| ZHAO Meng,ZHOU Hui,GUI Bin-hua,WANG Ke-liang.Research Progress of Surface Modified Carbon-based Coatings for Metal Bipolar Plate[J],52(11):182-199 |
| Research Progress of Surface Modified Carbon-based Coatings for Metal Bipolar Plate |
| Received:October 19, 2022 Revised:February 20, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.11.014 |
| KeyWord:proton exchange membrane fuel cells bipolar plates carbon-based coating PVD corrosion resistance conductivity |
| Author | Institution |
| ZHAO Meng |
Key Laboratory of Vacuum Technology and Physics, Lanzhou Institute of Physics, CAST, Lanzhou , China |
| ZHOU Hui |
Key Laboratory of Vacuum Technology and Physics, Lanzhou Institute of Physics, CAST, Lanzhou , China |
| GUI Bin-hua |
Key Laboratory of Vacuum Technology and Physics, Lanzhou Institute of Physics, CAST, Lanzhou , China |
| WANG Ke-liang |
Key Laboratory of Vacuum Technology and Physics, Lanzhou Institute of Physics, CAST, Lanzhou , China |
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| Abstract: |
| With the increasingly serious problems of energy and environmental pollution, the development of clean energy has become a hot issue. Proton exchange membrane fuel cell has become one of the most promising development directions in this field because of its zero emission, low operating temperature and high energy conversion efficiency. As the core component of proton exchange membrane fuel cell, bipolar plate accounts for 20% -30% of the total manufacturing cost. Its service performance and manufacturing cost have become the key factors restricting the development of fuel cell. The bipolar plate is in a high temperature and acidic corrosion environment for a long time, and has the functions of conductivity, thermal conductivity, distribution of reaction gas and drainage. Therefore, the bipolar plate requires good corrosion resistance, conductivity, hydrophobicity and durability. Although the metal bipolar plate has the advantages of easy processing and low production cost, it is difficult to avoid corrosion in an acidic environment, resulting in a decrease in fuel cell performance and service life. High-performance corrosion-resistant conductive coatings are deposited on the surface of metal bipolar plates with high machinability and low manufacturing cost by surface modification technology, which can significantly improve the service performance of metal bipolar plates. It has become one of the hotspots in the research field of fuel cell bipolar plates in recent years. On the basis of comparing the advantages and disadvantages of three typical metal bipolar plate modified coatings, such as precious metal coating, nitride coating and carbon-based coating, the work points out the development bottleneck of high production cost of precious metal coating and insufficient durability and conductivity of nitride coating. Carbon-based coating was selected as the focus of this work, and the latest research progress of carbon-based coating modified metal bipolar plate material system was expounded. In this work, the key points in the design and preparation of carbon-based coatings were taken as the starting point. The effects of film design, element doping and key process parameters in the preparation technology of carbon-based coatings by PVD technology on the chemical composition, microstructure growth and macroscopic service performance of carbon-based coatings were analyzed, including the inhibition effect of multilayer structure on the growth of coated columnar crystals. The method of doping other elements was used to refine the grain, improve the adhesion between the coating and the substrate, and reduce the internal stress. The effect mechanism of element doping on the properties of carbon-based coatings was studied by theoretical calculation and experiment. The effect of important parameters such as bias voltage, deposition time and gas flow rate on the preparation of carbon-based coatings was investigated. The failure mechanisms of several carbon-based coatings were discussed. The key technical problems to be solved, such as the insufficient service life of most coatings, the inability to meet the service standard of 5 000 hours, the inconsistency of test conditions, and the large gap between the simulated environment and the actual working conditions of the stack, were summarized. At the same time, the further development direction of metal bipolar plate modified carbon-based coatings was also prospected. |
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