| CHEN Dong,DANG Bo,YANG Kai,MENG Xiangle,WEI Dongbo,LI Shuqin,ZHANG Pingze.Research Progress of Transition Metal Nitride Coatings on PEMFC Metal Bipolar Plate[J],54(3):39-61 |
| Research Progress of Transition Metal Nitride Coatings on PEMFC Metal Bipolar Plate |
| Received:April 11, 2024 Revised:June 26, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.03.003 |
| KeyWord:transition metal nitride coating bipolar plate proton exchange membrane fuel cell corrosion resistance conductivity |
| Author | Institution |
| CHEN Dong |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| DANG Bo |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| YANG Kai |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| MENG Xiangle |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| WEI Dongbo |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| LI Shuqin |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHANG Pingze |
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| Bipolar plate is one of key components constituting a proton exchange membrane fuel cell (PEMFC), which has important roles such as thermal and electrical conductivity and distribution of reactive gases, but it is prone to corrosion under acidic working conditions, which affects its long-term stability. Improving its performance by preparing coatings on the surface of metal bipolar plates is a method with great potential. In this paper, firstly, the organizational structures of different kinds of single-layer transition metal nitride coatings are introduced, and the effects of different physical phase compositions on relevant properties of the coatings are investigated. Secondly, the studies related to multilayer coatings as well as heteroatom doped coatings are summarized. Subsequently, the common preparation processes of transition metal nitride coatings are introduced. Finally, the transition metal nitride PEMFC bipolar plate coatings are summarized, and the shortcomings of the current research and future research directions are pointed out. Transition metal nitride (TMN) is a compound formed by doping N elements in transition metal elements (Nb, Cr, Ti, etc.). And its crystal structure, due to the existence of covalent, ionic and metallic bonds, makes it have excellent corrosion resistance, excellent electrical and thermal conductivity and hydrophobicity. So it has a great development prospect in improving the service performance of PEMFC bipolar plates. Transition metal nitride coatings for bipolar plates are categorized into single-layer coatings, multilayer coatings, and heteroatom doped coatings according to their structure design. For single-layer coatings, the microstructure of the coating is affected by the preparation process and the parameters. Especially, the N2 partial pressure significantly affects the physical phase organization of the coating; Multilayer coatings have better corrosion resistance than single-layer coatings due to their periodic structure, which inhibits the generation of columnar crystal holes; Heteroatom doped coatings hinder the growth of columnar crystals through the formation of corrosion-resistant phases from heteroatoms, which improves the corrosion resistance of bipolar plates. At present, surface modification of bipolar plates is still one of the most effective ways to prevent the failure of bipolar plates in long-term operation. The research on transition metal nitride coatings for bipolar plates often focuses on coating elements and structure design, preparation process, and related properties. In the future, on the one hand, the research direction should not only be limited to the common properties such as corrosion resistance, interfacial conductivity, hydrophobicity, etc. of transition metal nitride coatings, and thermal cycling in the actual operating environment of PEMFC is also crucial. It is also necessary for researchers to conduct in-depth analyses and studies on the thermal properties of the bipolar plates; On the other hand, other single-phase transition metal nitride coatings, such as NbN, CrN, TiN, etc., often present a columnar crystal structure. The key to further improve the corrosion resistance of bipolar plates lies in how to hinder the columnar growth of coating grains. Multilayer coatings and heteroatom doped coatings can often inhibit the generation of columnar crystal holes, but multilayer coatings with different elements and crystal structures may lead to galvanic coupling corrosion and a certain amount of stress strain between coatings. Therefore, exploring single-layer noncolumnar crystal coatings or coatings with homogeneous multilayer structures as well as heteroatom-doped coatings will be the main research direction in the future. |
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