CN216720008U

CN216720008U - Microbial fuel cell

Info

Publication number: CN216720008U
Application number: CN202122959968.5U
Authority: CN
Inventors: 凌宇祥; 于广平; 唐嘉丽
Original assignee: Guangzhou Institute Of Industrial Intelligence; Shenyang Institute of Automation of CAS
Current assignee: Guangzhou Institute Of Industrial Intelligence; Shenyang Institute of Automation of CAS
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-06-10
Anticipated expiration: 2031-11-29

Abstract

The embodiment of the utility model provides a microbial fuel cell, which comprises a front end plate, an anode current collector, an anode plate, an anode, a first sealing gasket, a proton exchange membrane, a second sealing gasket, a cathode and a rear end plate which are sequentially and fixedly arranged together, wherein the anode, the proton exchange membrane and the cathode are tightly attached to each other through a second accommodating cavity and a third accommodating cavity between the first sealing gasket and the second sealing gasket, so that the mutual close proximity is realized, and the transfer path of protons in a solution from the anode to the cathode is reduced, thereby reducing the time for the protons to transfer from the anode to the cathode, improving the reaction rate in the microbial fuel cell, reducing the internal resistance of the microbial fuel cell and improving the electricity generation performance of the microbial fuel cell.

Description

Microbial fuel cell

Technical Field

The utility model relates to the technical field of fuel cells, in particular to a microbial fuel cell.

Background

A Microbial Fuel Cell (MFC) is a device which uses special microbes as electrochemical reaction catalysts and can directly convert chemical energy in degradable organic matters in a water sample into electric energy. MFCs can be classified in configuration into a single-chamber type, a double-chamber type, and a multi-chamber type. A single-chamber MFC consists of only one electrode chamber, which is an anode chamber, typically separated from a cathode by a proton exchange membrane; the double-chamber MFC is composed of two electrode chambers, one is an anode chamber (anaerobic), the other is a cathode chamber (contacting with air), in the anode chamber, organic matters are subjected to oxidation reaction under the action of microorganisms to generate protons, and electrons are transferred to the anode; the anode chamber and the cathode chamber are separated by a proton exchange membrane, and the outside of the anode chamber and the cathode chamber is connected in series by a lead to form a circulating circuit; on the cathode, electrons pass through an external circuit, protons pass through a proton exchange membrane to reach the cathode, and are combined with oxygen to form water.

In the related art, the output performance of the current microbial fuel cell is far from the practical application, and an important limiting factor is the microbial structure of the microbial fuel cell. The impact of the microbial fuel cell construction on performance is manifested in: the anode and cathode are spaced too far apart, and the time for protons to migrate from the anode to the cathode increases, affecting the efficiency of the reaction and, in turn, the output performance of the cell.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, an object of the present invention is to provide a microbial fuel cell, which solves the technical problems in the related art that when the distance between an anode and a cathode is too large, the time for protons to migrate from the anode to the cathode is increased, the reaction efficiency is affected, and the output performance of the cell is affected.

The embodiment of the utility model adopts the following technical scheme:

the present invention provides the microbial fuel cell, comprising:

a front end plate;

an anode current collector disposed proximate the front end plate;

the anode plate is provided with a first accommodating cavity, and the anode current collector is arranged in the first accommodating cavity;

the anode is positioned on one side of the anode plate, which is far away from the front end plate, is arranged close to the anode plate and is tightly attached to the end part of the anode current collector;

the first sealing gasket is positioned on one side of the anode, which is far away from the anode plate, is tightly attached to the anode and is provided with a second accommodating cavity;

the proton exchange membrane is positioned on one side of the first sealing gasket, which is far away from the anode, and is tightly attached to the first sealing gasket;

the second sealing gasket is positioned on one side of the proton exchange membrane, which is far away from the first sealing gasket, and is tightly attached to the proton exchange membrane;

the cathode is positioned on one side, far away from the proton exchange membrane, of the second sealing gasket and is tightly attached to the second sealing gasket; and

the rear end plate is positioned on one side of the cathode, which is far away from the second sealing gasket, and is tightly attached to the second sealing gasket;

the front end plate, the anode plate, the first sealing gasket, the second sealing gasket and the rear end plate are sequentially connected together.

In some embodiments of the present application, the anode plate comprises:

the first containing cavity is positioned on the anode plate body, and two sides of the first containing cavity are respectively adjacent to the front end plate and the anode:

the anode plate liquid inlet is arranged on the anode plate body, is communicated with the first accommodating cavity and is used for allowing anode liquid to enter the first accommodating cavity;

the anode plate liquid outlet is arranged on the anode plate body, is communicated with the first accommodating cavity and is used for discharging the anode liquid;

the anode plate reference electrode socket is arranged on the anode plate body and communicated with the first accommodating cavity;

and

the anode plate slag discharge port is arranged on the anode plate body, is communicated with the first accommodating cavity and is used for discharging impurities carried in the anolyte;

the anode plate liquid inlet, the anode plate liquid outlet, the anode plate reference electrode socket and the anode plate slag discharge port are respectively positioned on different side surfaces of the anode plate body.

In some embodiments of the present application, the anode plate liquid outlet and the anode plate reference electrode socket are tangent at the first accommodating chamber and connected to the upper end of the first accommodating chamber, and the anode plate liquid inlet and the anode plate slag discharge opening are respectively connected to the bottom end of the first accommodating chamber.

In some embodiments of the present application, further comprising:

the two side surfaces of the anode guide piece are respectively clung to the front end plate and the anode plate;

and the two side surfaces of the cathode guide piece are respectively clung to the cathode and the rear end plate.

In some embodiments of the present application, further comprising:

the negative plate is positioned between the rear end plate and the cathode and is provided with a second accommodating cavity;

and the cathode current collector is positioned in the second accommodating cavity, and the end part of the cathode current collector is tightly attached to the cathode.

In some embodiments of the present application, the structure of the cathode plate is the same as that of the anode plate, the thickness of the anode plate is greater than that of the cathode plate, and the cross sections of the first accommodating cavity and the second accommodating cavity are both square with rounded corners.

In some embodiments of the present application, the cathode current collector and the anode current collector are both graphite plates.

In some embodiments of the present application, one surface of the graphite plate has at least two ridges extending outward, a groove is formed between adjacent ridges, and the end of the ridge is tightly attached to the cathode or the anode.

In some embodiments of the present application, the aperture ratio of the flow field of the ridges and the grooves ranges from 40% to 70%; the ratio of the width of the groove to the width of the ridge ranges from 1: 1.2 to 2.0.

In some embodiments of the present application, the front end plate, the cathode plate, the anode plate and the rear end plate are all made of organic glass material.

Compared with the prior art, the embodiment of the utility model has the beneficial effects that:

the microbial fuel cell comprises a front end plate, an anode current collector, an anode plate, an anode, a first sealing gasket, a proton exchange membrane, a second sealing gasket, a cathode and a rear end plate which are sequentially and tightly arranged together, wherein the anode, the proton exchange membrane and the cathode are tightly attached to each other through a second accommodating cavity and a third accommodating cavity between the first sealing gasket and the second sealing gasket, so that the mutual close proximity is realized, and the transfer path of protons in a solution from the anode to the cathode is reduced, thereby reducing the time for the protons to transfer from the anode to the cathode, improving the reaction rate in the microbial fuel cell, reducing the internal resistance of the microbial fuel cell and improving the electricity production performance of the microbial fuel cell. In addition, a graphite plate is used as a current collector, is arranged in a cavity of the anode current collector and is tightly attached to the anode, so that the function of fixing the anode can be achieved; meanwhile, the graphite has high conductivity and good biocompatibility, and can be used as a current collector to reduce the internal resistance of the microbial fuel cell and can also be used as an extension of an anode to further improve the attachment amount of microorganisms.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view showing the structure of a single-chamber type microbial fuel cell according to the present invention;

FIG. 2 is a schematic structural view of a dual chamber microbial fuel cell according to the present invention;

FIG. 3 is a schematic structural diagram of an anode plate of a microbial fuel cell provided in the present invention;

FIG. 4 is a schematic structural view of a cathode plate of a microbial fuel cell according to the present invention;

fig. 5 is a schematic structural diagram of a graphite plate of a microbial fuel cell provided in the present invention.

Wherein:

1. a front end plate, 2 and an anode plate; 3. an anode; 4. a proton exchange membrane; 5. a cathode; 6. a rear end plate; 71. an anode lead; 72. a cathode lead; 8. an anode current collector; 81. a dorsal spine; 82. a trench; 9. a third gasket; 10. a first gasket; 11. a locking member; 13. a cathode plate; 14. a cathode current collector; 15. an anode plate liquid inlet; 16. an anode plate liquid outlet; 17. an anode plate reference electrode socket; 18. an anode plate slag discharge port; 19. a first accommodating cavity; 20. reserving holes in the anode plate screw; 21. a cathode plate liquid inlet; 22. a cathode plate liquid outlet; 23. a negative plate reference electrode socket; 24. a slag discharge port of the negative plate; 25. a sixth accommodating cavity; 26. reserving a hole on a screw rod of the negative plate; 30. a fourth gasket; 40. a fifth gasket; 50. a sixth gasket; 60. a second gasket.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only used for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, cannot be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

As shown in fig. 1-5; the present invention provides a microbial fuel cell comprising:

a front end plate 1;

an anode current collector 8 disposed adjacent to the front end plate 1;

the anode plate 2 is provided with a first accommodating cavity 19, and the anode current collector 8 is arranged in the first accommodating cavity 19;

the anode 3 is positioned on one side of the anode plate 2 away from the front end plate 1, is arranged close to the anode plate 2 and is tightly attached to the end part of the anode current collector 8;

the first sealing gasket 10 is positioned on one side of the anode 3, which is far away from the anode plate 2, is tightly attached to the anode 3, and is provided with a second accommodating cavity;

the proton exchange membrane 4 is positioned on one side of the first sealing gasket 10, which is far away from the anode 3, and is tightly attached to the first sealing gasket 10;

the second sealing gasket 60 is positioned on one side of the proton exchange membrane 4, which is far away from the first sealing gasket 10, is tightly attached to the proton exchange membrane 4, and is provided with a third accommodating cavity;

the cathode 5 is positioned on one side, far away from the proton exchange membrane 4, of the second sealing gasket 60 and is tightly attached to the second sealing gasket 60; and

the rear end plate 6 is positioned on one side of the cathode 5, which is far away from the second sealing gasket 60, and is tightly attached to the second sealing gasket 60;

the front end plate 1, the anode plate 2, the first sealing gasket 10, the second sealing gasket 60 and the rear end plate 6 are sequentially connected together.

The embodiment of microbial fuel cell, microbial fuel cell is including fastening the front end plate 1 that sets up together in proper order, anode current collector 8, anode plate 2, positive pole 3, first sealed pad 10, proton exchange membrane 4, the sealed 60 of second, negative pole 5 and back end plate 6, wherein, positive pole 3, proton exchange membrane 4, negative pole 5 are hugged closely for realizing through second holding chamber and third holding chamber between first sealed pad 10 and the sealed 60 of second and are closely attached to each other, reduced proton and moved the transfer path to negative pole 5 from positive pole 3 in solution, thereby reduced the time that proton moved to negative pole 5 from positive pole 3, the reaction rate in the microbial fuel cell has been improved, the internal resistance of microbial fuel cell has been reduced, the electrogenesis performance of microbial fuel cell has been improved.

In addition, a graphite plate is used as a current collector, is arranged in a cavity of the anode current collector and is tightly attached to the anode, so that the function of fixing the anode can be achieved; meanwhile, the graphite has high conductivity and good biocompatibility, and can be used as a current collector to reduce the internal resistance of the microbial fuel cell and can also be used as an extension of an anode to further improve the attachment amount of microorganisms.

Wherein, the front end plate 1 the anode plate 2 the first sealed pad 10 the second is sealed to fill up 60 and the back end plate 6 passes through retaining member 11 fastening connection in proper order together, wherein, retaining member 11 is bolt and nut, passes through the bolt the front end plate 1 the anode plate 2 the first sealed pad 10 the second is sealed to fill up 60 and back end plate 6 to close with the nut soon, through right the front end plate 1 with the effort of fastening is applyed to back end plate 6, makes the front end plate 1 the anode plate 2 the first sealed pad 10 the second is sealed to fill up 60 and back end plate 6 is fastened together.

The prepared anode current collector 8 is placed in the first accommodating cavity 19, so that the anode current collector 8 can be tightly attached to the anode 3 and can be pressed against the anode 3, and the purpose of preventing the position of the anode current collector from being deviated is to ensure.

In some embodiments of the present application, the anode plate 2 comprises:

the first containing cavity 19 is located above the anode plate body, and two sides of the first containing cavity are respectively adjacent to the front end plate 1 and the anode 3:

the anode plate liquid inlet 15 is arranged on the anode plate body, is communicated with the first accommodating cavity 19 and is used for allowing anode liquid to enter the first accommodating cavity 19;

an anode plate liquid outlet 16, which is arranged on the anode plate body, is communicated with the first accommodating cavity 19 and is used for discharging the anode liquid;

the anode plate reference electrode socket 17 is arranged on the anode plate body and is communicated with the first accommodating cavity 19;

and

the anode plate slag discharge port 18 is arranged on the anode plate body, is communicated with the first accommodating cavity 19 and is used for discharging impurities carried in the anolyte;

the anode plate liquid inlet 15, the anode plate liquid outlet 16, the anode plate reference electrode socket 17 and the anode plate slag discharge port 18 are respectively positioned on different side surfaces of the anode plate body.

When the anode plate 2 is in operation, anolyte enters from the anode plate liquid inlet 15, passes through the anode 3 cavity and then flows out from the anode plate liquid outlet 16, and impurities which can be carried in the anolyte are discharged through the anode plate slag discharge port 18, so that the microbial fuel cell can realize the function of automatic slag discharge; and the anode plate 2 is also provided with an anode plate stud preformed hole 20 for the locking piece 11 to pass through and lock.

The method specifically comprises the following steps: the anode plate liquid outlet 16 and the anode plate reference electrode socket 17 are tangent at the first accommodating cavity 19 and are connected with the upper end of the first accommodating cavity 19, and the anode plate liquid inlet 15 and the anode plate slag discharge port 18 are respectively connected with the bottom end of the first accommodating cavity 19;

wherein the opening position of the liquid outlet 16 of the anode plate is 2-4 mm higher than the opening position of the slag discharge port 18 of the anode plate.

At present, most MFC microbial fuel cells design the cross section of a reaction cavity to be circular, and the design has the following defects: the residual air at the top end is particularly not favorable for the anaerobic condition which the anode 3 needs to keep, especially for the operation in a continuous flow mode, an air layer with larger volume can be formed at the upper part of the water outlet, and the residual air is not favorable for the survival of the electrogenesis microorganisms of the anode 3 and is difficult to ensure the accuracy of the volume of the anode 3 chamber. The anode plate liquid outlet 16 of the embodiment adopts a high open-pore design, namely the anode plate liquid outlet 16 is tangent to the inner hole of the anode plate reference electrode socket 17, so that air residue between the anode plate liquid outlet 16 and the anode plate reference electrode socket 17 can be avoided to the greatest extent, and the anaerobic environment of the anode chamber is ensured.

In this embodiment, the bottom of the anode plate 2 is designed with an automatic slag discharge port, which can realize automatic slag discharge and avoid the influence of impurities formed by reaction on the discharge performance of the MFC.

The anode plate slag discharge port 18 is not connected with the anode plate liquid outlet 16, the opening position of the anode plate liquid outlet 16 is higher than the anode plate slag discharge port 18, the height difference of the embodiment can be set to be 2-4 mm, the design is based on hydromechanics, when liquid enters the first accommodating cavity 19 from the anode plate liquid inlet 15, the liquid is firstly blocked by the inclined plane of the first accommodating cavity 19, the flow rate of part of liquid is reduced, impurities with high density are gradually difficult to be pushed by water flow, and the liquid slowly sinks under the action of gravity. When the water in the lower part is disturbed and drives impurities in the water to rise, the inclined surface at the upper part of the first accommodating cavity 19 can prevent the impurities from further rising, so that the impurities are forced to precipitate towards the bottom under the action of gravity and are timely discharged through the anode plate slag discharge port 18.

In some embodiments of the present application, further comprising:

a third sealing gasket 9, two side surfaces of which are respectively attached to the front end plate 1 and the anode plate 2, and which is provided with a fourth accommodating cavity, wherein the fourth accommodating cavity is provided with a first opening communicated with the outside;

an anode lead 71 provided in the fourth receiving chamber and the first opening, and extending outward from the first opening;

a fourth sealing gasket 30, two side surfaces of which are respectively attached to the cathode 5 and the rear end plate 6, and which has a fifth accommodating cavity having a second opening communicating with the outside;

and a cathode guide 72 disposed in the fifth receiving cavity and the second opening, and extending outward from the second opening.

The anode lead 71 and the cathode lead 72 are both metal leads, preferably titanium sheet metal leads.

The third gasket 9 can function both as an assembly of the anode lead 71 and as a seal, and the fourth gasket 30 is the same;

the anode lead 71 and the cathode lead 72 are respectively connected with two ends of an external load resistor through leads to form a closed loop, output voltage is automatically recorded into a computer (5 min/time) through a data acquisition instrument (Keysight 34970A, Keysight observations Inc USA) for testing, and the data of the reaction efficiency and the cell performance of the microbial fuel cell can be obtained.

In some embodiments of the present application, further comprising:

the cathode plate 13 is positioned between the rear end plate 6 and the cathode 5 and is provided with a sixth accommodating cavity 25;

and the cathode current collector 14 is positioned in the sixth accommodating cavity 25, and the end part of the cathode current collector is tightly attached to the cathode 5.

In the embodiment, the single-chamber microbial fuel cell is adopted, and in the embodiment, the cathode plate 13 has a sixth accommodating cavity 25, the first accommodating cavity is an anode 3 cavity, and the sixth accommodating cavity 25 is a cathode 5 cavity, so that a dual-chamber microbial fuel cell is formed. Wherein the cathode current collector 14 is placed in the sixth receiving cavity 25 and is attached to the cathode 5, and the cathode lead is attached to the cathode current collector 14 at the other side; the single-chamber microbial battery is characterized in that a through hole is formed in the middle of the rear end plate, the through hole can be square with a round angle, and the through hole is used for oxygen to contact with the cathode; in the double-chamber microbial cell, the rear end plate 6 does not need to be provided with a through hole.

In the embodiment of the present application, the structure of the cathode plate 13 is the same as that of the anode plate 2, the thickness of the anode plate 2 is greater than that of the cathode plate 13, and the cross sections of the first accommodating cavity 19 and the sixth accommodating cavity 25 are both square with rounded corners.

The cross sections of the first accommodating cavity 19 and the sixth accommodating cavity 25 of the embodiment are both rounded squares, so that the technical problems that a round opening is difficult to process and an electrode is difficult to match are solved, the technical effects of reducing the processing difficulty and the manufacturing cost of the microbial fuel cell are achieved, and the preparation efficiency of the electrode material and the sealing gasket is improved.

The structure of the cathode plate 13 is the same as that of the anode plate 2, and the cathode plate 13 comprises a cathode plate liquid inlet 21, a cathode plate liquid outlet 22, a cathode plate reference electrode socket 23, a cathode plate slag discharge port 24, a sixth accommodating cavity 25 and a cathode plate screw rod preformed hole 26. When the cathode plate 13 is in operation, catholyte enters from the cathode plate liquid inlet 21, passes through the sixth accommodating chamber 25, and then flows out from the cathode plate liquid outlet 22; in contrast to the operation of the anode plate 2, the cathode plate 13 can be supplied with not only liquid but also optionally moist air during operation.

In order to improve the sealing performance of the microbial fuel cell, a fifth sealing gasket 40 may be further disposed between the anode plate 2 and the anode 3, and the fifth sealing gasket 40 has a seventh receiving cavity for the anode current collector 8 on the anode plate 2 to pass through and contact with the anode 3; the tightness between the anode plate 2 and the anode 3 can be effectively enhanced by the fifth sealing gasket 40;

a sixth sealing gasket 50 is arranged between the cathode plate 13 and the cathode 5, and an eighth accommodating cavity is formed in the sixth sealing gasket 50 and is used for allowing the cathode current collector 14 on the cathode plate 13 to penetrate through to be in contact with the cathode 5; the sealability between the cathode plate 13 and the cathode 5 can be effectively enhanced by the sixth sealing gasket 50;

in some embodiments of the present application, the cathode 5 current collector and the anode 3 current collector are both graphite plates.

The graphite plate is used as a current collector, is arranged in the cavity of the anode plate 2 or the cathode plate 13 and is tightly attached to the anode 3 or the cathode 5, and can play a role in fixing the anode 3 or the cathode 5; meanwhile, the graphite has high conductivity and good biocompatibility, and can be used as a current collector to reduce the internal resistance of the microbial fuel cell and also can be used as an extension of the anode 3 to further improve the attachment amount of microorganisms;

in the embodiment of the present application, one surface of the graphite plate has at least two ridges 81 extending outward, a groove 82 is formed between adjacent ridges 81, and the end of the ridge 81 is tightly attached to the cathode 5 or the anode 3;

the groove 82 is used for flowing reaction liquid; through the structure of the ridge 81 and the groove 82, the anolyte or the catholyte can be well and uniformly mixed, the mass transfer efficiency is improved, and the performance of the microbial fuel cell is further improved.

Specifically, the value range of the aperture ratio of the flow field of the ridge 81 and the groove 82 is 40% -70%; the ratio of the width of the groove 82 to the width of the ridge 81 ranges from 1: 1.2 to 2.0.

The aperture ratio of the ridge 81 and the flow field of the groove 82 is the ratio of the area of the groove 82 part to the area of the ridge 81;

the linear velocity of the reaction solution flowing through the flow field can be reduced due to the excessively high aperture ratio, the contact area with the electrode is reduced, and the contact resistance is increased; too low aperture ratio will cause the ridges 81 to occupy more electrode surface, resulting in too low electrode reaction area and affecting the performance of the microbial fuel cell; therefore, in this embodiment, the aperture ratio of the flow field of the ridge 81 and the groove 82 is in a range of 40% to 70%; the depth of the grooves 82 should be determined by both the overall length of the grooves 82 and the pressure drop allowed for the flow of the reactant fluid through the flow field. The addition of current collectors within the electrode chamber necessarily results in a reduction in the volume of the electrode chamber, and therefore, electrode chamber volume control is also necessary.

Example one:

1. the cross-sectional area of the first accommodating chamber 19 is: s (total) is 40mm multiplied by 40mm 1600mm2,

the height of the first housing chamber 19 is 15mm,

the volume of the first accommodating cavity 19 is set to V (total) × H1600 × 15 24000mm 3;

2. a dot-shaped flow field is adopted, the cross section of the ridge 81 is square, and the width of the ridge 81 is 2 mm;

the ridge 81 cross-sectional area can be calculated: 2mm 4mm 2;

3. the depth of the groove 82 is h (groove 82) ═ 10mm, and the width of the groove 82 is: 1.0 mm;

then it can be obtained: the height h (base) of the current collector base is 5 mm;

4. a "16 x 16" dot array, calculated from the cross-sectional area of ridge 81 in 2:

the area of the ridge 81 is S (ridge) ═ 16 × 16 × 4 ═ 1024mm 2; further calculation:

the partial area S (groove 82) of the groove 82 is S (total) -S (ridge) 1600-1024mm 2-576 mm 2;

then, the opening ratio is S (groove 82)/S (ridge) 576/1024 is 56.25%.

5. The volume occupied by the ridge 81 is V (ridge) ═ 1024 × 10mm3 ═ 10240mm 3;

the volume occupied by the base is V (base) 5 x 1600mm3 8000mm 3.

6. The electrode used by the anode 3 is a carbon felt, the porosity is as high as 90-95%, and if the volume occupied by the carbon felt is neglected, the remaining volume of the first accommodating cavity 19 is as follows:

v (total) -V (ridge) -V (base) ═ 24000 and 10240 and 8000mm3 and 5769mm3, which account for 24.0% of the total volume of the chamber.

Example 2:

1. the cross-sectional area of the first accommodating space is as follows: s (total) is 40mm multiplied by 40mm 1600mm2,

the height of the first accommodating space is 15mm,

the volume of the first accommodating space is set as V ═ S (total) × H ═ 1600 × 15 ═ 24000mm 3;

2. by adopting a dot-shaped flow field, the cross section of the ridge 81 is in an inverted square shape, and the width of the ridge 81 is 2 mm;

the ridge 81 cross-sectional area can be calculated: s (ridge) ═ 2mm × 2mm ═ 4mm 2;

3. the depth of the groove 82 is h (groove 82) ═ 10mm, and the width of the groove 82 is: 1.4 mm;

4. an "11 × 11" dot array, calculated from the cross-sectional area of ridge 81 in fig. 2:

the area of the ridge 81 is S (ridge) ═ 11 × 11 × 4 ═ 484mm 2;

further calculation:

the partial area S (groove 82) of the groove 82 is S (total) -S (ridge) 1600-484mm 2-1116 mm 2;

then, the opening ratio is S (groove 82)/S (ridge) 1116/484 is 230.58%.

5. The volume occupied by the ridge 81 is V (ridge) ═ 484 × 10mm3 ═ 4840mm 3;

the volume occupied by the base is V (base) 5 x 1600mm3 8000mm 3.

6. The electrode used in the anode 3 is a carbon felt, the porosity is as high as 90-95%, and if the volume occupied by the carbon felt is neglected, the remaining volume of the first accommodating space is as follows after the graphite current collector is added:

v (total) -V (ridge) -V (base) ═ 24000-.

Example three:

1. the cross-sectional area of the first accommodation chamber 19 is: s (total) is 40mm multiplied by 40mm 1600mm2,

the height of the first housing chamber 19 is 15mm,

2. by adopting a dot-shaped flow field, the cross section of the ridge 81 is square, and the width of the ridge is 4 mm;

the ridge 81 cross-sectional area can be calculated: s (ridge) ═ 4mm × 4mm ═ 16mm 2;

3. the width of the groove 82 is: 3 mm; the height h (base) of the current collector base is 5 mm;

4. the depth of the groove 82 (i.e., the height of the ridge) is designed to be two, wherein the height of the peripheral ridge is designed to be h (groove 82) ═ 10mm, including two turns; the height of the inner ridge is designed to be h (groove 82) ═ 5 mm;

5. an "8 x 8" dot array, calculated from the cross-sectional area of ridge 81 in 2:

the area of the ridge 81 is S (ridge) ═ 8 × 8 × 16 ═ 1024mm 2;

further calculation:

then, the opening ratio is S (groove 82)/S (ridge) 576/1024 is 56.25%.

6. The volume occupied by the ridge 81 is V (ridge) ═ 48 × 4 × 4 × 10) + (16 × 4 × 4 × 5) mm3 ═ 8960mm 3;

the volume occupied by the base is V (base) 5 x 1600mm3 8000mm 3.

7. The electrode used by the anode 3 is a carbon felt, the porosity is as high as 90-95%, and if the volume occupied by the carbon felt is neglected, the remaining volume of the first accommodating cavity 19 is as follows:

v (remaining) -V (ridge) -V (base) -24000-8960-8000-mm 3-7040-mm 3, accounting for 29.3% of the total volume of the chamber.

In this example, the height of the inner ridge 81 is lower than the height of the outer ridge 81, so that the anode 3 carbon felt can be embedded in the graphite current collector, the carbon felt and the graphite can be ensured to be in close contact to the maximum extent without using external force, but the cross-sectional area of the anode 3 carbon felt is relatively reduced, and the adhesion amount of microorganisms in the anode 3 carbon felt can be expected to be ensured by increasing the thickness of the carbon felt;

meanwhile, another benefit of the design is that the carbon felt can be ensured to be utilized by microorganisms on the side contacting with the proton exchange membrane 4 on the premise of ensuring that the distance between the carbon felt and the proton exchange membrane 4 is small enough.

In some embodiments of the present application, the front end plate 1, the cathode plate 13, the anode plate 2 and the rear end plate 6 are made of organic glass material.

Through the organic glass material makes front end plate 1 the negative plate 13 positive plate 2 and back end plate 6 can solve glass processing difficulty, polytetrafluoroethylene is with high costs and general plastics poor technical problem of corrosion resistance effectively, has realized having high acid and alkali corrosion resistance concurrently, low processing degree of difficulty and low manufacturing cost etc. technical effect.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A microbial fuel cell, comprising:

a front end plate;

an anode current collector disposed proximate the front end plate;

the second sealing gasket is positioned on one side of the proton exchange membrane, which is far away from the first sealing gasket, clings to the proton exchange membrane and is provided with a third accommodating cavity;

the anode current collector is a graphite plate, and the front end plate, the anode plate, the first sealing gasket, the second sealing gasket and the rear end plate are sequentially connected together.

2. The microbial fuel cell of claim 1, wherein the anode plate comprises:

and

3. The microbial fuel cell of claim 2, wherein the anode plate liquid outlet is tangent to the anode plate reference electrode socket at the first accommodating cavity and is connected with the upper end of the first accommodating cavity, the anode plate liquid inlet and the anode plate slag discharge port are respectively connected with the bottom end of the first accommodating cavity,

wherein the opening position of the liquid outlet of the anode plate is 2-4 mm higher than the opening position of the slag discharge port of the anode plate.

4. The microbial fuel cell according to claim 3, further comprising:

the two side surfaces of the third sealing gasket are respectively attached to the front end plate and the anode plate, and the third sealing gasket is provided with a fourth accommodating cavity which is provided with a first opening communicated with the outside;

the anode guide piece is arranged on the fourth accommodating cavity and the first opening part and extends outwards from the first opening part;

the two side surfaces of the fourth sealing gasket are respectively attached to the cathode and the rear end plate, and the fourth sealing gasket is provided with a fifth accommodating cavity which is provided with a second opening communicated with the outside;

and the cathode guide piece is arranged on the fifth accommodating cavity and the second opening part and extends outwards from the second opening part.

5. The microbial fuel cell according to claim 1, further comprising:

the negative plate is positioned between the rear end plate and the cathode and is provided with a sixth accommodating cavity;

and the cathode current collector is positioned in the sixth accommodating cavity, and the end part of the cathode current collector is tightly attached to the cathode.

6. The microbial fuel cell of claim 5, wherein the structure of the cathode plate is the same as that of the anode plate, the thickness of the anode plate is greater than that of the cathode plate, and the cross sections of the first accommodating cavity and the sixth accommodating cavity are both square with rounded corners.

7. The microbial fuel cell of claim 5, wherein the cathode current collector and the anode current collector are the same and are also graphite plates.

8. The microbial fuel cell of claim 7, wherein one surface of the graphite plate has at least two ridges extending outwardly to form channels between adjacent ridges, and ends of the ridges abut against the cathode or the anode.

9. The microbial fuel cell according to claim 8, wherein the aperture ratio of the flow field of the ridges and the grooves ranges from 40% to 70%; the ratio of the width of the groove to the width of the ridge ranges from 1: 1.2 to 2.0.

10. The microbial fuel cell of claim 7, wherein the front end plate, the cathode plate, the anode plate and the rear end plate are made of organic glass material.