Graphene-doping conductive polymer modified metal bipolar plate of proton exchange membrane fuel cell and preparation method of metal bipolar plate

Abstract

The invention relates to a graphene-doping conductive polymer modified metal bipolar plate of a proton exchange membrane fuel cell and a preparation method of the metal bipolar plate, belonging to the technical field of a fuel cell. The bipolar plate comprises a metal plate, a polarity oxide film layer and a graphene-doping conductive polymer film layer, wherein the polarity oxide film layer covers the surface of the metal plate, the graphene-doping conductive polymer film layer covers the surface of the polarity oxide film layer, and the thickness of the graphene-doping conductive polymer film layer is 0.005-0.3 millimeter, the thickness of the polarity oxide film layer is 5-30 nanometers, and the thickness of the metal plate is 0.1-2 millimeters. A graphene-doping conductive polymer film is deposited on the surface of a stainless steel plate after preprocessing by an electrochemical synthesis method, the metal bipolar plate prepared according to the invention has the advantages of relatively low contact resistance, low corrosion current density and high bonding firmness of the metal substrate and the conductive polymer film, moreover, the method is simple, the processing cost is low, and mass production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a proton exchange membrane fuel cell bipolar plate and a preparation method thereof, more specifically, the invention relates to a graphene-doped conductive polymer modified proton exchange membrane fuel cell metal bipolar plate Pole plate and its preparation method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is the fifth generation fuel cell developed after alkaline fuel cell, phosphoric acid fuel cell, molten carbonate fuel cell and solid oxide fuel cell. Or reformed gas as fuel, air or oxygen as a new type of environmentally friendly fuel cell, is a power generation device that converts the chemical energy in fuel and oxidant into electrical energy. The bipolar plate is the key component of connecting the PEMFC single cells in series to form a battery stack. Its main function is to separate the oxidant and the reductant, collect current, and sep...

AI Technical Summary

Problems solved by technology

[0003] Most of the fuel cells that have been industrialized at present use copper (or silver) gold-plated materials or graphite blocks as bipolar plate materials. They have their own advantages and disadvantages: 1. Copper (or silver) gold-plated materials have very good electrical and thermal conductivity and can Made very thin, light weight

However, due to the high price of silver and gold, it is difficult to reduce the cost of a battery stack composed of multiple PEMFC single cells connected in series

In addition, if the electroplating quality problem occurs during the copper electroplating process, the base material copper is easily oxidized and corroded, which will greatly reduce the battery life.

2. Graphite block material has excellent electrical conductivity and low price, but its thermal conductivity is slightly poor. The most important thing is that the bipolar plate of graphite block cannot be made very thin, which makes multiple PEMFC single cells connected in series to form a battery stack. Volume and weight They are too big to be portable batteries

The inventor's research group of the present invention discloses " graphene-modified polyaniline / stainless steel composite material bipolar plate " in previous research results, and deposits a layer of reduced graphene oxide on polyaniline / stainless steel surface by electrodeposition method ( RGO) film, and the composition of the film and the conductivity and corrosion resistance of the modified bipolar plate were studied. The results showed that the corrosion current density of the modified RGO / polyaniline / stainless steel bipolar plate decreased by an order of magnitude. , and the impedance of the modified bipolar plate is significantly reduced, but the polyaniline layer and the RGO film layer of the bipolar plate prepared by this technology are arranged in layers, which is likely to cause the problem of low bonding firmness between layers , and the RGO film as the outer layer may not be wear-resistant, which will eventually affect the service life of the bipolar plate

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