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CoOOH Nanosheets with High Mass Activity for Water Oxidation

  • [设施]:合肥光源
  • [期刊/会议名称]:Angewandte Chemie-International Edition
  • [摘要]:Endowing transition-metal oxide electrocatalysts with high water oxidation activity is greatly desired for production of clean and sustainable chemical fuels. Here, we present an atomically thin cobalt oxyhydroxide (-CoOOH) nanosheet as an efficient electrocatalyst for water oxidation. The 1.4nm thick -CoOOH nanosheet electrocatalyst can effectively oxidize water with extraordinarily large mass activities of 66.6Ag(-1), 20 times higher than that of -CoOOH bulk and 2.4 times higher than that of the benchmarking IrO2 electrocatalyst. Experimental characterizations and first-principles calculations provide solid evidence to the half-metallic nature of the as-prepared nanosheets with local structure distortion of the surface CoO6-x octahedron. This greatly enhances the electrophilicity of H2O and facilitates the interfacial electron transfer between Co ions and adsorbed -OOH species to form O-2, resulting in the high electrocatalytic activity of layered CoOOH for water oxidation.
  • [发表日期]:2015
  • [第一作者]:黄均衡
  • [第一作者单位]:中国科学技术大学 国家同步辐射实验室
  • [通讯作者]:刘庆华 韦世强
  • [通讯作者单位]:中国科学技术大学 国家同步辐射实验室
  • [论文类型]:期刊
  • [期刊分类]:
  • [学科分类]:化学
  • [影响因子]:11.336
  • [关键词]:electrocatalysis; half-metallic; water oxidation; XAFS; -CoOOH nanosheets
  • [卷号]:30
  • [期号]:54
  • [起止页码]:8722-8727
  • [简介]: