Enhanced corrosion resistance of titanium bipolar plates for PEMFC by N/Ti co-doped a-C pseudo-multilayer coating

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-05-18 DOI:10.1016/j.diamond.2025.112463

Zhengde Wang , Jin Li , Jianxiang Lv , Bin Zhang

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Abstract

As a key component of PEMFC, the Ti bipolar plates exhibit unsatisfactory corrosion resistance and surface electric conductivity under operating conditions. Herein, a N/Ti co-doped a-C pseudo-multilayer coating was successfully deposited on Ti bipolar plates using our home-made PVD system. Such modified Ti bipolar plates fully comply with the DOE 2025 target for PEMFC. We attributed the excellent performance to the unique pseudo-multilayer coating, which maintains structural continuity without noticeable delamination, featuring a dense microstructure and exceptional corrosion resistance. Moreover, the injection of N₂ not only reduced the sputtering yield of Ti target but also facilitated the transition from sp² to sp³ hybridization state in a-C and the conversion of TiC to TiN bonds, consequently improving the coating's corrosion resistance and durability. Our work provides an effective coating strategy to enhance both corrosion resistance and electrical conductivity of Ti bipolar plates.

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N/Ti共掺a-C伪多层涂层增强PEMFC用钛双极板的耐蚀性

作为PEMFC的关键部件，Ti双极板在工作条件下的耐腐蚀性和表面导电性不理想。利用自制的PVD系统，成功地在Ti双极板上沉积了N/Ti共掺杂的a- c伪多层涂层。这种改进的钛双极板完全符合美国能源部2025年PEMFC的目标。我们将优异的性能归功于独特的伪多层涂层，它保持了结构的连续性，没有明显的分层，具有致密的微观结构和优异的耐腐蚀性。此外，注入N2不仅降低了Ti靶材的溅射率，还促进了a-C中sp2到sp3杂化态的转变以及TiC键向TiN键的转化，从而提高了涂层的耐蚀性和耐久性。我们的工作提供了一种有效的涂层策略来提高钛双极板的耐腐蚀性和导电性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.