Improving the corrosion resistance and conductivity of 316L bipolar plates used for PEMFCs by applying Cr/CrN multilayer coating

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Applied Surface Science Pub Date : 2025-01-30 DOI:10.1016/j.apsusc.2025.162573

Qiang Chen, Mingxu Su, Guodong Pang, Qiong Zhou, Dandan Liang, Ergeng Zhang

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Abstract

Cr/CrN/Cr and CrN/Cr/CrN multilayer coatings, as well as CrN monolayer coating, were successfully prepared on 316L stainless steel by cathodic arc technique, and their corrosion resistance and conductivity were systematically investigated in simulated proton exchange membrane fuel cells (PEMFCs) environment. As a result, CrN/Cr/CrN and CrN coatings perform better corrosion resistance and durability than Cr/CrN/Cr coating. This is attributed to the superior chemical inertness and high compactness of CrN, which can block the penetration of the electrode effectively. All the coatings perform p-type semiconductors owing to the chromium oxides, and CrN/Cr/CrN coating shows the lowest acceptor density (N_A) owing to limited carrier transport caused by the interface effects between layers. Moreover, CrN/Cr/CrN coating has the lowest interfacial contact resistance (ICR) after PSP tests, which is attributed to the good corrosion resistance of the outer CrN layer and the inner Cr layer with high electron mobility. This finding proves the potential application of Cr/CrN multilayer coating in PEMFCs.

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.