Thermal Sprayed Protective Coatings for Bipolar Plates of Hydrogen Fuel Cells and Water Electrolysis Cells

Author:

Liu Tao1,Tao Youkun1ORCID,Wang Yanli1,Wu Mingfeng2,Zhang Jin1,Yu Yang3ORCID,Wang Xingfu4,Shao Jing2

Affiliation:

1. School of Science, Harbin Institute of Technology, Shenzhen 518055, China

2. College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China

3. Faculty of Materials Science, Shenzhen MSU-BIT University, Shenzhen 518172, China

4. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

Abstract

As one core component in hydrogen fuel cells and water electrolysis cells, bipolar plates (BPs) perform multiple important functions, such as separating the fuel and oxidant flow, providing mechanical support, conducting electricity and heat, connecting the cell units into a stack, etc. On the path toward commercialization, the manufacturing costs of bipolar plates have to be substantially reduced by adopting low-cost and easy-to-process metallic materials (e.g., stainless steel, aluminum or copper). However, these materials are susceptible to electrochemical corrosion under harsh operating conditions, resulting in long-term performance degradation. By means of advanced thermal spraying technologies, protective coatings can be prepared on bipolar plates so as to inhibit oxidation and corrosion. This paper reviews several typical thermal spraying technologies, including atmospheric plasma spraying (APS), vacuum plasma spraying (VPS) and high-velocity oxygen fuel (HVOF) spraying for preparing coatings of bipolar plates, particularly emphasizing the effect of spraying processes on coating effectiveness. The performance of coatings relies not only on the materials as selected or designed but also on the composition and microstructure practically obtained in the spraying process. The temperature and velocity of in-flight particles have a significant impact on coating quality; therefore, precise control over these factors is demanded.

Funder

Shenzhen Government’s Plan of Science and Technology

National Natural Science Foundation of China

Featured Innovation Project of Colleges and Universities of Guangdong Province

Guangdong Basic and Applied Basic Research Foundation

Innovation Team Project of Guangdong Colleges and Universities

Publisher

MDPI AG

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