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Method for preparing fuel cell gas diffusion layer base material

A technology of gas diffusion layer and matrix material, which is applied in the direction of fuel cells, solid electrolyte fuel cells, electrical components, etc., can solve the problem of unsatisfactory performance of polymer electrolyte membrane fuel cells, unsatisfactory oxidation resistance and strength performance, and intolerant Electrochemical corrosion and other problems, to achieve the effect of excellent gas permeability performance, improved plating penetration performance, and improved surface roughness

Active Publication Date: 2022-03-25
NAT ENG RES CENT OF ADVANCED ENERGY STORAGE MATERIALS SHEN ZHEN LTD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal conductivity, electrical resistance, and strength of carbon fiber paper and carbon fiber cloth cannot meet the continuous improvement requirements of polymer electrolyte membrane fuel cells. It is necessary to find a suitable material to replace carbon fiber paper or carbon fiber cloth.
Porous metal materials such as porous nickel, etc., have lower resistance and better thermal conductivity than carbon fibers, but they are not resistant to electrochemical corrosion, oxidation resistance and strength properties are still not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of a polymer electrolyte membrane fuel cell gas diffusion layer base material, the steps are as follows:

[0017] Step (1): Place the nano-sponge with a thickness of 0.5 mm, a wire diameter of 6.5 μm, and an average pore diameter of 40 μm in a tank equipped with an electroless nickel plating solution, supplemented by ultrasonic waves with an adjustable frequency at a frequency of 15 to 18 KHz, Electroless nickel plating for 5 minutes; wherein in the electroless nickel plating solution, the concentration of nickel sulfate is 35g / L, the concentration of sodium citrate is 25g / L, the concentration of sodium hypophosphite is 50g / L, and the concentration of lactic acid is 4mL / L L, the concentration of sodium thiosulfate is 3g / L, the pH value of the electroless nickel plating solution is controlled to be 8.0, and the temperature of the electroless nickel plating solution is controlled to be 60°C.

[0018] Step (2): The conductively treated sponge base mate...

Embodiment 2

[0027] A preparation method of a polymer electrolyte membrane fuel cell gas diffusion layer base material, the steps are as follows:

[0028] Step (1): Place a nano-sponge with a thickness of 0.5 mm, a wire diameter of 5 μm, and an average pore diameter of 50 μm in a tank equipped with an electroless nickel plating solution, supplemented by ultrasonic waves with an adjustable frequency at a frequency of 15-18KHz, chemical Nickel plating for 5 minutes; wherein in the electroless nickel plating solution, the concentration of nickel sulfate is 35g / L, the concentration of sodium citrate is 25g / L, the concentration of sodium hypophosphite is 50g / L, and the concentration of lactic acid is 4mL / L , the concentration of sodium thiosulfate is 3g / L, the pH value of the electroless nickel plating solution is controlled to be 8.0, and the temperature of the electroless nickel plating solution is controlled to be 65°C.

[0029] Step (2): The conductively treated sponge base material prepare...

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Abstract

The present invention provides a method for preparing a base material for a gas diffusion layer of a fuel cell. On a polyurethane sponge, conductive--electroplating--electrolytic nickel-dissolving-heat-treatment-electroplating nickel-tungsten--heat-treatment-rolling suppressed. The mass content of metal nickel of the base material is 88-92%, and the mass content of metal tungsten is 8-12%. The material prepared by the invention has high specific surface area, excellent thermal conductivity and gas permeability, excellent electrical corrosion resistance and oxidation resistance. Close contact, can effectively resist the electrochemical corrosion of the diffusion layer caused by the electrochemical reaction, and is suitable for use as the base material of the gas diffusion layer. The method of the invention adopts the method of electrolysis-heat treatment to roughen the surface of the material, and the roughness of the product can be controlled by the dissolution time; the electroless plating process assisted by ultrasonic waves at a lower frequency can greatly improve the conductive sponge. The penetration performance of nickel electroplating, the nickel coating of the material is more uniform.

Description

technical field [0001] The invention relates to a method for preparing a material that can be used in a fuel cell, in particular to a method for preparing a base material that can be used for a gas diffusion layer of a membrane fuel cell. Background technique [0002] Carbon fiber paper or carbon fiber cloth is generally used as the matrix material of the gas diffusion layer of polymer electrolyte membrane fuel cells. Carbon fiber cloth and carbon fiber paper are characterized by light weight and large porosity, and are mainly monopolized by manufacturers such as Toray in Japan and Ballard in Canada. However, the thermal conductivity, electrical resistance, and strength of carbon fiber paper and carbon fiber cloth still cannot meet the continuous improvement requirements of polymer electrolyte membrane fuel cells. It is necessary to find a suitable material to replace carbon fiber paper or carbon fiber cloth. Porous metal materials such as porous nickel, etc., have lower res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M8/10C25D3/12C25D5/56C25D5/14C23C18/36C23C28/02C25D5/50C25D3/56
CPCH01M4/8807H01M8/10C25D3/12C25D5/56C25D5/14C23C18/36C23C28/023C25D5/50C25D3/562H01M2008/1095Y02E60/10H01M4/8605H01M4/88H01M4/0452H01M4/8657H01M4/8853H01M4/905H01M4/9075H01M8/1004H01M8/1055H01M8/1067H01M8/1088H01M2300/0094
Inventor 钟发平肖进春李建奇符长平黄小兵
Owner NAT ENG RES CENT OF ADVANCED ENERGY STORAGE MATERIALS SHEN ZHEN LTD CO
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