuel cells according to the fourth embodiment (Multi.Convergence) and the first embodiment (Couple.Y) exhibits a difference of 2.2 times or more. The microfluidic fuel cell 1c of the fourth embodiment (Multi.Convergence) has a faster supply rate of the positive electrode and the negative electrode than the structure of the microfluidic fuel cell 1 of the first embodiment (Couple.Y), so wet absorption The pad area may appear high. In addition, in the microfluidic fuel cell, pores of the absorbent pad are clogged due to crystallization of potassium ferricyanide due to drying of catholyte, anolyte contamination by external bacteria in the air, and the like. At this time, since the structure of the fourth embodiment (Multi.Convergence) relieves pore clogging to some extent at a faster supply rate than the structure of the first embodiment (Couple.Y), it can represent the result of improving the duration by more than two times. .

11B is a graph showing a performance comparison measured according to a change in the fuel cell structure under the stop flow condition. 11B, in the Stop Flow condition, the duration of the structure of the fourth embodiment (Multi.Convergence) is 46 minutes, the duration of the first embodiment (Couple.Y) is 36.7 minutes, and the fourth embodiment It can be seen that the structure of (Multi.Convergence) shows a longer duration with a difference of about 9 minutes. In the Stop Flow condition, the positive electrode and the negative electrode are not continuously supplied, and the supply rate is significantly lowered, so it can be seen that both the duration and the voltage are significantly different in the Continuous Flow and Stop Flow conditions.

Hereinafter, a method of manufacturing a microfluidic fuel cell of the present invention will be described in detail with reference to FIGS. 12 to 15 .

12 is a flowchart of a method of manufacturing a microfluidic fuel cell of the present invention, FIG. 13 is a view for explaining a method of manufacturing a main body of the present invention, and FIG. 14 is a method of manufacturing a mixed solution of an electrode unit of the present invention , and FIG. 15 is a view for explaining a method of printing the electrode part on the main body part of the present invention.

Referring to FIG. 12 , the method of manufacturing the microfluidic fuel cell 1 of the present invention includes (a) step (S200) of forming the body portion 10, and (b) step (b) of providing the photosensitive portion 60 ( S210), (c) of forming the microchannel 20 and the fluid inflow prevention part 30 (S220), and the step of printing the electrode part 50 (S230).

Specifically, (a) step (S200) of forming the body part 10, (b) step (S210) of providing the photosensitive part 60 on the upper part of the body part 10, and the main flow path through which the fluid flows (c) forming the microchannel 20 including (22) and the fluid inflow prevention part 30 spaced apart from the main flow path 22 (S220), the main flow path 22 and the fluid inflow prevention part and (d) step (S230) of printing the electrode part 50 on the upper surface of the photosensitive part 60 to connect (30).

In the method of manufacturing the microfluidic fuel cell 1 of the present invention, the process of forming the body part 10, the process of providing the photosensitive part, and the process of forming the microchannel and the fluid inflow prevention part will be described with reference to FIG. 13 And, after the process of forming the mixed solution of the electrode part 50 is described with reference to FIG. 14 , the process of printing the electrode part 50 on the upper surface of the photosensitive part 60 will be described in detail with reference to FIG. 15 . to do it

Referring to FIG. 13 , the body portion 10 is formed by providing a Whatmanji (S200). In this case, the main body 10 may be manufactured using Whatman paper having a thickness of 180 um and a pore size of 11 um.

A photosensitive agent having hydrophobic properties is wetted on the upper portion of the body portion 10 made of Whatman paper and cured to prepare the photosensitive portion 60 ( S210 ). A photosensitive agent having a hydrophobic property is applied to the outer surface of the body part 10 and the photosensitive agent is kept wet for 10 minutes to form the photosensitive part 60 on the upper surface of the body part 10 .

A microchannel 20 including a main flow path 22 through which a fluid flows is formed in the photosensitive unit 60 , and a fluid inflow prevention unit 30 spaced apart from the main flow path 22 is formed ( S230 ). The microchannel 20 and the fluid inflow prevention part 30 are formed by removing a part of the predetermined photosensitive part 60 corresponding to the predetermined position where the microchannel 20 and the fluid inflow prevention part 30 are formed. can do.

The microchannel 20 and the fluid inflow prevention part 30 are formed by etching or removing a portion of the photosensitive part 60 , and may form the same layer as the photosensitive part 60 . In particular, in the process of forming the microchannel 20 and the fluid inflow prevention part 30 by etching or removing the photosensitizer 60 , a plurality of fuels and oxidizing agents are introduced from the inlet 21 and the inlet 21 . A microchannel 20 including one main flow path 22 through which a fluid flows may be formed.

In addition, the microchannel 23 extending in both directions perpendicular to the main flow path 22 by etching another portion of the predetermined photosensitizer 60 and the fluid inflow prevention part 30 formed spaced apart from the microchannel 23 ) can be formed. In this process, the hydrophobic part 40 that is not etched between the microchannel 23 and the fluid inflow prevention part 30 is formed to protrude from the main body 10 to separate the microchannel 23 and the fluid inflow prevention part 30 . ) can be formed. In the step of removing the photosensitizer, the main flow path 22 may be formed so that the diameter increases along the flow direction of the fluid, and the microchannel 20 according to various embodiments, such as four inlets, is formed in the body portion 10. It can be formed on the upper surface of

It is applied on the upper surface and scraped off a portion of the predetermined photosensitive part 60, and the Whatman paper, in which the microchannel 20, the microchannel 23, and the fluid inflow prevention part 30 are formed, is soft baked at 85°C for 10 minutes and dried. The body part 10 integrated with the photosensitive part 60 may be formed. At this time, separate Whatman papers are arranged on the upper and lower surfaces of the Whatman paper to absorb the undried photosensitizer, and then, the separate photosensitizers disposed on the upper and lower surfaces of the Whatman paper are removed.

A portion of the photosensitive part 60 is removed and the dried body part 10 is exposed to 20 mV for 15 seconds using UV light, and the exposed body part 10 is PEB (Post Exposure Bake) at 55 ° C. for 10 minutes. proceed with the process The manufacturing method of the microfluidic fuel cell 1 of the present invention includes the steps of exposing the body part from which a part of the photosensitive part 60 is removed, and heating and drying the exposed body part into the body part 10 through the PEB process. After exposure, the cured photosensitive portion 60 may be completely fixed.

Specifically, through the PEB process, there is a feature that can completely fix the hydrophobic portion 40 to which the photosensitive agent is applied so as to partition the microchannel 23 and the fluid inflow prevention portion 30 . The main body 10 that has gone through the PEB process proceeds with the Develop process. The Develop process is a process of removing the Photo Resist from a certain area to form an image by separating the necessary and unnecessary parts using a developer after alignment and exposure. The main body 10 was immersed in SU8-Developer for 15 minutes, IPA (Icosapentaenoic Acid) solution for 5 minutes, and de-ionized water (DI Water) for 10 minutes in the Develop process, and then in an oven at 40°C. It can be dried to form the paper-based body part 10 in which the microchannel, the microchannel 23 , the hydrophobic part 40 and the fluid inflow prevention part 30 are formed. The electrode part 50 may be printed on the upper surface of the body part 10 formed through the above process to form the microfluidic fuel cell 1 .

On the other hand, a photoresist (PR) includes a positive PR and a negative PR. The photosensitive unit 60 is provided as a negative PR on the upper surface of the main body 10 so that the hydrophobic portion 40, which is a portion receiving light, is solidly hardened and the negative PR is removed from the microchannel 20, The micro-channel 23 and the fluid inflow prevention part 30 are characterized in that they can be easily dissolved by a developing solution.

Referring to FIG. 14 , a process of forming the electrode part mixture to be printed on the body part 10 is shown. The electrode part mixture may be formed by purifying and filtering a solution in which nitric acid and sulfuric acid are mixed. Specifically, the electrode part mixture is mixed with 10 mg of MWCNT, 10 mg of nitric acid (HNO ₃ , 70 wt%), and 20 mL of sulfuric acid (H ₂ SO ₄ , 95-98 wt%), and is purified while dispersing with ultrasonic waves for 30 minutes. MWCNTs are filtered using a vacuum filter for a total of 100 mL of a solution formed by mixing 70 mL of DI Water with a purified 30 mL solution. By pouring more DI Water into the filtered solution, the acid remaining in MWCNTs can be removed, and only purified MWCNTs can be left.

Thereafter, cellulose (Cellulose, 5wt%) and EMIM (1-Ethyl-3-methylimidazolium acetate, 95wt%) are mixed and ultrasonicated at 60° C. for 1 hour to prepare a Cellulose-ionic liquids solution. After mixing the prepared Cellulose-ionic liquids solution (95% mass) and MWCNT (5wt%) in a mass ratio, it is possible to form an electrode part mixture by grinding for 15 minutes. The electrode part 50 may be formed by printing the electrode part mixture formed through the above process on the upper surface of the photosensitive part 60 .

Referring to FIG. 15 , a diagram of manufacturing the microfluidic fuel cell 1 in which the electrode part 50 is formed by printing the electrode part mixture solution on the upper surface of the photosensitive part 60 is shown. A body in which the microchannel 20, the microchannel 23, the hydrophobic part 40, the fluid inflow prevention part 30 and the photosensitive part 60 are formed of the OHP film (Overhead Projector Film) processed to form the carbon electrode After fixing to the upper surface of the part 10, the electrode part mixture is applied to the upper surface of the OHP film. If the electrode mixture applied on the top surface of the OHP film is uniformly pushed using a film applicator made of a metal bar with a smooth surface, the electrode mixture can be printed in the form of an electrode on a paper substrate through the hole in the OHP film. there is. When the electrode part mixture is printed on the upper surface of the body part 10 , the OHP film is removed.

The main body 10 from which the OHP film is removed is heated in an oven at 40° C. for 60 minutes. At this time, when the temperature of the oven in the body part is 45℃ or higher, [EMIM][AC] contained in the electrode part mixture is completely cured from the top surface, so that the positive electrode and the negative electrode do not flow into the channel. Let it be heated in the oven. The heated body 10 is immersed in DI water for 20 minutes to remove [EMIM][AC] contained in the electrode part mixture.

Thereafter, the main body 10 may be heated again in an oven at 50° C. for 20 minutes to completely print on the upper surface of the main body 10 of the electrode unit 50 . As such, in the method of manufacturing a microfluidic fuel cell, a liquid-liquid interface is formed between an anode electrode (Anolyte) and a cathode electrode (Catholyte) by printing MWCNTs using a screen printing technique to form the carbon-based electrode part 50 . By forming a proton exchange membrane, there is an unnecessary advantage.

The microfluidic fuel cell of the present invention can form the microfluidic fuel cells 1, 1a, 1b, and 1c through the above process. The microfluidic fuel cell 1 of the present invention can prevent the occurrence of electrical noise by preventing the fluid from flowing into the external connection electrode, and thus can be driven for a long time.

In addition, the present invention has the advantage of being eco-friendly by producing electric energy while decomposing organic matter present in wastewater without generating carbon dioxide during the process of generating electric energy, as it is produced based on paper, so that the manufacturing cost is low. In addition, the present invention has a structure including a plurality of inlet portions 21 as in the second to fourth embodiments, and the diameter of the main passage 22 and the electrode portion 50 follows the flow direction of the fluid. Including a structure formed to be increased, there is a characteristic that can improve the duration, current density and power density by reducing internal resistance and increasing the supply amount of the anode electrode (Anolyte) and the cathode electrode (Catholyte). Accordingly, the present invention can improve fuel cell performance.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains will realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. you will understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

1, 1a, 1b, 1c: microfluidic fuel cell
10: body part
20, 20a, 20b, 20c: micro channel
21, 21a, 21b, 21c, 21d: inlet
22, 22a, 22b: Main Euro
23, 23a, 23b: microchannel
30, 30a, 30b: fluid inflow prevention part
40, 40b: hydrophobic part
50, 50a, 50b: electrode part
60: photosensitive unit

Claims (15)

body part;
a photosensitive part provided on the upper surface of the body part;
a microchannel formed in the photosensitive unit including a main flow path through which a fluid flows;
a pair of fluid inflow prevention units formed to be spaced apart from the main flow path in the photosensitive unit; and
and a pair of electrode parts printed on an upper surface of the photosensitive part to connect the main flow path and the fluid inflow prevention part. According to claim 1,
The microchannel is
A microfluidic fuel cell comprising a plurality of inlets through which fuel and oxidant are introduced. According to claim 1,
The microfluidic fuel cell is formed such that the main flow passage has an increasing interval along the flow direction of the fluid. 4. The method of claim 3,
The electrode part is formed along the edge of the main flow path based on the flow direction of the fluid, and the distance between the electrode parts is increased to increase the microfluidic fuel cell. According to claim 1,
The microchannel is
The microfluidic fuel cell further comprising a pair of microchannels formed by a predetermined distance from the main flow path toward the fluid inflow prevention unit. 6. The method of claim 5,
The microfluidic fuel cell further comprising a hydrophobic part provided in a protruding shape between the fluid inflow prevention part and the micro-channel. (a) forming a body portion;
(b) providing a photosensitive part on the upper part of the body part;
(c) forming a microchannel including a main flow path through which a fluid flows in the photosensitive unit, and a fluid inflow prevention unit spaced apart from the main flow path; and
(d) printing an electrode part on the upper surface of the photosensitive part so as to connect the main flow path and the fluid inflow prevention part;
A method of manufacturing a microfluidic fuel cell comprising a. 8. The method of claim 7,
Step (c) is,
A method of manufacturing a microfluidic fuel cell in which the microchannel is formed with a plurality of inlets through which fuel and an oxidizing agent are introduced into the photosensitive unit. 8. The method of claim 7,
Step (c) is,
A method for manufacturing a microfluidic fuel cell, wherein the main flow path is formed to increase a gap along the flow direction of the fluid. 10. The method of claim 9,
Step (d) is,
The method of manufacturing a microfluidic fuel cell further comprising: printing the electrode parts along the main flow path to form the electrode parts to increase the distance between the electrode parts. 8. The method of claim 7,
Step (c) is,
The microfluidic fuel cell manufacturing method further comprising: removing the photosensitive part by a preset distance from the main flow path toward the fluid inflow prevention part to form a micro flow path. 12. The method of claim 11,
Step (c) is,
The method of manufacturing a fluid fuel cell further comprising: exposing the body part from which the photosensitive part has been removed to light; and heating and drying the exposed body part. 13. The method of claim 12,
The step of heating and drying the body part,
A method for manufacturing a fluid fuel cell, characterized in that the hydrophobic part is fixed in a protruding shape between the microchannel and the fluid inflow prevention part. According to claim 1,
Step (c) is,
A method of manufacturing a microfluidic fuel cell in which a pair of microchannels formed by a predetermined distance from the main flow path toward the fluid inlet is formed, and the fluid inflow prevention part is spaced apart from the microchannel. 8. The method of claim 7,
After step (c),
The method of manufacturing a microfluidic fuel cell further comprising the step of purifying and filtering a mixed solution of MWCNTs, nitric acid, and sulfuric acid to form an electrode part mixture.

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