CN109390604A - A kind of novel fluid channel flow-field plate and preparation method thereof - Google Patents
A kind of novel fluid channel flow-field plate and preparation method thereof Download PDFInfo
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- CN109390604A CN109390604A CN201811449364.2A CN201811449364A CN109390604A CN 109390604 A CN109390604 A CN 109390604A CN 201811449364 A CN201811449364 A CN 201811449364A CN 109390604 A CN109390604 A CN 109390604A
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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
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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
- H01M8/10—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]
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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 kind of novel fluid channel flow-field plates and preparation method thereof, including anode flow field board and cathode flow field plate, the surface of the cathode flow field plate is evenly arranged with its input hole of connection and delivery outlet and rib width and width of flow path are the cathode fluid channel of 0.5 ~ 1.5mm, and cathode fluid channel surface is provided with hydrophobic layer；The surface of the anode flow field board is arranged in parallel with two sprues for being respectively communicated with its input hole and delivery outlet, the positive trigone mesa-shaped sample anode fluid channel of width and depth to one end gradual change is evenly arranged between two sprues, the surface of the anode fluid channel is provided with protective metal film.The present invention alleviates the case where anodic product blocking methanol transmission channels, and effectively reduces methanol crossover phenomenon as resistance alcohol structure, realizes high concentration methanol reaction.Cathode side fluid channel improves the feed pressure of oxygen, accelerates the discharge of water, while passing through hydrophobic surface treatments, " water is counter to be mended " effect is realized, to improve battery comprehensive performance.
Description
Technical field
The present invention relates to direct methanol fuel cell technical field, specifically a kind of novel fluid channel flow-field plate and its system
Preparation Method.
Background technique
The electric energy that fuel cell generates directly directly is transformed by the chemical energy of raw material itself, and energy with higher
Metric density, lower environmental contamination, it is receive more and more attention along with the advantages such as rich of raw material.Wherein, phase
Hydrogen feedstock than belonging to hydrogen fuel cell in Proton Exchange Membrane Fuel Cells produces that at high cost, storage and transportation is dangerous and use condition is severe
The factors such as quarter, belong to similar direct methanol fuel cell using methanol as anode material, (generally exist because its operating temperature is low
Working and room temperature), theoretical specific energy it is high, it is easy to carry and using it is safe the features such as have good application prospect, thought by industry
It is the types of fuel cells for being most hopeful to take the lead in realizing the marketization.
However also occur many problem of urgently handling in direct methanol fuel cell research and development and use process.One side
Surface anode carbon dioxide blockage and cathode water logging belong to product problem of management and are entered after product generates by flaring type fluid channel
Into flow field, suitable flaring type and flow field structure will be helpful to the timely and effective disengaging of product and discharge, otherwise will will affect anti-
The distribution of object, or even barrier completely are answered, basic fuel supply can not be provided for electrochemical reaction, battery performance is caused to reduce,
Even stop working.On the other hand for reactant management aspect, the presence of methanol crossover is to inhibit direct methanol fuel cell
The important bottleneck of development, generates mixed potential since the methanol penetrated directly reacts with the oxygen of cathode, methanol crossover is not
It is evitable to lead to the loss of voltage, while causing the loss of fuel.
In order to solve the above problem, on the one hand start with from improvement flow field plate structure, design reasonable flow field plate structure, improve resistance
The discharge capacity of alcohol ability and product carbon dioxide.Traditional flow field plate structure has: round shape, palisade etc., however this kind of flow field
Plate is extremely limited to the raising of resistance alcohol ability, has research using resistance alcohol layer of the fibrofelt as methanol fuel cell, improves first
The methanol solution optimal concentration of alcohol fuel battery has positive effect to energy content of battery ratio is improved.However, in high current work item
Under part, anode generates a large amount of bubbles and needs to exclude across fibrofelt, this unavoidably blocks the transmission channels of methanol, so that in sun
Easily there is methanol hunger phenomenon, limits the further promotion of methanol fuel cell performance.
On the other hand, from the fine preparation of bipolar plates fluid channel shape, improve power density start with, with guarantee PEMFC and
While DMFE is miniaturized, enough power can be generated.Currently, MEMS technology is micro fuel cell battery bipolar plate micro channel preparation
Mainstream technology can be etched on silicon using technologies such as photoetching, burn into sputtering and the processing of body/surface in MEMS
Then fluid channel prepares the collected currents such as Pt layers, Au layers on surface using film preparing technology.MEMS technology preparation simultaneously
Fluid channel width is generally between 300-500 μm, and depth is between 200-300 μm, since MEMS technology is derived from microelectronics skill
Art needs super-clean environment, and complex process, main processing object is limited on the materials such as silicon, and silicon belongs to fragile material, it is difficult to
Laminate, be unfavorable for improving volumetric specific power and quality specific power, be also unfavorable for the assembly of pile, and the conductivity of silicon compared with
It is low, reduce the performance of fuel cell.
Goal of the invention of the invention is to shunt dioxy caused by difficulty for gas (carbon dioxide gas) liquid (methanol solution)
The technical deficiency for changing the too slow processing with existing fluid channel of carbon emission rate, provide the design of novel fluid channel flow-field plate a kind of with
Assembly method.
Summary of the invention
In order to effectively alleviate the gas obstruction and cathode water logging problem of anode, to improve the defeated of active type fuel cell
Performance out.The invention discloses a kind of novel fluid channel flow-field plates and preparation method thereof.The present invention is to anode, cathode flow field plate
It relates to, anode side flow field plate is provided with uniformly distributed trigone bench-type fluid channel, and cathode side is provided with wider conducive to the flat of water conveying
Row fluid channel, while hydrophobic treatment is carried out to cathode side flow field plate.
The present invention is achieved through the following technical solutions:
A kind of novel fluid channel flow-field plate, anode flow field board and cathode flow field plate including being provided with input hole and delivery outlet,
The surface of the cathode flow field plate be evenly arranged be connected to its input hole and delivery outlet and rib width and width of flow path be 0.5 ~
The cathode fluid channel of 1.5mm, cathode fluid channel surface are provided with hydrophobic layer；The surface of the anode flow field board is arranged in parallel
There are two sprues for being respectively communicated with its input hole and delivery outlet, width and depth are evenly arranged between two parallel sprues to one
The positive trigone mesa-shaped sample anode fluid channel of gradual change is held, the surface of the anode fluid channel is provided with protective metal film.
Further, the most narrow place of rib width Yu runner of the anode fluid channel is 100 μm, and the widest part is 400 μm.
Further, the surface of the cathode flow field plate is arranged in parallel with two masters for being respectively communicated with its input hole and delivery outlet
Runner, the cathode fluid channel, which is of a straight line type, to be arranged in parallel between two parallel sprues；
Alternatively,
The cathode fluid channel be connected into snakelike and head and the tail both ends respectively with the input hole of the cathode flow field plate and delivery outlet phase
Connection.
Further, the contact angle of the hydrophobic layer is at 145 ° or more.
Further, the material of institute's plating metal protective film is gold or nickel.
Further, the material of the anode flow field board and cathode flow field plate is metal or graphite.
A kind of preparation method of such as fluid channel flow-field plate, comprising steps of
Drilling processing obtains the input of combustion-supporting gas and oxidant, delivery outlet on substrate, and processes corresponding sprue；
By multitooth tool clamping on numerical control planer and tightening knife rest, setting planer machined parameters include processing stroke, cutting
Increase depth after depth, cutting speed, cutting backhaul starting point, single cutting；
Start planer, be automatically stopped after cutting forming, anode flow field board and cathode flow field plate is made；
In one layer of protective metal film of electroplating surface of anode flow field board；Hydrophobic compound functionality is carried out in the cathode flow field plate
Surface treatment.
Further, hydrophobic compound functional surface processing is carried out in the cathode flow field plate specifically include step:
A) flow field plate faces pre-process: will planing treated that the cathode flow field plate is polished under sand paper, removal surface scratch,
Pit and oxide layer, so that two surfacings, then carry out ultrasonic cleaning with deionized water；And then it successively immerses concentration and is
15 ~ 45s of alkali cleaning removes material surface greasy dirt impurity in the KOH solution of 100 ~ 200g/L, then carries out ultrasonic wave with deionized water
Then secondary cleaning is that 10 ~ 40s of pickling is finally used in the HCl solution of 3wt ~ 5wt% with removing surface oxide layer with mass fraction
Deionized water progress ultrasonic cleaning is clean, natural air drying；
B) alkaline environment surface depositing operation: the cathode flow field plate after cleaning is air-dried is immersed in the deposition solution of surface
1 ~ 2h is deposited at room temperature, is taken out, is air-dried in air after reaction after being cleaned up with deionized water;
C) atmosphere solid-phase sintering process: sintering experiment equipment is the box atmosphere sintering furnace of KBF16Q, and the flow-field plate after air-drying is put
Enter in this furnace with protective gas protection, 1-2h is kept the temperature at 300 ~ 500 DEG C, the protective gas is argon gas or nitrogen；
D) low-surface-energy solution modification process: the cathode flow field plate after sinter is immersed in surface modification solution
Modify 24 ~ 36h, take out after modification, cleaned up with acetone reagent, then drop a hint in air-dry to get to hydrophobic surface.
Further, the surface deposition solution is 1.5 ~ 2.5mol/L NaOH and 0.1 ~ 0.5mo1/L K2S2O8Go
Deionized water solution.
Further, the surface modification solution is the stearic acid ethanol solution of 0.01 ~ 0.1mol/L.
Compared with prior art, the present invention mainly has following several big features:
1, traditional flow field plate runner is mostly grade, and new flow field plate uses the fluid channel of submillimeter level, can more have
Effect ground improves compressive load per unit area, increases the fuel efficiency of supply, enhances the spilling of bubble, promotes gas distribution uniformity.
2, traditional flaring type flow-field plate majority uses the trapezoidal flaring mode of planar, promotes gas-liquid separation effect and gas
It is unobvious that effect is discharged, new flow field plate uses the positive trigone bench-type divergent current road of 3 D stereo, three sides of three-dimensional runner
It is trapezium structure, anodic product carbon dioxide is discharged high efficiency by flaring type conduit, and anodic product blocking is effectively relieved
The case where methanol transmission channels cause battery performance to reduce.
3, the assembly method of traditional flow-field plate is identical using cathode anode flow-field plate form, and the present invention is to reach preferably to imitate
Fruit uses different processing modes to the flow-field plate of anode and cathode, even if being fluid channel flow-field plate, but combines cathode water
The difference for managing anodic gas management devises the wide form with rib width of different runners, to improve the comprehensive performance of battery.
4, different from traditional flow field plate design, the design is further to improve flow-field plate in order to realize " water is counter to be mended "
Can, the present invention has carried out a series of surface hydrophobicity to cathode and has handled, to realize cathode side " water is counter to be mended " effect, accelerates water
Discharge, anti-yang-tonifying pole.
5, different from traditional flow-field plate manufacturing process, the preparation of the flow-field plate of the design anode cathode is all dug by numerical control
Acquisition is cut, greatlies simplify manually-operated cumbersome, is reduced costs.
Detailed description of the invention
Fig. 1 is the top view of anode flow field board described in embodiment one；
Fig. 2 is anode flow field board described in Fig. 1 along A-A sectional view；
Fig. 3 is cross-sectional view of the anode flow field board described in Fig. 1 along the direction B-B；
Fig. 4 is anode flow field board partial 3-D schematic diagram described in embodiment one；
Fig. 5 is cathode flow field plate top view described in embodiment one；
Fig. 6 is the cross-sectional view in the direction C-C in cathode flow field plate described in Fig. 5；
Fig. 7 is the cathode flow field plate top view of embodiment two；
Fig. 8 is the assembling schematic diagram for being equipped with the active direct methanol fuel cell of cathode and anode flow field board 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 sheet gasket, 7- anode flow field board, 8- membrane electrode assembly, 9- cathode flow field plate.
Specific embodiment
The object of the invention will be described in further detail in the following with reference to the drawings and specific embodiments, and embodiment is not
It can repeat one by one herein, but therefore embodiments of the present invention are not limited to the following examples.Unless stated otherwise, of the invention
The material and processing method used is the art conventional material and processing method.
Embodiment one
As shown in Figures 1 to 6, a kind of novel fluid channel flow-field plate, the anode flow field including being provided with input hole and delivery outlet
Plate and cathode flow field plate, the surface of the cathode flow field plate are arranged in parallel with two mainstreams for being respectively communicated with its input hole and delivery outlet
Road, the surface of the cathode flow field plate is arranged in parallel with several rib widths between two sprues and width of flow path is the straight line of 1mm
Shape cathode fluid channel (see Fig. 5 and Fig. 6), cathode fluid channel surface are provided with hydrophobic layer；The surface of the anode flow field board
The positive trigone mesa-shaped linear anode fluid channel of width and depth to one end gradual change is evenly arranged between two sprues, it is described
The upper bottom surface of positive trigone mesa-shaped anode fluid channel is equilateral triangle, and three sides are isosceles trapezoid (see Fig. 1 to Fig. 4).
The rib width of the anode fluid channel and the most narrow place of runner are 100 μm, and the widest part is 400 μm.
The contact angle of the hydrophobic layer is at 145 ° or more.
The material of the anode flow field board and cathode flow field plate is metal or graphite, and the present embodiment is using brass as base
Plate, the side generated when can plane to avoid graphite collapse effect.
The surface of the anode fluid channel is provided with protective metal film, and the material of institute's plating metal protective film is golden or nickel, this
Embodiment electroplating gold is as metal protective film.
Embodiment two
As shown in fig. 7, the difference between this embodiment and the first embodiment lies in: the surface of the cathode flow field plate is not provided with point in parallel
It is not connected to two sprues of its input hole and delivery outlet, but the cathode fluid channel is connected into snakelike and head and the tail both ends and is distinguished
It is connected with the input hole of the cathode flow field plate and delivery outlet.
Embodiment three
A kind of preparation method of such as fluid channel flow-field plate, comprising steps of
One, drilling processing obtains the input of combustion-supporting gas and oxidant, delivery outlet on substrate, and processes corresponding mainstream
Road；
Two, by multitooth tool clamping on numerical control planer and tightening knife rest, setting planer machined parameters include processing stroke, cut
Cut the increase depth after depth, cutting speed, cutting backhaul starting point, single cutting, wherein the anode side flow field plate makes
With multiple tooth triangle planing tool；
Three, start planer, be automatically stopped after cutting forming, anode flow field board and cathode flow field plate is made；
Four, in one layer of protective metal film of the electroplating surface of anode flow field board；Hydrophobic compound function is carried out in the cathode flow field plate
It can property surface treatment.
Specifically, hydrophobic compound functional surface processing is carried out in the cathode flow field plate specifically include step:
A) flow field plate faces pre-process: will planing treated that the cathode flow field plate is polished under sand paper, removal surface scratch,
Pit and oxide layer, so that two surfacings, then carry out ultrasonic cleaning with deionized water；And then it successively immerses concentration and is
Alkali cleaning 15s removes material surface greasy dirt impurity in the KOH solution of 100g/L, and it is secondary clear then to carry out ultrasonic wave with deionized water
It washes, is then that pickling 10s is finally carried out with deionized water in the HCl solution of 3wt% with removing surface oxide layer with mass fraction
Ultrasonic cleaning is clean, natural air drying；
B) alkaline environment surface depositing operation: the cathode flow field plate after cleaning is air-dried is immersed in the deposition solution of surface
1 ~ 2h is deposited at room temperature, takes out, air-dries in air after reaction after being cleaned up with deionized water, and the surface deposition is molten
Liquid is 1.5mol/L NaOH and 0.1mo1/L K2S2O8Deionized water solution；
C) atmosphere solid-phase sintering process: sintering experiment equipment is the box atmosphere sintering furnace of KBF16Q, and the flow-field plate after air-drying is put
Enter in this furnace with protective gas protection, 1-2h is kept the temperature at 300 ~ 500 DEG C, the protective gas is argon gas or nitrogen；
D) low-surface-energy solution modification process: the cathode flow field plate after sinter is immersed in surface modification solution and is repaired
Decorations for 24 hours, take out after modification, are cleaned up with acetone reagent, then drop a hint in air-dry to get to hydrophobic surface, it is described
Surface modification solution is the stearic acid ethanol solution of 0.01mol/L.
Example IV
A kind of preparation method of such as fluid channel flow-field plate, comprising steps of
One, drilling processing obtains the input of combustion-supporting gas and oxidant, delivery outlet on substrate, and processes corresponding mainstream
Road；
Two, by multitooth tool clamping on numerical control planer and tightening knife rest, setting planer machined parameters include processing stroke, cut
Cut the increase depth after depth, cutting speed, cutting backhaul starting point, single cutting, wherein the anode side flow field plate makes
With multiple tooth triangle planing tool；
Three, start planer, be automatically stopped after cutting forming, anode flow field board and cathode flow field plate is made；
Four, in one layer of protective metal film of the electroplating surface of anode flow field board；Hydrophobic compound function is carried out in the cathode flow field plate
It can property surface treatment.
Specifically, hydrophobic compound functional surface processing is carried out in the cathode flow field plate specifically include step:
A) flow field plate faces pre-process: will planing treated that the cathode flow field plate is polished under sand paper, removal surface scratch,
Pit and oxide layer, so that two surfacings, then carry out ultrasonic cleaning with deionized water；And then it successively immerses concentration and is
Alkali cleaning 30s removes material surface greasy dirt impurity in the KOH solution of 150g/L, and it is secondary clear then to carry out ultrasonic wave with deionized water
It washes, is then that pickling 30s is finally carried out with deionized water in the HCl solution of 5wt% with removing surface oxide layer with mass fraction
Ultrasonic cleaning is clean, natural air drying；
B) alkaline environment surface depositing operation: the cathode flow field plate after cleaning is air-dried is immersed in the deposition solution of surface
1 ~ 2h is deposited at room temperature, takes out, air-dries in air after reaction after being cleaned up with deionized water, and the surface deposition is molten
Liquid is 2mol/L NaOH and 0.2mo1/L K2S2O8Deionized water solution；
C) atmosphere solid-phase sintering process: sintering experiment equipment is the box atmosphere sintering furnace of KBF16Q, and the flow-field plate after air-drying is put
Enter in this furnace with protective gas protection, 1-2h is kept the temperature at 300 ~ 500 DEG C, the protective gas is argon gas or nitrogen；
D) low-surface-energy solution modification process: the cathode flow field plate after sinter is immersed in surface modification solution and is repaired
Decorations for 24 hours, take out after modification, are cleaned up with acetone reagent, then drop a hint in air-dry to get to hydrophobic surface, it is described
Surface modification solution is the stearic acid ethanol solution of 0.05mol/L.
Embodiment five
A kind of preparation method of such as fluid channel flow-field plate, comprising steps of
One, drilling processing obtains the input of combustion-supporting gas and oxidant, delivery outlet on substrate, and processes corresponding mainstream
Road；
Two, by multitooth tool clamping on numerical control planer and tightening knife rest, setting planer machined parameters include processing stroke, cut
Cut the increase depth after depth, cutting speed, cutting backhaul starting point, single cutting, wherein the anode side flow field plate makes
With multiple tooth triangle planing tool；
Three, start planer, be automatically stopped after cutting forming, anode flow field board and cathode flow field plate is made；
Four, in one layer of protective metal film of the electroplating surface of anode flow field board；Hydrophobic compound function is carried out in the cathode flow field plate
It can property surface treatment.
Specifically, hydrophobic compound functional surface processing is carried out in the cathode flow field plate specifically include step:
A) flow field plate faces pre-process: will planing treated that the cathode flow field plate is polished under sand paper, removal surface scratch,
Pit and oxide layer, so that two surfacings, then carry out ultrasonic cleaning with deionized water；And then it successively immerses concentration and is
Alkali cleaning 45s removes material surface greasy dirt impurity in the KOH solution of 200g/L, and it is secondary clear then to carry out ultrasonic wave with deionized water
It washes, is then that pickling 40s is finally carried out with deionized water in the HCl solution of 11wt% with removing surface oxide layer with mass fraction
Ultrasonic cleaning is clean, natural air drying；
B) alkaline environment surface depositing operation: the cathode flow field plate after cleaning is air-dried is immersed in the deposition solution of surface
1 ~ 2h is deposited at room temperature, takes out, air-dries in air after reaction after being cleaned up with deionized water, and the surface deposition is molten
Liquid is 2.5mol/L NaOH and 0.5mo1/L K2S2O8Deionized water solution；
C) atmosphere solid-phase sintering process: sintering experiment equipment is the box atmosphere sintering furnace of KBF16Q, and the flow-field plate after air-drying is put
Enter in this furnace with protective gas protection, 1-2h is kept the temperature at 300 ~ 500 DEG C, the protective gas is argon gas or nitrogen；
D) low-surface-energy solution modification process: the cathode flow field plate after sinter is immersed in surface modification solution and is repaired
Adorn 36h, take out after modification, cleaned up with acetone reagent, then drop a hint in air-dry to get to hydrophobic surface, it is described
Surface modification solution is the stearic acid ethanol solution of 0.1mol/L.
Anode flow field board and cathode flow field plate provided by the above embodiment are applied in active direct methanol fuel cell,
The assembling schematic diagram of the active direct methanol fuel cell is as shown in figure 8, include sequentially connected anode end plate 1, anode
Collector plate 2, PTFE sealing ring 3, cathode collector plate 4, cathode end plate 5, rubber sheet gasket 6, anode flow field board 7, membrane electrode assembly 8,
Cathode flow field plate 9.Wherein the anode flow field board 2 and cathode flow field plate 9 are attached separately to anode collector plate 2 and cathode collector plate 4
Hollow-out parts are finally mounted in active methanol fuel cell and use.
Practice have shown that after anode flow field board and cathode flow field plate provided by the above embodiment are installed, active methanol fuel
Battery has the advantage that
On the one hand the present invention realizes the effect of aqueous vapor separation in the fluid channel triangle terrace with edge divergent structure of anode-side, lead to simultaneously
The opposite flow area ratio of increase is crossed, keeps gas diffusion more uniform, accelerates the rate of carbon dioxide discharge, it is stifled to alleviate anodic product
The case where filling in methanol transmission channels；On the other hand, as resistance alcohol structure, methanol crossover phenomenon is effectively reduced, high concentration methanol is made
It is reacted to possibility.In cathode side, fluid channel improves the feed pressure of oxygen, accelerates the discharge of water, while by hydrophobic
Property surface treatment, it can be achieved that " water is counter to be mended " effect, had not only played positive effect to cathode water management, but also can promote anode reaction into
Scanning frequency rate, to improve battery comprehensive performance.
The above embodiment of the present invention is only intended to clearly illustrate examples made by the present invention, and is not to of the invention
The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description
Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should be included in the protection model of the claims in the present invention within mind and principle
Within enclosing.
Claims (10)
1. a kind of novel fluid channel flow-field plate, anode flow field board and cathode flow field including being provided with input hole and delivery outlet
Plate, it is characterised in that: the surface of the cathode flow field plate, which is evenly arranged with, is connected to its input hole and delivery outlet and rib width and runner
Width is the cathode fluid channel of 0.5 ~ 1.5mm, and cathode fluid channel surface is provided with hydrophobic layer；The anode flow field board
Surface is arranged in parallel with two sprues for being respectively communicated with its input hole and delivery outlet, is evenly arranged with width between two parallel sprues
To the positive trigone mesa-shaped sample anode fluid channel of one end gradual change, the surface of the anode fluid channel is provided with metal protection for degree and depth
Film.
2. fluid channel flow-field plate according to claim 1, it is characterised in that: the rib width and runner of the anode fluid channel are most
Narrow place is 100 μm, and the widest part is 400 μm.
3. fluid channel flow-field plate according to claim 1, it is characterised in that: the surface of the cathode flow field plate is arranged in parallel
There are two sprues for being respectively communicated with its input hole and delivery outlet, the cathode fluid channel, which is of a straight line type, is arranged in parallel in two parallel masters
Between runner；
Alternatively,
The cathode fluid channel be connected into snakelike and head and the tail both ends respectively with the input hole of the cathode flow field plate and delivery outlet phase
Connection.
4. fluid channel flow-field plate according to claim 1, it is characterised in that: the contact angle of the hydrophobic layer 145 ° with
On.
5. fluid channel flow-field plate according to claim 1, it is characterised in that: the material of institute's plating metal protective film be gold or
Nickel.
6. fluid channel flow-field plate according to claim 1, it is characterised in that: the anode flow field board and cathode flow field plate
Material is metal or graphite.
7. a kind of preparation method of the fluid channel flow-field plate as described in any one of claim 1 to 6, comprising steps of
Drilling processing obtains the input of combustion-supporting gas and oxidant, delivery outlet on substrate, and processes corresponding sprue；
By multitooth tool clamping on numerical control planer and tightening knife rest, setting planer machined parameters include processing stroke, cutting
Increase depth after depth, cutting speed, cutting backhaul starting point, single cutting；
Start planer, be automatically stopped after cutting forming, anode flow field board and cathode flow field plate is made；
In one layer of protective metal film of electroplating surface of anode flow field board；
Hydrophobic compound functional surface processing is carried out in the cathode flow field plate.
8. preparation method according to claim 7, it is characterised in that: carry out hydrophobic compound function in the cathode flow field plate
Energy property surface treatment specifically includes step:
Flow field plate faces pretreatment: will planing treated that the cathode flow field plate is polished under sand paper, it is removal surface scratch, recessed
Hole and oxide layer, so that two surfacings, then carry out ultrasonic cleaning with deionized water；And then successively immerse concentration be 100 ~
15 ~ 45s of alkali cleaning removes material surface greasy dirt impurity in the KOH solution of 200g/L, and it is secondary then to carry out ultrasonic wave with deionized water
Cleaning, is then that 10 ~ 40s of pickling is finally spent in the HCl solution of 3wt ~ 11wt% with removing surface oxide layer with mass fraction
Ionized water progress ultrasonic cleaning is clean, natural air drying；
Alkaline environment surface depositing operation: the cathode flow field plate after cleaning is air-dried is immersed in the deposition solution of surface in room
Temperature is lower to deposit 1 ~ 2h, takes out, air-dries in air after reaction after being cleaned up with deionized water;
Atmosphere solid-phase sintering process: sintering experiment equipment is the box atmosphere sintering furnace of KBF16Q, and the flow-field plate after air-drying is put into
In sintering furnace with protective gas protection, 1-2h is kept the temperature at 300 ~ 500 DEG C, the protective gas is argon gas or nitrogen；
Low-surface-energy solution modification process: the cathode flow field plate after sinter is immersed in surface modification solution and is modified
24 ~ 36h takes out after modification, is cleaned up with acetone reagent, then drop a hint in air-dry to get to hydrophobic surface.
9. preparation method according to claim 8, it is characterised in that: the surface deposition solution is 1.5 ~ 2.5mol/L
NaOH and 0.1 ~ 0.5mo1/L K2S2O8Deionized water solution.
10. preparation method according to claim 9, it is characterised in that: the surface modification solution is 0.01 ~ 0.1mol/L
Stearic acid ethanol solution.
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