CN109860651B - High-performance radial microfluid fuel cell - Google Patents
High-performance radial microfluid fuel cell Download PDFInfo
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- CN109860651B CN109860651B CN201910072226.5A CN201910072226A CN109860651B CN 109860651 B CN109860651 B CN 109860651B CN 201910072226 A CN201910072226 A CN 201910072226A CN 109860651 B CN109860651 B CN 109860651B
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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
Abstract
The invention discloses a high-performance radial microfluid fuel cell, which is formed by hot-pressing and packaging a partition plate and an upper cover plate and a lower cover plate which are covered on the partition plate, wherein two concave runners which are axially symmetrically distributed are arranged on the partition plate; electrode grooves are respectively arranged on the upper cover plate and the lower cover plate, porous electrodes are embedded in the electrode grooves, the porous electrodes are connected with an external circuit through metal wires, a through hole is formed in the center of the bottom of each electrode groove and serves as an electrode liquid inlet, and through holes are formed in the two sides of each electrode groove of the upper cover plate and serve as reaction liquid outlets; two concave flow channels surround the periphery of the porous electrode; the cell performance of the microfluid fuel cell is effectively improved through the radial flow of the reaction liquid in the porous electrode; the baffle plate with the concave flow channel is added between the cathode and the anode, so that the laminar flow interface of the anolyte and the catholyte is limited at the edge of the electrode of the porous electrode, the limitation of the laminar flow interface mixing area on the size of the microfluid fuel cell is greatly reduced, and the output power of a single cell can reach hundreds of milliwatts.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a high-performance radial microfluid fuel cell.
Background
The microfluid fuel cell is a novel fuel cell without using a proton exchange membrane, and utilizes the physical characteristic of low Reynolds number flowing in a microflow channel to ensure that anolyte and catholyte flow in parallel laminar flow in the same microflow channel and are less mixed. Compared with the traditional membrane fuel cell, the micro-fluid fuel cell reduces or eliminates the technical problems of water management, heat management and the like caused by the use of the membrane, has simple structure and low cost, and has good application prospect. However, it has been found that the anolyte-catholyte interface creates a mixing zone that contains both fuel and oxidant due to diffusion, and that the width of the mixing zone increases as the length of the microfluidic channel increases. When the length of the micro flow channel increases to a certain extent, the fuel or the oxide in the mixing region diffuses to the counter electrode, resulting in a drop in the cell voltage. Therefore, in order to avoid the influence of the mixing region on the cell performance, the size of the microfluidic fuel cell is usually limited, which also results in that the output power of each cell of the microfluidic fuel cell is usually low and cannot meet the practical requirements of the electronic device.
Disclosure of Invention
The invention provides a high-performance radial microfluid fuel cell, which is used for solving the problems that the size of the existing microfluid fuel cell is limited due to the existence of a mixing region, and the output power of a single cell is low.
A high-performance radial microfluid fuel cell is formed by hot-pressing and packaging a partition plate and an upper cover plate and a lower cover plate which are covered on the partition plate, and is characterized in that two concave runners which are axially symmetrically distributed are arranged on the partition plate;
electrode grooves are respectively arranged on the upper cover plate and the lower cover plate, porous electrodes are embedded in the electrode grooves, the porous electrodes are connected with an external circuit through metal wires, a through hole is formed in the center of the bottom of each electrode groove and serves as an electrode liquid inlet, and through holes are formed in the two sides of each electrode groove of the upper cover plate and serve as reaction liquid outlets;
the concave flow channel consists of a flat bottom and two side walls, and the side walls of the two concave flow channels are arranged close to each other; the concave flow channel is arranged on the periphery of the porous electrode, and the side wall and part of the flat bottom of the concave flow channel are overlapped with the porous electrode.
The upper cover plate is provided with a porous anode, the lower cover plate is provided with a porous cathode which are square, and the anolyte inlet and the catholyte inlet are both square.
Furthermore, the partition plate, the upper cover plate and the lower cover plate are made of PMMA, the thickness of the partition plate is 0.2-0.4 mm, and the thickness of the cover plate is 0.5-1 mm.
Furthermore, the size of the anode groove on the upper cover plate is the same as that of the cathode groove on the lower cover plate, the depth of the anode groove is 0.2-0.4 mm, and the length and the width of the anode groove are 0.5-2 cm; when the flow rate of the reaction solution is 300. mu.L/min, it is preferable that the length and width thereof be set to 1 cm.
Furthermore, the porous anode and the porous cathode are made of carbon paper, the size of the porous anode and the size of the porous cathode are matched with that of the anode groove and that of the cathode groove, the porous anode is embedded in the anode groove, and the porous cathode is embedded in the cathode groove.
Further, the anolyte is a sulfuric acid solution of divalent vanadium, and the catholyte is a sulfuric acid solution of pentavalent vanadium.
Furthermore, the distance between the concave flow channel and the edge of the porous electrode is 0.08-1.2 mm.
Furthermore, the anolyte inlet and the catholyte inlet are both square with the side length of 1-3 mm.
Furthermore, the outlet of the reaction solution is circular with the diameter of 0.5-1 mm.
Preferably, the thickness of the partition board is 0.3mm, and the thickness of the cover board is 1 mm; the anode groove and the cathode groove have the same size, the depth is 0.3mm, and the length and the width are 1cm when the flow rate of the reaction solution is 300 mu L/min; the flat bottom of the concave runner is overlapped with the porous electrode by 1 mm; the anolyte inlet and the catholyte inlet are both square with the side length of 2 mm; the outlet of the reaction solution was circular with a diameter of 1 mm.
Has the advantages that: the high-performance radial microfluid fuel cell provided by the invention effectively improves the cell performance of the microfluid fuel cell by the radial flow of the reaction liquid in the porous electrode; the baffle plate with the concave flow channel is added between the cathode and the anode, so that the laminar flow interface of the anolyte and the catholyte is limited at the edge of the electrode of the porous electrode, the limitation of the laminar flow interface mixing area on the size of the microfluid fuel cell is greatly reduced, and the output power of a single cell can reach hundreds of milliwatts.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram of the assembly mechanism of a high performance radial microfluidic fuel cell of the present invention;
FIG. 2 is a diagram of the operating mechanism of a high performance radial microfluidic fuel cell of the present invention;
FIG. 3 is a flow line profile of the internal flow field of a high performance radial microfluidic fuel cell of the present invention;
FIG. 4 is a graph of the concentration profile of anode fuel within a high performance radial microfluidic fuel cell of the present invention;
FIG. 5 shows the output performance of a high performance radial microfluidic fuel cell of the present invention, including polarization curves and fuel utilization, for different electrode sizes at a reactant flow rate of 300 μ L/min and a reactant concentration of 2M. In which fig. 5(a) is a polarization graph and fig. 5(b) is a fuel utilization map.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Examples
As shown in fig. 1, a high-performance radial microfluid fuel cell is formed by hot-pressing and packaging a separator 2 and an upper cover plate and a lower cover plate which are covered on the separator, wherein two concave flow channels 12 which are axially symmetrically distributed are arranged on the separator 2;
be equipped with positive pole recess 4 on the upper cover plate 1, square porous positive pole 5 is embedded in positive pole recess 4, porous positive pole 5 links to each other with external circuit through wire 6 department for the department of wire interface, open at the bottom center of positive pole recess 4 has square through hole as anolyte entry 7, open the both sides of positive pole recess 4 has circular through hole as the export 8 of reaction liquid, be equipped with negative pole recess 9 on the apron 3 down, square porous negative pole 10 is embedded in negative pole recess 9, porous negative pole 10 links to each other with external circuit through wire 6 department for the department of wire interface, open the bottom of negative pole recess 9 has square through hole as catholyte entry 11.
The porous anode and the porous cathode are made of carbon paper, the size of the porous anode and the size of the anode groove are matched with that of the cathode groove, the porous anode is embedded in the anode groove, and the porous cathode is embedded in the cathode groove.
The concave flow channel consists of a flat bottom and two side walls, and the side walls of the two concave flow channels are arranged close to each other; the concave flow channel is arranged on the periphery of the porous electrode, the side wall and part of the flat bottom of the concave flow channel are overlapped with the porous electrode, and the flat bottom of the concave flow channel is 1mm overlapped with the porous electrode; the partition plate, the upper cover plate and the lower cover plate are made of PMMA, the thickness of the partition plate is 0.3mm, and the thickness of the cover plate is 1 mm; the anode groove and the cathode groove have the same size, the depth is 0.3mm, and the length and the width are 1cm when the flow rate of the reaction solution is 300 mu L/min; the flat bottom of the concave runner is overlapped with the porous electrode by 1 mm; the anolyte inlet and the catholyte inlet are both square with the side length of 2 mm; the outlet of the reaction solution was circular with a diameter of 1 mm.
The anolyte is a sulfuric acid solution of divalent vanadium, and the catholyte is a sulfuric acid solution of pentavalent vanadium.
FIG. 2 further illustrates a diagram of the operating mechanism of the high performance radial microfluidic fuel cell of the present invention; FIG. 3 shows a streamline profile of the internal flow field of a high performance radial microfluidic fuel cell of the present invention; FIG. 4 shows a concentration profile of anode fuel within a high performance radial microfluidic fuel cell of the present invention; FIG. 5 shows the output performance of a high performance radial microfluidic fuel cell of the present invention, including polarization curves and fuel utilization, for different electrode sizes at a reactant flow rate of 300 μ L/min and a reactant concentration of 2M. In which fig. 5(a) is a polarization graph and fig. 5(b) is a fuel utilization map.
The high-performance radial microfluid fuel cell provided by the invention effectively improves the cell performance of the microfluid fuel cell by the radial flow of the reaction liquid in the porous electrode; the baffle plate with the concave flow channel is added between the cathode and the anode, so that the laminar flow interface of the anolyte and the catholyte is limited at the edge of the electrode of the porous electrode, the limitation of the laminar flow interface mixing area on the size of the microfluid fuel cell is greatly reduced, and the output power of a single cell is effectively improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-performance radial microfluid fuel cell is formed by hot-pressing and packaging a partition plate and an upper cover plate and a lower cover plate which are covered on the partition plate, and is characterized in that two concave runners which are axially symmetrically distributed are arranged on the partition plate;
electrode grooves are respectively arranged on the upper cover plate and the lower cover plate, porous electrodes are embedded in the electrode grooves, the porous electrodes are connected with an external circuit through metal wires, a through hole is formed in the center of the bottom of each electrode groove and serves as an electrode liquid inlet, and through holes are formed in the two sides of each electrode groove of the upper cover plate and serve as reaction liquid outlets;
the concave flow channel consists of a flat bottom and two side walls, and the side walls of the two concave flow channels are arranged close to each other; the concave flow channel is arranged on the periphery of the porous electrode, and the side wall and part of the flat bottom of the concave flow channel are overlapped with the porous electrode.
2. The high performance radial microfluidic fuel cell according to claim 1 wherein said upper cover plate has a porous anode thereon, said lower cover plate has a porous cathode thereon, said porous anode and said porous cathode are square, and said anolyte inlet and said catholyte inlet are square.
3. The high performance radial microfluidic fuel cell according to claim 1, wherein said spacer plate and both said upper and lower cover plates are made of PMMA, the thickness of the spacer plate is 0.2-0.4 mm, and the thickness of the cover plate is 0.5-1 mm.
4. The high performance radial microfluidic fuel cell according to claim 2 wherein the anode grooves on the upper cover plate are the same size as the cathode grooves on the lower cover plate, both 0.2 to 0.4mm in depth and both 0.5 to 2cm in length and width.
5. The high performance radial microfluidic fuel cell according to claim 2 wherein said porous anode and porous cathode materials are carbon paper sized to fit the anode recess and the cathode recess, the porous anode is embedded in the anode recess and the porous cathode is embedded in the cathode recess.
6. The high performance radial microfluidic fuel cell according to claim 2, wherein the anolyte is a sulfuric acid solution of divalent vanadium and the catholyte is a sulfuric acid solution of pentavalent vanadium.
7. The high performance radial microfluidic fuel cell according to claim 1 or 2 wherein said concave flow channels are 0.08-1.2 mm from the edge of the porous electrode.
8. The high-performance radial microfluidic fuel cell according to claim 2, wherein the anolyte inlet and the catholyte inlet are both square with a side length of 1-3 mm.
9. The high performance radial microfluidic fuel cell according to claim 1, wherein the outlet of the reaction solution is circular with a diameter of 0.5-1 mm.
10. A high performance radial microfluidic fuel cell according to claim 2 wherein the separator plate is 0.3mm thick and the cover plate is 1mm thick; the anode groove and the cathode groove have the same size, the depth is 0.3mm, and the length and the width are 1cm when the flow rate of the reaction solution is 300 mu L/min; the flat bottom of the concave flow channel is overlapped with the porous electrode by 1 mm; the anolyte inlet and the catholyte inlet are both square with the side length of 2 mm; the outlet of the reaction solution was circular with a diameter of 1 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910072226.5A CN109860651B (en) | 2019-01-25 | 2019-01-25 | High-performance radial microfluid fuel cell |
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| CN201910072226.5A CN109860651B (en) | 2019-01-25 | 2019-01-25 | High-performance radial microfluid fuel cell |
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| CN109860651A CN109860651A (en) | 2019-06-07 |
| CN109860651B true CN109860651B (en) | 2020-10-30 |
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| CN110534751B (en) * | 2019-09-04 | 2020-09-01 | 重庆大学 | Stack type passive paper-based micro-fluid fuel cell with oppositely arranged cathode and anode |
| CN112652842B (en) * | 2020-12-18 | 2024-01-26 | 武汉轻工大学 | Microfluidic photocatalytic fuel cell and preparation method and application thereof |
| CN114824362B (en) * | 2022-04-28 | 2023-12-19 | 常州工学院 | Porous electrode type microfluidic fuel cell with slit-type reactant delivery system |
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| US6960403B2 (en) * | 2002-09-30 | 2005-11-01 | The Regents Of The University Of California | Bonded polyimide fuel cell package and method thereof |
| CN103066311B (en) * | 2012-12-11 | 2014-11-26 | 华东理工大学 | Self-driven type micro-fluid membrane less fuel cell based on gravity effects |
| CN107195922B (en) * | 2017-05-08 | 2020-05-05 | 江苏理工学院 | Bendable microfluid membraneless fuel cell |
| CN108417855A (en) * | 2018-04-08 | 2018-08-17 | 江苏理工学院 | A kind of microfluid fuel cell with right-angled trapezium porous electrode |
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