Optimization of titanium alloy bipolar plate performance in proton exchange membrane water electrolysis with Cr/W/diamond-like carbon coating

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Thin Solid Films Pub Date : 2024-11-15 DOI:10.1016/j.tsf.2024.140580

Xiaoyu Gong , Shaolong Wang , Xiejing Luo , Anqing Fu , Chaofang Dong

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Abstract

The operating environment for bipolar plates in proton exchange membrane water electrolysis (PEMWE) systems is highly challenging, characterized by high electrical potential, acidic pH, and elevated temperatures. Bipolar plates must possess high corrosion resistance and electrical conductivity to ensure stable and efficient system perfomance. Therefore, surface coatings are essential to decelerate oxidation on the substrate surface, preventing a significant increase in interfacial contact resistance (ICR). This investigation applied a Cr/W/diamond-like carbon (DLC) coating to titanium alloy (Ti-6Al-4 V, also known as TC4) surfaces using magnetron sputtering. The multilayer coating system was designed to enhance electrical conductivity and corrosion resistance of the bipolar plate while ensuring good coating adhesion. At potentials of 1.2 V, 1.5 V, and 1.8 V, the current densities measured during potentiostatic polarization were 0.11 μA·cm^-2, 0.19 μA·cm^-2, and 0.4 μA·cm^-2, respectively, showing a significant reduction compared to the TC4 matrix and demonstrating long-term stability. The Cr/W/DLC-coated TC4 bipolar plates exhibited an ICR of 16.98 mΩ/cm² under a contact pressure of 1.4 MPa. These results suggest that the coating provides exceptional corrosion resistance under PEMWE operating conditions while retaining electrical conductivity.

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Cr/W/类金刚石碳涂层质子交换膜电解钛合金双极板性能优化

质子交换膜电解（PEMWE）系统中双极板的操作环境极具挑战性，其特点是高电位、酸性pH值和高温。双极板必须具有高的耐腐蚀性和导电性，以确保稳定和高效的系统性能。因此，表面涂层对于减缓基材表面的氧化，防止界面接触电阻（ICR）的显著增加至关重要。本研究采用磁控溅射技术在钛合金（ti - 6al - 4v，也称为TC4）表面镀上Cr/W/类金刚石（DLC）涂层。多层涂层体系旨在提高双极板的导电性和耐腐蚀性，同时保证涂层的良好附着力。在1.2 V、1.5 V和1.8 V电位下，恒电位极化过程中测得的电流密度分别为0.11 μA·cm-2、0.19 μA·cm-2和0.4 μA·cm-2，与TC4基体相比，电流密度显著降低，且具有长期稳定性。在接触压力为1.4 MPa时，Cr/W/ dlc涂层TC4双极板的ICR为16.98 mΩ/cm2。这些结果表明，该涂层在PEMWE操作条件下具有优异的耐腐蚀性，同时保持导电性。

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

Thin Solid Films 工程技术-材料科学：膜

CiteScore

4.00

自引率

4.80%

发文量

381

审稿时长

7.5 months

期刊介绍： Thin Solid Films is an international journal which serves scientists and engineers working in the fields of thin-film synthesis, characterization, and applications. The field of thin films, which can be defined as the confluence of materials science, surface science, and applied physics, has become an identifiable unified discipline of scientific endeavor.