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Preparation method of surface composite coating based on metal bipolar plate of proton exchange membrane fuel cell

A metal bipolar plate, proton exchange membrane technology, applied in fuel cell parts, fuel cells, coatings, etc., can solve the problems of unfavorable proton exchange membrane fuel cell performance, fast coating performance decay rate, and large surface contact resistance. and other problems, to achieve the effect of promoting the commercialization process, the preparation method is simple, and the surface contact resistance is reduced.

Pending Publication Date: 2019-10-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The noble metal coating has strong corrosion resistance and high electrical conductivity, but the performance decay rate of the coating is fast, and the bonding force with the metal substrate is weak. At the same time, the high cost of the noble metal coating also limits its development; the carbonyl coating is due to its surface The contact resistance is large, which is not conducive to the improvement of the performance of the proton exchange membrane fuel cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: at 0.05mol L -1 Pyrrole, 0.1mol L -1 Hydrochloric acid and 1g L -1 Carbon powder-doped polypyrrole smart composite coating was prepared on the surface of stainless steel by cyclic voltammetry in the electropolymerization solution of carbon powder. The scanning voltage range of cyclic voltammetry was -0.5~0.9V, and the scanning rate was 20mV s -1 , and the number of scanning circles was 30 circles, and the obtained coating was put into a 60° C. vacuum oven for heating and curing for 4 hours to prepare a carbon powder-doped polypyrrole intelligent composite coating. Compared with the blank stainless steel corrosion current density 7.07×10 -5 A cm -2 , The corrosion current density of stainless steel modified by carbon powder-doped polypyrrole intelligent composite coating is 9.25×10 -7 Acm -2 . Compared with blank stainless steel surface contact resistance 351mΩcm -2 , The surface contact resistance of stainless steel modified by carbon powder doped p...

Embodiment 2

[0026] Embodiment 2: at 0.1mol L -1 Pyrrole, 0.3mol L -1 Oxalic acid and 0.5g L -1Carbon powder-doped polypyrrole intelligent composite coating was prepared on the surface of aluminum alloy by constant potential method in the electropolymerization solution of carbon powder. The applied voltage of constant potential method was 1V, and the deposition time was 10min. Heat and cure for 4 hours in a drying oven to prepare a carbon powder-doped polypyrrole smart composite coating. Compared with the blank aluminum alloy corrosion current density 1.22×10 -4 A cm -2 , The corrosion current density of aluminum alloy modified by carbon powder doped polypyrrole intelligent composite coating is 3.89×10 -5 A cm -2 . Compared with blank aluminum alloy surface contact resistance 128mΩcm -2 , the surface contact resistance of the aluminum alloy modified by the carbon powder-doped polypyrrole intelligent composite coating was reduced to 51mΩcm -2 .

Embodiment 3

[0027] Embodiment 3: at 0.5mol L -1 Pyrrole, 0.5mol L -1 Hydrochloric acid and 0.1g L -1 Carbon powder-doped polyaniline intelligent composite coating was deposited on the copper surface by cyclic voltammetry in the electropolymerization solution of carbon powder. The scanning voltage range of cyclic voltammetry was -0.5~1.2V, and the scanning rate was 50mV s -1 , and the number of scanning circles was 30 circles, and the obtained coating was heated and cured in a vacuum oven at 80° C. for 6 hours to prepare a carbon powder-doped polypyrrole intelligent composite coating. Compared with blank copper corrosion current density 1.76×10 -5 A cm -2 , Copper corrosion current density after modified carbon powder-doped polypyrrole intelligent composite coating is 2.80×10 -7 A cm -2 . Compared with blank copper surface contact resistance 163mΩcm -2 , the contact resistance of the copper surface after modification of the carbon powder-doped polypyrrole intelligent composite coati...

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Abstract

The invention relates to the technical field of fuel cells, and specifically relates to a preparation method of a surface composite coating based on a metal bipolar plate of a proton exchange membranefuel cell. The invention adopts an electrochemical method to deposit a conductive polymer intelligent composite coating doped with carbon powder on the metal surface. The metal bipolar plate, which is modified by the conductive polymer intelligent composite coating doped with carbon powder, of the proton exchange membrane fuel cell has the advantages that the corrosion current density is reduced,the long-term corrosion resistance is greatly improved, and the surface contact resistance is low. Meanwhile, the conductive polymer intelligent composite coating doped with carbon powder has strongadhesion, chemical stability and conductivity on the surface of the metal substrate. The preparation method has the advantages of simple operation, low manufacturing cost, safety, environmental protection and simple and easily obtained synthetic raw materials, and is widely applicable to protecting the metal bipolar plate of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a surface composite coating based on a metal bipolar plate of a proton exchange membrane fuel cell, which is a conductive coating used for corrosion protection of the metal bipolar plate of a proton exchange membrane fuel cell. Construction and application of polymer intelligent composite coating. Background technique [0002] Due to the increasingly serious environmental pollution and the depletion of non-renewable resources, the sustainable development of human beings has been severely challenged. The development of clean, efficient and sustainable new energy technologies has become a very urgent task. Proton exchange membrane fuel cells can directly convert the chemical energy of the reaction of fuel hydrogen and oxygen into electrical energy, and are considered to be one of the most advanced, clean and efficient energy production equipment in the fut...

Claims

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Application Information

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IPC IPC(8): H01M8/021H01M8/0221H01M8/0226H01M8/0228C25D15/00
CPCH01M8/0228H01M8/021H01M8/0221H01M8/0226C25D15/00Y02P70/50Y02E60/50
Inventor 杨文忠陈智豪尹晓爽刘瑛陈云
Owner NANJING UNIV OF TECH
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