| JIANG Xiao,LI Wei,LIU Yulai,LI Xiulan,ZHOU Xinjun,WANG Yong.Research Status and Development of Surface Modification of PEMFC Aluminium Alloy Bipolar Plate[J],53(12):81-92, 134 |
| Research Status and Development of Surface Modification of PEMFC Aluminium Alloy Bipolar Plate |
| Received:July 28, 2023 Revised:October 21, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.12.006 |
| KeyWord:proton exchange membrane fuel cell aluminum alloy bipolar plate surface modification metal coatings non-metal coatings |
| Author | Institution |
| JIANG Xiao |
School of Mechanical Engineering, Sichuan University of Science and Engineering, Sichuan Yibin , China |
| LI Wei |
School of Mechanical Engineering, Sichuan University of Science and Engineering, Sichuan Yibin , China |
| LIU Yulai |
Xi'an Chang-feng Electromechanical Research Institute, Xi'an , China |
| LI Xiulan |
School of Mechanical Engineering, Sichuan University of Science and Engineering, Sichuan Yibin , China;Xi'an Chang-feng Electromechanical Research Institute, Xi'an , China |
| ZHOU Xinjun |
School of Mechanical Engineering, Sichuan University of Science and Engineering, Sichuan Yibin , China |
| WANG Yong |
School of Mechanical Engineering, Sichuan University of Science and Engineering, Sichuan Yibin , China |
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| Abstract: |
| As the fifth generation of new energy cells, the Proton Exchange Membrane Fuel Cell (PEMFC) is the most promising cell with advantages of higher conversion rates and zero pollution, and is considered to be one of the most desirable green energy sources and an ideal motive component for future new energy vehicles. As one of the most important components of the PEMFC, the bipolar plate not only connects individual cells of the cell stack and plays a supporting role, but also provides a gas flow path, isolates the cathode and anode ends, transfers current and removes heat and reaction product water, which is particularly important to the working performance and service life of the PEMFC. In this paper, different bipolar plates are introduced. Graphite bipolar plate is the most used bipolar plate material due to its high electrical conductivity and corrosion resistance, but it is gradually replaced because of its high brittleness and processing difficulties, which limits its commercial development. Compared with graphite, metal bipolar plate is cheaper and easier to manufacture. As a common non-ferrous material with good electrical conductivity, low cost, light weight and ease of forming, aluminium alloy is often used as the base material for metal bipolar plate. However, the aluminium bipolar plate has poor corrosion resistance and is susceptible to corrosion in an operating environment of the PEMFC, producing a passivation film on its surface, which reduces the conductive efficiency of the cell. In addition, the released metal ions can diffuse to other components, causing performance deterioration of the cell. Scholars at home and abroad have explored the contradictory relationship between the corrosion resistance and electrical conductivity of aluminium alloy bipolar plates and found that an effective solution to this problem is to modify the surface of the bipolar plate. This paper briefly described the types of PEMFC materials, the internal environment and the corrosion of aluminium alloy bipolar plates, classifies the surface modification of aluminium alloy bipolar plates in recent years and outlined the performance characteristics of metallic coatings (precious metal, metal nitride carbide, nickel phosphorus metal coatings) and non-metallic coatings (carbon-based coatings, polymer compound coatings). In short, precious metal coatings have excellent electrical conductivity and chemical stability, but the higher price limits it’s commercial development; Metal nitride carbide coatings have good electrical and corrosion resistance and remain stable at higher temperature, using appropriate preparation processes to make effective advantage of it; Nickel phosphorus metal coatings slow down the corrosion of the substrate due to their unique corrosion resistance, while adding other metal elements can improve the chemical performance of the coatings; Carbon-based coatings are widely used for surface modification of bipolar plate due to it’s low cost, and the performance of carbon-based coatings can be improved by changing the ratio of sp2 to sp3 carbon. Polymer compound coatings have good corrosion resistance but poor electrical conductivity and require added compounds to improve it’s performance. Compared with single coating, multilayer composite coatings have better corrosion resistance and electrical conductivity, and can maintain stability in a long working time, which is a hot topic in the future research. It is particularly important to promote the development of aluminium bipolar plates by slowing down the corrosion rate and improving the electrical conductivity and efficiency of the bipolar plates. |
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