CN110993983A - Single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell - Google Patents
Single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell Download PDFInfo
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- CN110993983A CN110993983A CN201911332248.7A CN201911332248A CN110993983A CN 110993983 A CN110993983 A CN 110993983A CN 201911332248 A CN201911332248 A CN 201911332248A CN 110993983 A CN110993983 A CN 110993983A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention discloses a single-channel wire-based hydrogen peroxide membraneless passive micro-fluid fuel cell, which comprises a cover plate, an anode electrode, a cathode electrode, a cotton wire flow channel and a support plate, wherein the cover plate is arranged on the cover plate; the method is characterized in that: the anode electrode and the cathode electrode are symmetrically arranged on the supporting plate from left to right, a gap is reserved between the anode electrode and the cathode electrode, and cotton thread flow channels are arranged on the anode electrode and the cathode electrode; the left part and the right part of the cotton thread flow channel are respectively overlapped with the cathode electrode and the anode electrode, and a certain height difference is arranged at the inlet and the outlet of the cotton thread flow channel; the cotton thread flow channel is a flow channel of fuel and electrolyte, the cotton thread flow channel conveys the fuel and the electrolyte to the surfaces of the anode electrode and the cathode electrode, the fuel adopts hydrogen peroxide, and the cotton thread flow channel is made of a plurality of hydrophilic cotton threads; the invention adopts single-stranded cotton threads as a flow channel, realizes passive transportation of fuel and oxidant by utilizing capillary force or the coupling of capillary force and gravity, and can be widely applied to the fields of chemical industry, energy, environmental protection and the like.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell.
Background
In recent years, with the development of science and technology and the improvement of the living standard of people, more and more mobile portable electronic products have come into the lives of people, and the electronic products have urgent requirements on a miniaturized power supply with high efficiency and high energy density. At present, common miniature portable mobile power sources include solar batteries, lithium batteries, miniature direct methanol fuel cells and the like. The solar cell is greatly influenced by the environment and weather and has low photoelectric conversion efficiency; the lithium battery has poor safety and high cost, and cannot realize continuous operation; the micro direct methanol fuel cell faces the problems of water management, easy poisoning of the catalyst, fuel permeation and the like.
To overcome the drawbacks of these power sources, researchers have proposed Membraneless Microfluidic Fuel Cells (MMFCs) in 2002. The fuel cell is based on the laminar flow effect, and can realize laminar flow of a plurality of strands of fluid in the micro-channel, thereby separating the cathode and the anode, removing a proton exchange membrane and avoiding a series of problems caused by the membrane. The battery has the advantages of simple structure, high energy density, easy integration, quiet running and the like, thereby causing wide attention and research of numerous scholars. However, the conventional membraneless microfluidic fuel cell has an external syringe pump to maintain laminar flow of anolyte and catholyte in the microchannel, which not only increases additional energy consumption of the system, but also facilitates portability and miniaturization of the cell.
Researchers have looked at porous and hydrophilic materials, paper, in recent years because passive transport of liquid over the paper by capillary forces when the paper is used as a flow channel has eliminated the need for a pump. In 2014, Esquirel et al proposed a paper-based membraneless microfluidic fuel cell for the first time,when methanol is used as fuel and oxygen in air is used as oxidant, the maximum power density can reach 4.4mW cm-2. However, the mechanical properties of the paper are deteriorated, the durability is deteriorated, and problems such as fuel leakage occur when the paper is soaked for a long time. Cotton thread is a common material in life, has low cost, has stronger mechanical property than paper besides the porous and hydrophilic properties of paper, can be woven into any shape and any size by a machine or manually, and has higher flexibility. Thus, the wires can be used as channels for transporting liquids in a passive membraneless microfluidic fuel cell.
Disclosure of Invention
Aiming at the defects and improvement requirements of the existing structure, the technical problem to be solved by the invention is to provide a single-channel wire-based hydrogen peroxide membrane-free passive micro-fluid fuel cell.
The technical scheme of the invention is as follows: a single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell comprises a cover plate, an anode electrode, a cathode electrode, a cotton line flow channel and a support plate; the method is characterized in that: the anode electrode and the cathode electrode are symmetrically arranged on the supporting plate from left to right, a gap is reserved between the anode electrode and the cathode electrode, and cotton thread flow channels are arranged on the anode electrode and the cathode electrode; the left part and the right part of the cotton thread flow channel are respectively overlapped with the cathode electrode and the anode electrode, and a certain height difference is arranged at the inlet and the outlet of the cotton thread flow channel; the cotton thread flow channel is a flow channel of fuel and electrolyte, the fuel and the electrolyte are conveyed to the surfaces of the anode electrode and the cathode electrode by the cotton thread flow channel, the fuel adopts hydrogen peroxide, and the cotton thread flow channel is made of a plurality of hydrophilic cotton threads.
The invention adopts cotton threads as a flow passage, and utilizes the capillary force or the coupling action of the capillary force and the gravity to realize the passive delivery of the fuel and the electrolyte, thereby removing an injection pump, not only reducing the extra energy consumption, but also being more beneficial to portability and integration; the cathode and anode catalyst pair H prepared by the invention2O2Has selective catalytic performance, so that the fuel and the oxidant in the fuel cell provided by the invention both adopt H2O2(ii) a H used in the present invention2O2The catalyst is a carbon-free energy carrier, and the product after reaction is water and oxygen, so that the catalyst is harmless to the environment; the fuel cell structure provided by the invention can realize the operation of a single-stranded flow channel, and the cell structure is greatly simplified.
According to the preferable scheme of the single-channel wire-based hydrogen peroxide membraneless passive micro-fluid fuel cell, the anode electrode is a metal electrode made of nickel, aluminum and the like. .
According to the preferable scheme of the single-channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell, the cathode electrode adopts a conductive substrate such as carbon cloth, carbon paper and carbon felt, and the prepared catalyst PB + MWCNT is deposited on the surface of the conductive substrate such as the carbon cloth, the carbon paper and the carbon felt in a dipping or spraying mode.
According to the preferable scheme of the single-channel wire-based hydrogen peroxide membrane-free passive micro-fluid fuel cell, the cover plate and the support plate are both made of corrosion-resistant polymer or glass materials.
According to the preferable scheme of the single-channel wire-based hydrogen peroxide membrane-free passive micro-fluid fuel cell, the bottom of the cover plate is provided with the groove, and the groove is arranged corresponding to the cotton thread flow channel, so that the cotton thread flow channel is prevented from being pressed by the upper cover plate to influence the liquid flow.
The single-channel line-based hydrogen peroxide membraneless passive microfluidic fuel cell has the beneficial effects that: the single-stranded cotton thread is used as a flow channel, the fuel and the oxidant are passively transported by utilizing the capillary force coupled with the gravity action, the dependence of the traditional microfluid fuel cell on an injection pump is removed, the extra energy consumption is reduced for the whole system, and the portable and integrated micro-fluidic fuel cell is more beneficial to portability and integration; the fuel and oxidant in the fuel cell provided by the invention both adopt H2O2The single-flow-channel operation can be realized for the whole fuel cell, and compared with the traditional microfluid fuel cell, the structure of the cell is greatly simplified; h used in the present invention2O2The catalyst is a carbon-free energy carrier, and the product after reaction is water and oxygen, so that the catalyst is harmless to the environment; the structure of the inventionSimple, easy to integrate, portable, convenient to operate, low in cost, not only can be used as a mobile portable micro power supply, but also can be used as an H2O2The electrochemical sensor has wide application prospect; can be widely applied in the fields of chemical industry, energy, environmental protection and the like.
Drawings
Fig. 1 is a schematic structural diagram of a single-channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell according to the present invention.
Fig. 2 is a schematic exploded view of a single channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell according to the present invention.
Fig. 3 is a diagram of the performance of a single channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell according to the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and specific embodiments. However, it should be noted that the present invention is not limited to the following embodiments.
Referring to fig. 1 to 2, a single-channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell is composed of a bolt 1, a cover plate 2, an anode electrode 4, a cathode electrode 5, a cotton wire flow channel 6, a support plate 3 and a nut 7; the anode electrode 4 and the cathode electrode 5 are symmetrically arranged on the supporting plate 3 according to the left and right, a gap is reserved between the anode electrode 4 and the cathode electrode 5, and a cotton thread flow channel 6 is arranged on the anode electrode 4 and the cathode electrode 5; the left part and the right part of the cotton thread flow channel 6 are respectively overlapped with the cathode electrode 5 and the anode electrode 4, and a certain height difference, such as 2-5 cm, is arranged at the inlet and the outlet of the cotton thread flow channel 6; the cotton thread flow passage 6 is a flow passage of fuel and electrolyte, the cotton thread flow passage 6 conveys the fuel and the electrolyte to the surfaces of the anode electrode 4 and the cathode electrode 5, the fuel adopts hydrogen peroxide, and the hydrogen peroxide is used as the fuel and also used as an oxidant. The electrolyte can be alkaline electrolyte or acidic electrolyte, such as dilute HCl, sulfuric acid, potassium hydroxide, etc. The cotton thread flow passage 6 is made of a plurality of hydrophilic cotton threads.
In a specific embodiment, the anode electrode 4 is made ofAnd cleaning the metal electrode such as nickel, aluminum and the like by using acetone, such as a nickel net or a nickel sheet. The cathode electrode 5 adopts a conductive substrate such as carbon cloth, carbon paper, carbon felt and the like, and the prepared catalyst PB + MWCNT is deposited on the surface of the conductive substrate such as carbon cloth, carbon paper, carbon felt and the like in a dipping or spraying mode, and the part of the carbon cloth not loaded with the catalyst is used as a current collector. The preparation method of the catalyst PB + MWCNT comprises the following steps: a quantity of Multi-walled carbon nano-Multi-walled carbon nanotube, MWCNT was first dispersed into 0.1M HCl and agitated by sonication to form a suspension slurry, and then a quantity of 0.5M K was added3[Fe(CN)6]+0.1M HCl was added to the suspension slurry with constant stirring, followed by an additional amount of 0.5M FeCl3+0.1M HCl, ensuring the mass ratio MWCNT to PB is 1: and 2, finally obtaining mixed slurry of Prussian Blue (PB) and MWCNT, and repeatedly filtering and washing to obtain the PB + MWCNT catalyst. The gap between the anode electrode 4 and the cathode electrode 5 is set to about 1 mm. The cotton thread flow passage 6 adopts about 30 cotton threads in the medical gauze.
The cover plate 2 and the support plate 3 are both made of corrosion-resistant polymer or glass. The microfluid fuel cell is fixed by a bolt 1 and a nut 7
The bottom of the cover plate 2 is provided with a groove 8, and the groove 8 is arranged corresponding to the cotton thread flow passage 6.
The invention adopts single-stranded cotton threads as a flow channel, and under the action of capillary force and the assistance of gravity, fuel and electrolyte are passively conveyed to the surfaces of the cathode and the anode through the cotton thread flow channel, and are respectively reduced and oxidized to generate current, so that the whole battery realizes pump-free driving operation.
Referring to FIG. 3, FIG. 3 shows the fuel and oxidizer used at 0.5M H2O2When the supporting electrolyte is 0.1M HCl, the open-circuit voltage of the battery can reach 0.67V, and the maximum current density and the maximum power density are respectively 36.93mA/cm2And 5.63mW/cm2。
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A single-channel wire-based hydrogen peroxide membraneless passive micro-fluid fuel cell comprises a cover plate (2), an anode electrode (4), a cathode electrode (5), a cotton wire flow channel (6) and a support plate (3); the method is characterized in that: the anode electrode (4) and the cathode electrode (5) are symmetrically arranged on the support plate (3) in a left-right mode, a gap is reserved between the anode electrode (4) and the cathode electrode (5), and a cotton thread flow channel (6) is arranged on the anode electrode (4) and the cathode electrode (5); the left part and the right part of the cotton thread flow passage (6) are respectively overlapped with the cathode electrode (5) and the anode electrode (4), and a certain height difference is arranged at the inlet and the outlet of the cotton thread flow passage (6); the cotton thread flow channel (6) is a flow channel of fuel and electrolyte, the fuel and the electrolyte are conveyed to the surfaces of the anode electrode (4) and the cathode electrode (5) by the cotton thread flow channel (6), the fuel adopts hydrogen peroxide, and the cotton thread flow channel (6) is made of a plurality of hydrophilic cotton threads.
2. The single channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell of claim 1, wherein: the anode electrode (4) is a metal electrode.
3. The single channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell of claim 1, wherein: the cathode electrode (5) adopts a conductive substrate, and the prepared catalyst is deposited on the surface of the conductive substrate in a dipping or spraying mode.
4. The single channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell of claim 1, wherein: the cover plate (2) and the support plate (3) are both made of corrosion-resistant polymer or glass.
5. The single channel wire-based hydrogen peroxide membraneless passive microfluidic fuel cell of claim 1, wherein: the bottom of the cover plate (2) is provided with a groove (8), and the groove is arranged corresponding to the cotton thread flow channel (6).
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| CN201911332248.7A CN110993983B (en) | 2019-12-22 | 2019-12-22 | Single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell |
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| CN201911332248.7A CN110993983B (en) | 2019-12-22 | 2019-12-22 | Single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell |
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| CN110993983B CN110993983B (en) | 2021-06-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271300A (en) * | 2020-10-23 | 2021-01-26 | 重庆大学 | Full-flexible direct microfluid fuel cell based on woven fibers |
| CN112531182A (en) * | 2020-12-05 | 2021-03-19 | 重庆大学 | Portable cylindrical membraneless fuel cell with large reaction volume ratio |
| CN113289701A (en) * | 2021-05-21 | 2021-08-24 | 合肥工业大学 | Pump-free micro-fluidic chip for electrochemical detection and preparation method thereof |
| CN114156499A (en) * | 2021-10-12 | 2022-03-08 | 天津大学 | Paper-based microfluid fuel cell embedded with cotton wires |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271300A (en) * | 2020-10-23 | 2021-01-26 | 重庆大学 | Full-flexible direct microfluid fuel cell based on woven fibers |
| CN112271300B (en) * | 2020-10-23 | 2022-09-23 | 重庆大学 | Full-flexible direct microfluid fuel cell based on woven fibers |
| CN112531182A (en) * | 2020-12-05 | 2021-03-19 | 重庆大学 | Portable cylindrical membraneless fuel cell with large reaction volume ratio |
| CN113289701A (en) * | 2021-05-21 | 2021-08-24 | 合肥工业大学 | Pump-free micro-fluidic chip for electrochemical detection and preparation method thereof |
| CN114156499A (en) * | 2021-10-12 | 2022-03-08 | 天津大学 | Paper-based microfluid fuel cell embedded with cotton wires |
| CN114156499B (en) * | 2021-10-12 | 2023-06-23 | 天津大学 | Paper-based micro-fluid fuel cell embedded with cotton thread |
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