CN109390604B - Micro-channel flow field plate and preparation method thereof - Google Patents

Micro-channel flow field plate and preparation method thereof Download PDF

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CN109390604B
CN109390604B CN201811449364.2A CN201811449364A CN109390604B CN 109390604 B CN109390604 B CN 109390604B CN 201811449364 A CN201811449364 A CN 201811449364A CN 109390604 B CN109390604 B CN 109390604B
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field plate
flow field
cathode
micro
anode
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CN109390604A (en
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袁伟
郑天翔
庄梓译
卢彪武
苏晓晴
李锦广
刘静怡
韩福昌
王祺
黄虹霖
陈晓敏
方国云
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South China University of Technology SCUT
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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
    • H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
    • H01M8/0256—Vias, i.e. connectors passing through the separator material
    • 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
    • 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
    • H01M8/1011—Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
    • 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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  • Engineering & Computer Science (AREA)
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  • General Chemical & Material Sciences (AREA)
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Abstract

The invention discloses a novel micro-channel flow field plate and a preparation method thereof, the novel micro-channel flow field plate comprises an anode flow field plate and a cathode flow field plate, wherein the surface of the cathode flow field plate is uniformly provided with cathode micro-channels which are communicated with an input hole and an output hole of the cathode flow field plate and have the rib width and the channel width of 0.5-1.5 mm, and the surface of the cathode micro-channels is provided with a hydrophobic layer; the surface of the anode flow field plate is provided with two main flow channels which are respectively communicated with an input hole and an output hole, regular triangular platform-shaped anode micro flow channels with gradually changed width and depth towards one end are uniformly arranged between the two main flow channels, and the surface of the anode micro flow channels is provided with a metal protective film. The invention not only relieves the condition that the anode product blocks the methanol transfer channel, but also effectively reduces the methanol penetration phenomenon as a methanol blocking structure, and realizes high-concentration methanol reaction. The cathode side micro-channel improves the feeding pressure of oxygen, accelerates the discharge of water, and realizes the effect of 'water reverse compensation' through hydrophobic surface treatment, thereby improving the comprehensive performance of the battery.

Description

Micro-channel flow field plate and preparation method thereof
Technical Field
The invention relates to the technical field of direct methanol fuel cells, in particular to a micro-channel flow field plate and a preparation method thereof.
Background
The electric energy generated by the fuel cell is directly converted from the chemical energy of the raw material, has the advantages of higher energy density, lower environmental pollution, and the like, and is more and more focused. Compared with the hydrogen fuel cell in the proton exchange membrane fuel cell, the direct methanol fuel cell which belongs to the same type uses methanol as the anode raw material, has good application prospect due to the characteristics of low working temperature (generally working at room temperature), high theoretical specific energy, convenient carrying, safe use and the like, and is considered as the most promising fuel cell for realizing marketization in industry.
However, many problems to be treated are also presented in the development and use of direct methanol fuel cells. On one hand, anode carbon dioxide is blocked and cathode water flooded, which belongs to the problem of product management, after the product is generated, the product enters the flow field through a divergent micro-channel, and a proper divergent and flow field structure is favorable for the product to be separated and discharged timely and effectively, otherwise, the distribution of reactants is influenced, even blocked completely, and the basic fuel supply cannot be provided for the electrochemical reaction, so that the cell performance is reduced, and even the operation is stopped. On the other hand, in terms of reactant management, the existence of methanol penetration is an important bottleneck for inhibiting the development of a direct methanol fuel cell, and the methanol penetration inevitably causes voltage loss due to the mixed potential generated by the direct reaction of the penetrated methanol with oxygen of a cathode, and simultaneously causes fuel loss.
In order to solve the problems, on one hand, the flow field plate structure is improved, the flow field plate structure is reasonably designed, and the alcohol resistance and the carbon dioxide emission capability of the product are improved. The conventional flow field plate structure has: the flow field plates have very limited improvement on alcohol resistance, and the research on adopting fiber mats as alcohol resistance layers of the methanol fuel cells improves the optimal concentration of methanol solution of the methanol fuel cells and has positive effects on improving the energy ratio of the cells. However, under high current operating conditions, a large amount of bubbles generated by the anode need to be removed through the fiber mat, which inevitably blocks the methanol transfer channel, so that the phenomenon of methanol starvation is easy to occur at the anode, and further improvement of the performance of the methanol fuel cell is limited.
On the other hand, the micro-preparation forming of the bipolar plate micro-channel starts with improving the power density so as to ensure the miniaturization of the PEMFC and the DMFE and simultaneously generate enough power. At present, the MEMS technology is the mainstream technology for preparing micro-fuel cell bipolar plate micro-channels, and by utilizing technologies such as photoetching, corrosion, sputtering, body/surface processing and the like in the MEMS, the micro-channels can be etched on a silicon wafer, and then a Pt layer, an Au layer and the like are prepared on the surface by utilizing a film preparation technology to collect current. Meanwhile, the micro-channel prepared by the MEMS technology is generally 300-500 mu m in width and 200-300 mu m in depth, and because the MEMS technology is derived from the microelectronic technology, ultra-clean environment is required, the technology is complex, main processing objects are limited on materials such as silicon, and the silicon belongs to brittle materials, is difficult to prepare a thin plate, is not beneficial to improving the volume ratio power and the mass ratio power, is also not beneficial to assembling a galvanic pile, and has lower conductivity and reduces the performance of a fuel cell.
The invention aims to provide a design and assembly method of a micro-channel flow field plate, aiming at the problems of too slow carbon dioxide discharge rate and insufficient technology of the existing micro-channel processing caused by difficult gas (carbon dioxide gas) liquid (methanol solution) diversion.
Disclosure of Invention
To effectively alleviate problems of anode gas blockage and cathode flooding, thereby improving the output performance of active fuel cells. The invention discloses a micro-channel flow field plate and a preparation method thereof. The invention relates to an anode flow field plate and a cathode flow field plate, wherein the anode flow field plate is provided with uniformly distributed triangular platform-type micro-channels, the cathode side is provided with wider parallel micro-channels which are beneficial to water transportation, and the cathode flow field plate is subjected to hydrophobic treatment.
The invention is realized by the following technical scheme:
the micro-channel flow field plate comprises an anode flow field plate and a cathode flow field plate which are provided with an input hole and an output hole, wherein the surface of the cathode flow field plate is uniformly provided with cathode micro-channels which are communicated with the input hole and the output hole, the rib width and the channel width are both 0.5-1.5 mm, and the surface of the cathode micro-channels is provided with a hydrophobic layer; the surface of the anode flow field plate is provided with two main runners which are respectively communicated with an input hole and an output hole, a regular triangular platform-shaped anode micro-runner with width and depth gradually changed towards one end is uniformly arranged between the two parallel main runners, and the surface of the anode micro-runner is provided with a metal protective film.
Further, the rib width and the narrowest part of the flow channel of the anode micro flow channel are 100 μm, and the widest part is 400 μm.
Further, two main runners respectively communicated with an input hole and an output hole of the cathode flow field plate are arranged on the surface of the cathode flow field plate in parallel, and the cathode micro runners are arranged between the two parallel main runners in a linear type in parallel;
or alternatively, the process may be performed,
the cathode micro-flow channel is connected in series into a snake shape, and the head end and the tail end of the cathode micro-flow channel are respectively communicated with the input hole and the output hole of the cathode flow field plate.
Further, the contact angle of the hydrophobic layer is more than 145 degrees.
Further, the material of the plated metal protective film is gold or nickel.
Further, the anode flow field plate and the cathode flow field plate are made of metal or graphite.
A method of making the microchannel flow field plate, comprising the steps of:
drilling and processing on a substrate to obtain input and output holes of combustion-supporting gas and oxidant, and processing a corresponding main flow channel;
clamping a multi-tooth cutter on a numerical control planer and tightly fixing a cutter holder, wherein the set planer processing parameters comprise a processing stroke, a cutting depth, a cutting speed, a cutting return start point and an increased depth after single cutting is finished;
starting a planing machine, and automatically stopping after cutting and forming to obtain an anode flow field plate and a cathode flow field plate;
electroplating a layer of metal protective film on the surface of the anode flow field plate; and performing hydrophobic composite functional surface treatment on the cathode flow field plate.
Further, the hydrophobic composite functional surface treatment on the cathode flow field plate specifically comprises the following steps:
a) The surface pretreatment of the flow field plate, namely polishing the planed cathode flow field plate under sand paper to remove surface scratches, pits and oxide layers so as to enable the two surfaces to be flat, and then carrying out ultrasonic cleaning by deionized water; sequentially immersing in 100-200 g/L KOH solution for alkaline washing for 15-45 s to remove greasy dirt and impurities on the surface of the material, then carrying out ultrasonic secondary washing by using deionized water, then carrying out acid washing by using 3-5wt% HCl solution for 10-40 s to remove a surface oxide layer, finally carrying out ultrasonic cleaning by using deionized water, and naturally air-drying;
b) Immersing the cathode flow field plate after cleaning and air drying in a surface deposition solution, depositing for 1-2h at room temperature, taking out after the reaction is finished, cleaning with deionized water, and air drying in air;
c) The sintering experimental equipment is a KBF16Q box-type atmosphere sintering furnace, the air-dried flow field plate is put into the furnace with protection gas protection, and the temperature is kept for 1-2h at 300-500 ℃, wherein the protection gas is argon or nitrogen;
d) And (3) a low surface energy solution modification process, namely immersing the cathode flow field plate subjected to sintering reinforcement in a surface modification solution for modification for 24-36 h, taking out after modification, cleaning with an acetone reagent, and then airing in air to obtain the hydrophobic surface.
Further, the surface deposition solution is 1.5 to 2.5mol/L NaOH and 0.1 to 0.5mo1/L K 2 S 2 O 8 Is a deionized water solution.
Further, the surface modification solution is 0.01-0.1 mol/L of stearic acid ethanol solution.
Compared with the prior art, the invention has the following main characteristics:
1. the flow channels of the traditional flow field plate are mostly in millimeter level, and the flow field plate of the application adopts micro-flow channels in sub-millimeter level, so that the pressure per unit area can be effectively improved, the fuel supply efficiency is increased, the overflow of bubbles is enhanced, and the homogenization of gas distribution is promoted.
2. The majority of traditional divergent flow field plates adopt a planar two-dimensional trapezoid divergent mode, the gas-liquid separation effect and the gas discharge effect are not obvious, the flow field plates of the device adopt three-dimensional regular triangular platform type divergent flow channels, three sides of the three-dimensional flow channels are of trapezoid structures, carbon dioxide of anode products is discharged through the divergent flow channels, and the situation that the performance of a battery is reduced due to the fact that methanol transmission channels are blocked by the anode products is effectively relieved.
3. The traditional flow field plate adopts the same form of cathode-anode flow field plate, and in order to achieve the best effect, the invention adopts different treatment modes for the anode and cathode flow field plates, namely micro-channel flow field plates, but combines the difference of cathode water management and anode gas management, and designs different flow channel width and rib width forms, thereby improving the comprehensive performance of the battery.
4. Unlike traditional flow field plate, the present invention has some surface hydrophobic treatment to the cathode to realize the water reverse replenishing effect and speed up the water discharge and reverse anode replenishing.
5. Unlike traditional flow field plate producing process, the anode-cathode flow field plate is produced through numerical control planing, and this simplifies the manual operation and lowers the cost.
Drawings
Fig. 1 is a top view of an anode flow field plate according to an embodiment;
fig. 2 is a cross-sectional view of the anode flow field plate of fig. 1 taken along the A-A direction;
FIG. 3 is a cross-sectional view of the anode flow field plate of FIG. 1 taken along the direction B-B;
FIG. 4 is a schematic, partially three-dimensional view of an anode flow field plate according to an embodiment;
FIG. 5 is a top view of the cathode flow field plate of one embodiment;
FIG. 6 is a cross-sectional view in the direction C-C of the cathode flow field plate of FIG. 5;
fig. 7 is a top view of the cathode flow field plate of embodiment two;
fig. 8 is a schematic diagram of the assembly of an active direct methanol fuel cell incorporating the cathode and anode flow field plates of the present invention.
Wherein: 1-anode end plate, 2-anode collector plate, 3-PTFE sealing ring, 4-cathode collector plate, 5-cathode end plate, 6-rubber gasket, 7-anode flow field plate, 8-membrane electrode assembly and 9-cathode flow field plate.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific examples, which are not to be construed as limiting the embodiments of the present invention. Unless otherwise indicated, the materials and processing methods employed in the present invention are those conventional in the art.
Example 1
As shown in fig. 1 to 6, a micro-channel flow field plate comprises an anode flow field plate and a cathode flow field plate, wherein the anode flow field plate and the cathode flow field plate are provided with an input hole and an output hole, two main channels respectively communicated with the input hole and the output hole of the cathode flow field plate are arranged on the surface of the cathode flow field plate in parallel, a plurality of linear cathode micro-channels (see fig. 5 and 6) with rib widths and channel widths of 1mm are arranged between the two main channels on the surface of the cathode flow field plate in parallel, and a hydrophobic layer is arranged on the surface of the cathode micro-channels; the surface of the anode flow field plate is uniformly provided with regular triangular platform-shaped linear anode micro-channels with width and depth gradually changed towards one end between two main channels, the upper bottom surface and the lower bottom surface of the regular triangular platform-shaped anode micro-channels are equilateral triangles, and three side surfaces are isosceles trapezoids (see figures 1 to 4).
The rib width and the narrowest part of the flow channel of the anode micro flow channel are 100 mu m, and the widest part is 400 mu m.
The contact angle of the hydrophobic layer is more than 145 degrees.
The anode flow field plate and the cathode flow field plate are made of metal or graphite, and brass is used as a substrate in the embodiment, so that the edge collapse effect generated during graphite planing can be avoided.
The surface of the anode micro-channel is provided with a metal protection film, the metal protection film is made of gold or nickel, and the gold is electroplated to serve as the metal protection film.
Example two
As shown in fig. 7, the present embodiment differs from the first embodiment in that: the surface of the cathode flow field plate is parallel without two main runners respectively communicated with an input hole and an output hole of the cathode flow field plate, but the cathode micro runners are connected in series into a serpentine shape, and the head end and the tail end of the cathode micro runners are respectively communicated with the input hole and the output hole of the cathode flow field plate.
Example III
A method of making the microchannel flow field plate, comprising the steps of:
1. drilling and processing on a substrate to obtain input and output holes of combustion-supporting gas and oxidant, and processing a corresponding main flow channel;
2. clamping a multi-tooth cutter on a numerical control planer and tightly fixing a cutter holder, and setting the processing parameters of the planer, wherein the processing parameters comprise a processing stroke, a cutting depth, a cutting speed, a cutting return start point and an increased depth after single cutting is finished, and the anode side flow field plate uses a multi-tooth triangular planer;
3. starting a planing machine, and automatically stopping after cutting and forming to obtain an anode flow field plate and a cathode flow field plate;
4. electroplating a layer of metal protective film on the surface of the anode flow field plate; and performing hydrophobic composite functional surface treatment on the cathode flow field plate.
Specifically, the hydrophobic composite functional surface treatment on the cathode flow field plate specifically comprises the following steps:
a) The surface pretreatment of the flow field plate, namely polishing the planed cathode flow field plate under sand paper to remove surface scratches, pits and oxide layers so as to enable the two surfaces to be flat, and then carrying out ultrasonic cleaning by deionized water; sequentially immersing in a KOH solution with the concentration of 100g/L for alkaline washing for 15s to remove greasy dirt and impurities on the surface of the material, then carrying out ultrasonic secondary washing by using deionized water, then carrying out acid washing by using an HCl solution with the mass fraction of 3wt% for 10s to remove a surface oxide layer, finally carrying out ultrasonic washing by using the deionized water, and naturally air-drying;
b) The surface deposition process in alkaline environment comprises the steps of immersing the cathode flow field plate after cleaning and air drying in a surface deposition solution for deposition for 1-2h at room temperature, taking out after the reaction, cleaning with deionized water, and air drying in air, wherein the surface deposition solution is 1.5mol/L NaOH and 0.1mo1/L K 2 S 2 O 8 Is a deionized water solution;
c) The sintering experimental equipment is a KBF16Q box-type atmosphere sintering furnace, the air-dried flow field plate is put into the furnace with protection gas protection, and the temperature is kept for 1-2h at 300-500 ℃, wherein the protection gas is argon or nitrogen;
d) And (3) a low surface energy solution modification process, namely soaking the cathode flow field plate subjected to sintering reinforcement in a surface modification solution for modification for 24 hours, taking out after modification, cleaning with an acetone reagent, and then airing in air to obtain a hydrophobic surface, wherein the surface modification solution is 0.01mol/L of stearic acid ethanol solution.
Example IV
A method of making the microchannel flow field plate, comprising the steps of:
1. drilling and processing on a substrate to obtain input and output holes of combustion-supporting gas and oxidant, and processing a corresponding main flow channel;
2. clamping a multi-tooth cutter on a numerical control planer and tightly fixing a cutter holder, and setting the processing parameters of the planer, wherein the processing parameters comprise a processing stroke, a cutting depth, a cutting speed, a cutting return start point and an increased depth after single cutting is finished, and the anode side flow field plate uses a multi-tooth triangular planer;
3. starting a planing machine, and automatically stopping after cutting and forming to obtain an anode flow field plate and a cathode flow field plate;
4. electroplating a layer of metal protective film on the surface of the anode flow field plate; and performing hydrophobic composite functional surface treatment on the cathode flow field plate.
Specifically, the hydrophobic composite functional surface treatment on the cathode flow field plate specifically comprises the following steps:
a) The surface pretreatment of the flow field plate, namely polishing the planed cathode flow field plate under sand paper to remove surface scratches, pits and oxide layers so as to enable the two surfaces to be flat, and then carrying out ultrasonic cleaning by deionized water; sequentially immersing in a KOH solution with the concentration of 150g/L for alkaline washing for 30s to remove greasy dirt and impurities on the surface of the material, then carrying out ultrasonic secondary washing by using deionized water, then carrying out acid washing by using an HCl solution with the mass fraction of 5wt% for 30s to remove a surface oxide layer, finally carrying out ultrasonic washing by using deionized water, and naturally air-drying;
b) The surface deposition process in alkaline environment comprises the steps of immersing the cathode flow field plate after cleaning and air drying in a surface deposition solution for deposition for 1-2h at room temperature, taking out after the reaction, cleaning with deionized water, and air drying in air, wherein the surface deposition solution is 2mol/L NaOH and 0.2mo1/L K 2 S 2 O 8 Is a deionized water solution;
c) The sintering experimental equipment is a KBF16Q box-type atmosphere sintering furnace, the air-dried flow field plate is put into the furnace with protection gas protection, and the temperature is kept for 1-2h at 300-500 ℃, wherein the protection gas is argon or nitrogen;
d) And (3) a low surface energy solution modification process, namely soaking the cathode flow field plate subjected to sintering reinforcement in a surface modification solution for modification for 24 hours, taking out after modification, cleaning with an acetone reagent, and then airing in air to obtain a hydrophobic surface, wherein the surface modification solution is 0.05mol/L of stearic acid ethanol solution.
Example five
A method of making the microchannel flow field plate, comprising the steps of:
1. drilling and processing on a substrate to obtain input and output holes of combustion-supporting gas and oxidant, and processing a corresponding main flow channel;
2. clamping a multi-tooth cutter on a numerical control planer and tightly fixing a cutter holder, and setting the processing parameters of the planer, wherein the processing parameters comprise a processing stroke, a cutting depth, a cutting speed, a cutting return start point and an increased depth after single cutting is finished, and the anode side flow field plate uses a multi-tooth triangular planer;
3. starting a planing machine, and automatically stopping after cutting and forming to obtain an anode flow field plate and a cathode flow field plate;
4. electroplating a layer of metal protective film on the surface of the anode flow field plate; and performing hydrophobic composite functional surface treatment on the cathode flow field plate.
Specifically, the hydrophobic composite functional surface treatment on the cathode flow field plate specifically comprises the following steps:
a) The surface pretreatment of the flow field plate, namely polishing the planed cathode flow field plate under sand paper to remove surface scratches, pits and oxide layers so as to enable the two surfaces to be flat, and then carrying out ultrasonic cleaning by deionized water; sequentially immersing in a KOH solution with the concentration of 200g/L for alkaline washing for 45s to remove greasy dirt and impurities on the surface of the material, then carrying out ultrasonic secondary washing by using deionized water, then carrying out acid washing by using an HCl solution with the mass fraction of 11wt% for 40s to remove a surface oxide layer, finally carrying out ultrasonic washing by using deionized water, and naturally air-drying;
b) The surface deposition process in alkaline environment comprises the steps of immersing the cathode flow field plate after cleaning and air drying in a surface deposition solution for deposition for 1-2h at room temperature, taking out after the reaction, cleaning with deionized water, and air drying in air, wherein the surface deposition solution is 2.5mol/L NaOH and 0.5mo1/L K 2 S 2 O 8 Is a deionized water solution;
c) The sintering experimental equipment is a KBF16Q box-type atmosphere sintering furnace, the air-dried flow field plate is put into the furnace with protection gas protection, and the temperature is kept for 1-2h at 300-500 ℃, wherein the protection gas is argon or nitrogen;
d) And (3) a low surface energy solution modification process, namely soaking the cathode flow field plate subjected to sintering reinforcement in a surface modification solution for modification for 36 hours, taking out after modification, cleaning with an acetone reagent, and then airing in air to obtain a hydrophobic surface, wherein the surface modification solution is 0.1mol/L of stearic acid ethanol solution.
The anode flow field plate and the cathode flow field plate provided in the above embodiment are applied to an active direct methanol fuel cell, and an assembly schematic diagram of the active direct methanol fuel cell is shown in fig. 8, and the active direct methanol fuel cell includes an anode end plate 1, an anode current collecting plate 2, a PTFE seal ring 3, a cathode current collecting plate 4, a cathode end plate 5, a rubber gasket 6, an anode flow field plate 7, a membrane electrode assembly 8, and a cathode flow field plate 9, which are sequentially connected. The anode flow field plate 2 and the cathode flow field plate 9 are respectively arranged at hollowed-out parts of the anode current collecting plate 2 and the cathode current collecting plate 4, and finally are carried in an active methanol fuel cell for use.
Practice shows that after the anode flow field plate and the cathode flow field plate provided by the embodiment are installed, the active methanol fuel cell has the following advantages:
according to the micro-channel triangular prism table divergent structure at the anode side, on one hand, the effect of water-gas separation is realized, and meanwhile, the gas diffusion is more uniform by increasing the relative flow area ratio, the carbon dioxide discharge rate is accelerated, and the condition that an anode product blocks a methanol transmission channel is relieved; on the other hand, as a methanol blocking structure, the methanol penetration phenomenon is effectively reduced, and the high-concentration methanol reaction is possible. On the cathode side, the micro-flow channel improves the feeding pressure of oxygen, accelerates the discharge of water, and can realize the effect of 'water reverse compensation' through hydrophobic surface treatment, thereby not only playing a positive role in cathode water management, but also promoting the anode reaction progress rate, and further improving the comprehensive performance of the battery.
The above examples of the present invention are only examples for clearly illustrating the present invention, and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. A micro-channel flow field plate, includes anode flow field plate and cathode flow field plate that is provided with input hole and output hole, its characterized in that: the surface of the cathode flow field plate is uniformly provided with cathode micro-channels which are communicated with an input hole and an output hole of the cathode flow field plate and have the rib width and the channel width of 0.5-1.5 mm, and the surface of the cathode micro-channels is provided with a hydrophobic layer; the surface of the anode flow field plate is provided with two main runners which are respectively communicated with an input hole and an output hole, a regular triangular platform-shaped anode micro-runner with width and depth gradually changed towards one end is uniformly arranged between the two parallel main runners, and the surface of the anode micro-runner is provided with a metal protective film.
2. The microchannel flow field plate as set forth in claim 1, wherein: the rib width and the narrowest part of the flow channel of the anode micro flow channel are 100 mu m, and the widest part is 400 mu m.
3. The microchannel flow field plate as set forth in claim 1, wherein: the surface of the cathode flow field plate is provided with two main runners which are respectively communicated with an input hole and an output hole of the cathode flow field plate in parallel, and the cathode micro-runners are arranged between the two parallel main runners in a linear type in parallel;
or alternatively, the process may be performed,
the cathode micro-flow channel is connected in series into a snake shape, and the head end and the tail end of the cathode micro-flow channel are respectively communicated with the input hole and the output hole of the cathode flow field plate.
4. The microchannel flow field plate as set forth in claim 1, wherein: the contact angle of the hydrophobic layer is more than 145 degrees.
5. The microchannel flow field plate as set forth in claim 1, wherein: the metal-plated protective film is made of gold or nickel.
6. The microchannel flow field plate as set forth in claim 1, wherein: the anode flow field plate and the cathode flow field plate are made of metal or graphite.
7. A method of manufacturing a microchannel flow field plate as claimed in any one of claims 1 to 6, comprising the steps of:
drilling and processing on a substrate to obtain input and output holes of combustion-supporting gas and oxidant, and processing a corresponding main flow channel;
clamping a multi-tooth cutter on a numerical control planer and tightly fixing a cutter holder, wherein the set planer processing parameters comprise a processing stroke, a cutting depth, a cutting speed, a cutting return start point and an increased depth after single cutting is finished;
starting a planing machine, and automatically stopping after cutting and forming to obtain an anode flow field plate and a cathode flow field plate;
electroplating a layer of metal protective film on the surface of the anode flow field plate;
and performing hydrophobic composite functional surface treatment on the cathode flow field plate.
8. The method of manufacturing according to claim 7, wherein: the hydrophobic composite functional surface treatment on the cathode flow field plate specifically comprises the following steps:
a) The surface pretreatment of the flow field plate, namely polishing the planed cathode flow field plate under sand paper to remove surface scratches, pits and oxide layers so as to enable the two surfaces to be flat, and then carrying out ultrasonic cleaning by deionized water; sequentially immersing in 100-200 g/L KOH solution for alkaline washing for 15-45 s to remove greasy dirt and impurities on the surface of the material, then carrying out ultrasonic secondary washing by using deionized water, then carrying out acid washing by using 3-11 wt% HCl solution for 10-40 s to remove a surface oxide layer, finally carrying out ultrasonic cleaning by using deionized water, and naturally air-drying;
b) Immersing the cathode flow field plate after cleaning and air drying in a surface deposition solution, depositing for 1-2h at room temperature, taking out after the reaction is finished, cleaning with deionized water, and air drying in air;
the sintering experimental equipment is a KBF16Q box-type atmosphere sintering furnace, the air-dried flow field plate is placed into the sintering furnace with protection gas protection, and the temperature is kept for 1-2h at 300-500 ℃, wherein the protection gas is argon or nitrogen;
c) And (3) a low surface energy solution modification process, namely immersing the cathode flow field plate subjected to sintering reinforcement in a surface modification solution for modification for 24-36 h, taking out after modification, cleaning with an acetone reagent, and then airing in air to obtain the hydrophobic surface.
9. The method of manufacturing according to claim 8, wherein: the surface deposition solution is 1.5-2.5 mol/L NaOH and 0.1-0.5 mo1/L K 2 S 2 O 8 Is a deionized water solution.
10. The method of manufacturing according to claim 9, wherein: the surface modification solution is 0.01-0.1 mol/L stearic acid ethanol solution.
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