One-step electrodeposition of reduced graphene oxide-amorphous carbon composite coatings for proton exchange membrane fuel cell bipolar plates

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-11-06 DOI:10.1016/j.apsusc.2024.161725

Wei Liu, Wenjing Dong, Likui Guo, Yuan Feng, Naibao Huang, Xiannian Sun

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Abstract

In this paper, a convenient electrodeposition method is proposed to directly fabricate a reduced graphene oxide-amorphous carbon composite coating (rGO-ACC) on a 316L stainless steel substrate. The rGO-ACC coating is achieved through a one-step reduction by utilizing a choline chloride-ethylene glycol deep eutectic solvent (DES) with the dispersion of graphene oxide. The analysis results from SEM, Raman and XPS reveal that the obtained rGO-ACC coating, with layered wrinkle morphology, uniformly covers and covalently bonds to 316L stainless steel substrate. Potentiodynamic and potentiostatic polarization tests showed that the corrosion current densities of rGO-ACC coated 316L stainless steel were of the order of 10^-7 A cm⁻² in simulated proton exchange membrane fuel cells (PEMFC) working environment, indicating a significant improvement of corrosion resistance of 316L and an excellent electrochemical stability. Meanwhile, compared with the naked 316L steel, the interfacial contact resistance (ICR) of the coated stainless steel is significantly reduced due to the outstanding electrical conductivity of the coated rGO. The results manifested that deposited rGO-ACC on steel surface may be a highly promising modification method for PEMFC metal bipolar plates.

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用于质子交换膜燃料电池双极板的还原氧化石墨烯-无定形碳复合涂层的一步式电沉积

本文提出了一种便捷的电沉积方法，可在 316L 不锈钢基底上直接制备还原氧化石墨烯-非晶碳复合涂层（rGO-ACC）。利用氯化胆碱-乙二醇深共晶溶剂（DES）分散氧化石墨烯，通过一步还原实现了 rGO-ACC 涂层。扫描电镜、拉曼和 XPS 分析结果表明，所获得的 rGO-ACC 涂层具有分层皱纹形态，可均匀覆盖 316L 不锈钢基底并与之共价键合。在模拟质子交换膜燃料电池（PEMFC）工作环境下，电位动力和电位静态极化测试表明，rGO-ACC 涂层 316L 不锈钢的腐蚀电流密度为 10-7 A cm-2 量级，表明 316L 不锈钢的耐腐蚀性能显著提高，电化学稳定性极佳。同时，与裸316L钢相比，由于涂覆的rGO具有出色的导电性，涂覆不锈钢的界面接触电阻（ICR）显著降低。研究结果表明，在钢表面沉积 rGO-ACC 可能是一种非常有前景的 PEMFC 金属双极板改性方法。

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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.