| WU Xinyu,LIU Ruiliang,WU Zhaojie.Research Progress of Thermal Diffusion Technology in Surface Modification of Metallic Bipolar Plate[J],53(18):1-15 |
| Research Progress of Thermal Diffusion Technology in Surface Modification of Metallic Bipolar Plate |
| Received:December 03, 2023 Revised:April 15, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.18.001 |
| KeyWord:metallic bipolar plates thermal diffusion surface modification corrosion resistance interfacial contact resistance |
| Author | Institution |
| WU Xinyu |
Key Laboratory of Ultra-light Materials and Surface Technology of Ministry of Education, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
| LIU Ruiliang |
Key Laboratory of Ultra-light Materials and Surface Technology of Ministry of Education, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
| WU Zhaojie |
Key Laboratory of Ultra-light Materials and Surface Technology of Ministry of Education, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
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| Abstract: |
| Fuel cells have attracted much attention in recent years due to their environmental protection and high resource utilization advantages, which are of great significance to improving the global environment. Bipolar plate is an important part of fuel cells, which isolates oxidants and reducing agents in fuel cells. Electrons generated by the anode have been collected and then conducted to the cathode. They have good electrical conductivity and thermal conductivity; requiring low contact resistance and high corrosion resistance. Therefore, the Department of Energy (DOE) has established relevant performance indicators, which stipulate that bipolar plates can only be used in proton exchange membrane fuel cells when they meet the standards. At present, most of the bipolar plates in fuel cells are graphite bipolar plates, which have large thickness, high processing cost and poor flexibility, while metal bipolar plates are the best material to replace graphite bipolar plates, which are easy to process and low in cost. But in the acidic environment in which fuel cells operate, metal bipolar plates are prone to corrosion, resulting in a reduction in the output efficiency of fuel cells, which seriously affects the application. At present, the preparation of coatings on the surface of metal bipolar plates is the most widely studied. However, most of the coating methods are too complex, easy to form defects, and are too expensive for the commercialization of fuel cells. Therefore, the method of thermal diffusion modification of metal bipolar plates can be used to meet their service performance. This paper introduced different kinds of metal bipolar plates and different surface modification techniques of metal bipolar plates. Different kinds of thermal expansion modification techniques were listed, with a focus on the thermal expansion process, corrosion resistance and conductivity. The analysis results show that for the thermal expansion process, appropriate temperature should be selected when preparing the bipolar plate to reduce or eliminate the influence of deformation on the bipolar plate. The preparation of a uniform, dense and single thermal expansion layer could significantly improve the performance of metal bipolar plates. The oxidation film and passivation film formed in the air and simulated fuel cell solution environment also played an important role in the performance of metal bipolar plates. |
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