文章基本信息

标题：Graphene-Co3O4 nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
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作者：Yufei Zhao ; Shuangqiang Chen ; Bing Sun 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep07629
语种：English
出版社：Springer Nature
摘要：Graphene-Co₃O₄ composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses confirmed that Co₃O₄ nanocrystals were homogeneously distributed on both sides of graphene nanosheets. The obtained composite shows enhanced catalytic activities in both alkaline and neutral electrolytes. The onset potential towards the oxygen evolution reaction is 0.406 V ( vs . Ag/AgCl) in 1 M KOH solution, and 0.858 V ( vs . Ag/AgCl) in neutral phosphate buffer solution (PBS), respectively. The current density of 10 mA/cm² has been achieved at the overpotential of 313 mV in 1 M KOH and 498 mV in PBS. The graphene-Co₃O₄ composite also exhibited an excellent stability in both alkaline and neutral electrolytes. In particular, no obvious current density decay was observed after 10 hours testing in alkaline solution and the morphology of the material was well maintained, which could be ascribed to the synergistic effect of combining Co₃O₄ and graphene.