Abstract

In this study, electrochemical hydrogen storage properties of graphene coatings were investigated. X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and galvanostatic charge/discharge measurements were used to characterize the materials properties. Graphene oxide was prepared using a modified Hummers method. A graphene coating was fabricated by electrophoretic deposition. Results showed that a graphene-coated copper electrode, as a low-cost and low-weight electrode, has a good charge/discharge capacity that makes it a promising candidate for electrochemical hydrogen storage applications. The highest discharge capacity obtained for a coated electrode was 45 mA h g^–1, while the discharge capacity of a bare copper electrode was only 2 mA h g^–1. A high capacity of the graphene coating is due to defects of the graphene structure such as wrinkles, crumples, etc., and oxygen-functional groups attached to graphene during syntheses process.

中文翻译：

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电泳沉积形成的石墨烯涂层的电化学储氢性能

摘要

在这项研究中，研究了石墨烯涂层的电化学储氢性能。X射线衍射，拉曼光谱，场发射扫描电子显微镜和恒流充电/放电测量被用来表征材料的特性。使用改良的Hummers方法制备氧化石墨烯。通过电泳沉积制备石墨烯涂层。结果表明，石墨烯涂层的铜电极作为一种低成本，重量轻的电极，具有良好的充放电容量，使其成为电化学储氢应用的有希望的候选者。涂层电极的最高放电容量为45 mA h g ^–1，而裸铜电极的放电容量仅为2 mA h g ^–1。石墨烯涂层的高容量归因于石墨烯结构的缺陷，例如皱纹，皱褶等，以及在合成过程中附着于石墨烯的氧官能团。