CN114156499B - Paper-based micro-fluid fuel cell embedded with cotton thread - Google Patents
Paper-based micro-fluid fuel cell embedded with cotton thread Download PDFInfo
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- CN114156499B CN114156499B CN202111185033.4A CN202111185033A CN114156499B CN 114156499 B CN114156499 B CN 114156499B CN 202111185033 A CN202111185033 A CN 202111185033A CN 114156499 B CN114156499 B CN 114156499B
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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
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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
- H01M8/0289—Means for holding the electrolyte
- H01M8/0293—Matrices for immobilising electrolyte solutions
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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
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a paper-based micro-fluid fuel cell embedded with cotton threads, which comprises a fuel and oxidant runner with a Y-shaped structure designed by water-absorbing paper, a hydrophilic cotton thread arranged in the center of a combining section of two fluids of the fuel and the oxidant in the water-absorbing paper, the hydrophilic cotton thread embedded by the water-absorbing paper, and Na arranged in the cotton thread 2 SO 4 Solid powder. The carbon paper sprayed with the palladium/carbon catalyst is symmetrically arranged at two sides of a fuel and oxidant flow passage to serve as a cathode catalytic layer and an anode catalytic layer, and the carbon paper at two sides is fixed by adopting a fastening device. The absorption pad is fixed at the position of the waste liquid outlet of the fuel and oxidant mixing runner. The invention designs the water absorbing paper embedded with cotton threads as the anode and cathode flow channels, and the cotton threads in the middle of the flow channels can effectively isolate the permeation of electrolyte of the anode and the cathode, thereby avoiding the problem of cross mixing of fuel; na in cotton thread 2 SO 4 The dissolution can ensure the transverse transmission of the cathode electrolyte ions, and finally the effective improvement of the battery performance is realized. The key point is that the invention does not produce any pollution to the environment.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a paper-based micro-fluid fuel cell embedded with cotton threads.
Background
With the progress of technology, small portable devices such as mobile phones, notebooks, and microchips are continuously rising, and are developing toward low cost, multifunctional integration, and miniaturization. For example, the instant detection device such as wearable electronic equipment and glucometer can be used for monitoring or detecting human health indexes, and has wide market application prospect (CN 204514931U, CN 106529355A). The high integration of these small electronic devices requires that the power supply have higher current density, smaller volume, or flexibility. Current small portable power supply devices mainly include lithium ion batteries, fuel cells, and the like. Among them, lithium ion button cells are most common, but have small energy density, large discharge loss, easy failure after long-term storage, and easy damage to the environment when being discarded at will (CN 101924243A). Compared with the micro fuel cell, the micro fuel cell has the advantages of high power density, small environmental pollution and the like. Micro-channel-based micro fuel cells require micro pumps or other auxiliary equipment to drive, which increases energy consumption, results in low net output power density, is difficult to meet the energy supply requirements of micro equipment such as detection chips, and severely limits practical applications (CN 1947296 a).
The paper-based microfluidic fuel cell has wide application prospect in flexible electronic equipment or medical instant detection equipment, and is a hot spot and key point (CN 111916809A) of current research and development. The paper-based micro-fluid fuel cell can realize natural layering of fuel and oxidant through capillary attraction provided by paper-based materials, and simultaneously provides driving force for transportation of the fuel and the oxidant without a proton exchange membrane and a micropump, and has the advantages of simple structure, foldability and easy integration. However, the biggest problem of such fuel cells is that the cells rely on paper base only to realize laminar flow of fuel oxidant, and the cross mixing of fuel or oxidant is easily generated between the cathode and anode electrodes, thereby seriously affecting the performance of the cells.
Therefore, it is a key to further improve the performance of paper-based microfluidic fuel cells to develop a paper-based microfluidic fuel cell that avoids the fuel crossover problem.
Disclosure of Invention
In order to solve the problem of fuel crossover of a paper-based microfluidic fuel cell and not influence the ion transmission rate, the invention aims to provide a paper-based microfluidic fuel cell embedded with cotton threads.
The technical scheme of the paper-based micro-fluid fuel cell embedded with cotton wires is as follows: the battery includes water absorbing paper, hydrophilic cotton thread, carbon paper, fastening device, absorbing pad, fuel, oxidant, palladium/carbon catalyst, perfluorosulfonic acid membrane, isopropanol, and wire. The water absorbing paper is designed into Y-shaped fuel and oxidant flow passage, and hydrophilic cotton thread is set in the flow passageThe hydrophilic cotton thread is embedded in the water-absorbing paper at the central position of the combining section of the fuel and the oxidant in the water-absorbing paper, and Na is loaded in the cotton thread 2 SO 4 Solid powder. The carbon paper sprayed with the palladium/carbon catalyst is symmetrically arranged at two sides of a fuel and oxidant flow passage to serve as a cathode catalytic layer and an anode catalytic layer, and the carbon paper at two sides is fixed by adopting a fastening device. The absorption pad is fixed at the position of the waste liquid outlet of the fuel and oxidant mixing runner.
The hydrophilic cotton thread contains Na 2 SO 4 Solid powders that increase the lateral conductivity of ions when the cell is in operation; the absorption pad is designed at the position of the waste liquid outlet of the flow channel, can continuously provide capillary driving force for liquid in the battery and store the used liquid.
Contains Na 2 SO 4 The cotton thread structure of the solution effectively prevents the occurrence of cross mixing of fuel at the cathode electrode and the anode electrode, ensures that the flow of the fuel and the oxidant is more stable, and strengthens the performance of the battery.
According to the hydrophilic cotton thread preferred proposal provided by the invention, the hydrophilic cotton thread is soaked in Na 2 SO 4 Cotton thread after drying treatment.
According to the preferred proposal of the absorbent paper, na is added between two layers of absorbent paper 2 SO 4 The hydrophilic cotton thread is obtained by fixing the treated cotton thread in 2 wet paper sheets, dehydrating and drying.
The invention has the characteristics and the generated beneficial effects that:
(1) The invention designs the water absorbing paper embedded with cotton threads as the anode and cathode flow channels, and the cotton threads in the middle of the flow channels can effectively isolate the permeation of electrolyte of the anode and the cathode, thereby avoiding the problem of cross mixing of fuel; na in cotton thread 2 SO 4 The dissolution can ensure the transverse transmission of the cathode electrolyte ions, and finally the effective improvement of the battery performance is realized.
(2) The products in the anode reaction are common carbonate and water, so that the anode reaction has no influence on the environment; the product in the cathode reaction is water, so that the cathode reaction has no pollution and no influence on the environment.
(3) The paper-based micro-fluid fuel cell embedded with cotton threads has the advantages of simple structure, low material-obtaining cost and easy realization of large-scale production and manufacture.
Drawings
Fig. 1 is a schematic diagram of the principle and structure of a cotton-embedded paper-based microfluidic fuel cell.
Fig. 2 is a graph of the performance versus results of a paper-based microfluidic fuel cell of an embodiment of the present invention.
Detailed Description
For the purposes of promoting an understanding of the principles and practicing the invention, reference will now be made to the embodiments illustrated in the drawings and specific examples thereof will be described in connection with the accompanying drawings, with the understanding that the drawings illustrate, by way of non-limiting example, the embodiments of the invention.
A paper-based micro-fluidic fuel cell with embedded cotton wires, which comprises the following structural components (as shown in figure 1): the water-absorbing paper (1) is designed into a fuel and oxidant runner with a Y-shaped structure, a hydrophilic cotton thread (2) is arranged in the central position of a combination section of two fluids of fuel and oxidant in the water-absorbing paper, the water-absorbing paper embeds the hydrophilic cotton thread, and Na is loaded in the cotton thread 2 SO 4 Solid powders can increase the lateral conductivity of ions during operation of the cell. Carbon paper (3) sprayed with palladium/carbon (Pd/C) catalysts is symmetrically arranged at two sides of a fuel and oxidant runner to serve as a cathode catalytic layer and an anode catalytic layer, and the carbon paper at two sides is fixed by a fastening device (4). The absorption pad (5) is fixed at the position of the waste liquid outlet of the fuel and oxidant mixing runner. The absorbent pad can continuously provide capillary driving force for liquid in the battery and store the used liquid.
Na is added between two layers of absorbent paper 2 SO 4 Hydrophilic cotton threads of (2) are made of Na 2 SO 4 After the solution is soaked and dried, the solution contains Na 2 SO 4 Cotton threads of solid powder.
The carbon paper of the paper-based micro-fluid fuel cell is carbon paper with a surface sprayed with a palladium/carbon catalyst, a perfluorinated sulfonic acid membrane (Nafion) and a mixed solution of isopropanol, and can be used as a cathode and anode catalytic layer to catalyze fuel and oxidant to generate electrochemical reaction.
The fastening device can collect electric energy generated by electrochemical reaction in the carbon paper and transmit the electric energy to an external electric appliance through a lead while fixing the cathode carbon paper and the anode carbon paper.
As a specific example, the absorbent paper, the carbon paper and the absorbent pad are cut into the required shape and size, wherein the length and width of each material are respectively as follows: 6cm multiplied by 1cm of paper base; an absorbent pad of 1cm x 1cm; carbon paper 3mm×5mm.
The anode adopts KOH/CH 3 COOH mixed solution, cathode adopts H 2 O 2 /H 2 SO 4 The solution was mixed. The fuel and the oxidant flow simultaneously in the paper base in a spontaneous passive manner. The anode side fuel and the cathode side oxidant are transported to the catalytic layer; after passing through the reaction zone the liquid enters the absorbent pad 5.
The anode reaction loses electrons and generates CO 3 2- And H 2 O, the cathode obtains electrons to combine with hydrogen ions to generate H 2 O, carbonate and waste liquid are absorbed by the tail absorption pad. The chemical equation of the reaction is as follows:
anode:
and (3) cathode: h 2 O 2 +2H + +2e - ——→2H 2 O
Fig. 2 is a graph of paper-based microfluidic fuel cell performance versus embedded hydrophilic cotton wick absorbent paper and plain absorbent paper (non-embedded hydrophilic cotton wick). Under the same environmental condition, in the assembled paper-based micro-fluid fuel cell embedded with cotton thread water absorbing paper and common water absorbing paper, 2mol/L CH is introduced into the anode fuel inlet 3 COOH and 4mol/L KOH, and 2mol/L H of the cathode oxidant inlet is introduced 2 SO 4 Dilute solution and 1mol/LH 2 O 2 Then the two fuel cells were tested for performance, respectively, and experimental curves were obtained. As can be seen from fig. 2, the paper-based microfluidic fuel cell with embedded cotton has a maximum voltage increased by about 20%, a maximum current density increased by about one time, and a maximum power density increased by more than two times, compared to the paper-based microfluidic fuel cell without embedded hydrophilic cotton.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, and the above-described specific embodiments are merely illustrative, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.
Claims (5)
1. A paper-based microfluidic fuel cell embedded with cotton threads, comprising absorbent paper, hydrophilic cotton threads, carbon paper, fastening devices, absorbent pads, fuel, oxidant, palladium/carbon catalyst, perfluorosulfonic acid membrane, isopropanol, and wires, characterized in that: the water-absorbing paper (1) is designed into a fuel and oxidant runner with a Y-shaped structure, a hydrophilic cotton thread (2) is arranged in the central position of a combination section of two fluids of fuel and oxidant in the water-absorbing paper, the water-absorbing paper embeds the hydrophilic cotton thread, and Na is loaded in the cotton thread 2 SO 4 The solid powder is characterized in that carbon paper (3) sprayed with palladium/carbon catalyst is symmetrically arranged at two sides of a fuel and oxidant runner to serve as a cathode catalytic layer and an anode catalytic layer, the carbon paper at two sides is fixed by a fastening device (4), and an absorption pad (5) is fixed at the position of a waste liquid outlet of the fuel and oxidant mixed runner.
2. A paper-based microfluidic fuel cell embedding cotton threads as claimed in claim 1, wherein: the hydrophilic cotton thread is made of Na 2 SO 4 After the solution is soaked and dried, the solution contains Na 2 SO 4 Cotton threads of solid powder.
3. A paper-based microfluidic fuel cell embedding cotton threads according to claim 1 or 2, characterized in that: na is added between the two layers of the absorbent paper 2 SO 4 Hydrophilic cotton thread of (a).
4. A paper-based microfluidic fuel cell embedding cotton threads as claimed in claim 1, wherein: the carbon paper is dried by spraying a mixed solution of palladium/carbon catalyst, perfluorosulfonic acid film and isopropanol on the surface, and can be used as an anode and cathode catalytic layer to catalyze fuel and oxidant to generate electrochemical reaction.
5. A paper-based microfluidic fuel cell embedding cotton threads as claimed in claim 1, wherein: the fastening device can collect electric energy generated by electrochemical reaction in the carbon paper and transmit the electric energy to an external electric appliance through a lead while fixing the cathode carbon paper and the anode carbon paper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111185033.4A CN114156499B (en) | 2021-10-12 | 2021-10-12 | Paper-based micro-fluid fuel cell embedded with cotton thread |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111185033.4A CN114156499B (en) | 2021-10-12 | 2021-10-12 | Paper-based micro-fluid fuel cell embedded with cotton thread |
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| CN114156499A CN114156499A (en) | 2022-03-08 |
| CN114156499B true CN114156499B (en) | 2023-06-23 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107293764A (en) * | 2017-08-09 | 2017-10-24 | 重庆大学 | A kind of passive microfluid fuel cell based on cotton thread |
| CN110061259A (en) * | 2019-05-08 | 2019-07-26 | 重庆大学 | A kind of air-breathing paper base microfluid fuel cell of embedded anode |
| CN110534751A (en) * | 2019-09-04 | 2019-12-03 | 重庆大学 | Anode and cathode stacked passive type paper base microfluid fuel cell positioned opposite |
| CN110600751A (en) * | 2019-10-24 | 2019-12-20 | 重庆大学 | Direct formate microfluid fuel cell with cotton wire electrode |
| CN110993983A (en) * | 2019-12-22 | 2020-04-10 | 重庆大学 | Single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell |
| CN112751053A (en) * | 2019-10-30 | 2021-05-04 | 武汉轻工大学 | Flexible microfluid photoelectric fuel cell |
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2021
- 2021-10-12 CN CN202111185033.4A patent/CN114156499B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107293764A (en) * | 2017-08-09 | 2017-10-24 | 重庆大学 | A kind of passive microfluid fuel cell based on cotton thread |
| CN110061259A (en) * | 2019-05-08 | 2019-07-26 | 重庆大学 | A kind of air-breathing paper base microfluid fuel cell of embedded anode |
| CN110534751A (en) * | 2019-09-04 | 2019-12-03 | 重庆大学 | Anode and cathode stacked passive type paper base microfluid fuel cell positioned opposite |
| CN110600751A (en) * | 2019-10-24 | 2019-12-20 | 重庆大学 | Direct formate microfluid fuel cell with cotton wire electrode |
| CN112751053A (en) * | 2019-10-30 | 2021-05-04 | 武汉轻工大学 | Flexible microfluid photoelectric fuel cell |
| CN110993983A (en) * | 2019-12-22 | 2020-04-10 | 重庆大学 | Single-channel line-based hydrogen peroxide membraneless passive micro-fluid fuel cell |
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| CN114156499A (en) | 2022-03-08 |
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