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Method for preparing bipolar plate with catalytication

A bipolar plate and catalyst technology, applied in battery electrodes, electrochemical generators, fuel cell components, etc., can solve the problems of easy oxidation of aluminum alloy, increase of nano-scale platinum, increase of contact resistance, etc.

Inactive Publication Date: 2008-11-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering factors such as electrical conductivity, mechanical strength, and density, aluminum alloy can be used as a bipolar plate material for proton exchange membrane fuel cells. Treatment prevents oxidation and improves electrical contact performance
The most ideal electrocatalyst for proton exchange membrane fuel cells is platinum, but platinum resources are scarce, expensive and have low utilization rate. For example, the utilization rate of platinum in platinum particles with a particle size of 12nm is only about 10%.
Platinum utilization on carbon, platinum alloying, and micronization can be used to improve the utilization rate of platinum. Nanoscale platinum catalysts can be obtained on carbon supports by sol method, ion exchange method, and direct reduction of platinum salts. Nano-scale platinum is very prone to agglomeration and gradually becomes larger; in platinum-based alloys prepared by traditional alloying methods, the content of platinum is 20-60%, and the best efficiency of platinum is about 1g platinum / kW power

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Using aluminum alloy with a thickness of 3mm as the base material, the flow field is prepared by computer engraving method. The surface of the alloy is modified, and the composition and process parameters of the electrodeposited nickel solution are: nickel sulfate heptahydrate 150g / L, sodium chloride 8g / L, boric acid 25g / L, magnesium sulfate heptahydrate 25g / L, pH=4.0, and the temperature is 35℃, cathode current density 0.05A / dm 2 Electrodeposit platinum and nickel to form an alloy catalyst to obtain a catalytic aluminum alloy bipolar plate. The composition and process parameters of the electrodeposited platinum solution: platinum salt content 7g / L in terms of platinum, sulfamic acid 25g / L, sulfamic acid Ammonium acid 5g / L, pH=3.0, temperature 50°C, cathode current density 1.5A / cm 2 ; Bipolar plate technical parameters: channel width and depth 0.5mm, nickel layer thickness 30μm, platinum alloy particle size 1nm, 3mm thick bipolar plate volume resistivity 4.9μΩ.cm.

Embodiment 2

[0013] Electrodeposited nickel solution composition and process parameters: nickel sulfate heptahydrate 200g / L, sodium chloride 15g / L, boric acid 35g / L, magnesium sulfate heptahydrate 35g / L, pH=3.0, temperature 10°C, cathode current density 2.0 A / dm 2 ; Platinum electrodeposition solution composition and process parameters: platinum salt content of 10g / L in terms of platinum, sulfamic acid 80g / L, ammonium sulfamate 25g / L, pH=4.0, temperature 40°C, cathode current density 1.5A / cm 2 Bipolar plate technical parameters: flow channel width and depth are 1.5mm, nickel layer thickness is 50 μm, the particle size of platinum alloy is 5nm, and the volume resistivity of 3mm thick bipolar plate is 5.0 μΩ.cm; Others are the same as embodiment 1.

Embodiment 3

[0015] Electrodeposited nickel solution composition and process parameters: nickel sulfate heptahydrate 180g / L, sodium chloride 10g / L, boric acid 30g / L, magnesium sulfate heptahydrate 30g / L, pH=3.5, temperature 20°C, cathode current density 1.0 A / dm 2 ; Platinum electrodeposition solution composition and process parameters: platinum salt content 8g / L in terms of platinum, sulfamic acid 50g / L, ammonium sulfamate 20g / L, pH=1.5, temperature 45°C, cathode current density 1.0A / cm 2 ; Bipolar plate technical parameters: the width and depth of the flow channel are 1.0mm, the thickness of the nickel layer is 40μm, the particle size of the platinum alloy is 2nm, and the volume resistivity of the 3mm thick bipolar plate is 4.95~5.0μΩ.cm; others are the same as in the embodiment 1.

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Abstract

This invention relates to a method for preparing aluminum alloy double pole plate with catalytic function for proton exchange membrane fuel cell, that is as follows: take aluminum alloy as the substrate material, use computer carving method for preparation of flow field, carries on superficial modification processing to aluminum alloy through electric deposition of nickel, electric deposition of platinum and combine nickel to form platinum alloy catalyst with the nickel. Advantages: the double pole plate and the catalyst are organically united together to one body, the double pole plate has catalytic effect, reduced battery modules and contact resistance and the enhanced electric contact reliability.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of an aluminum alloy bipolar plate with a catalytic effect for a proton exchange membrane fuel cell. Background technique [0002] The proton exchange membrane fuel cell has become a hot spot in the research and development of fuel cells due to its outstanding advantages such as low operating temperature, fast start-up, no corrosion, no fear of vibration, high energy density and easy adjustment of output power. The bipolar plate, catalyst and proton exchange membrane three The high price of large components limits the popularization and application of proton exchange membrane fuel cells. At present, bipolar plates are made of carbon plates, graphite-resin, stainless steel and other materials, mainly considering electrical conductivity and mechanical strength, and none of them have catalytic properties. Considering factors such as electrical co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M4/88H01M8/0297
CPCY02E60/50
Inventor 管从胜秦敬玉孙从征
Owner SHANDONG UNIV
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