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Porous Cobalt-Nickel Hydroxide Nanosheets with Active Cobalt Ions for Overall Water Splitting

机译:多孔钴 - 氢氧化镍纳米片,具有用于整体水分裂的活性钴离子

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摘要

Low-cost and high-performance catalysts are of great significance for electrochemical water splitting. Here, it is reported that a laser-synthesized catalyst, porous Co_(0.75)Ni_(0.25)(OH)_2 nanosheets, is highly active for catalyzing overall water splitting. The porous nanosheets exhibit low overpotentials for hydrogen evolution reaction (95 mV@10 mA cm~(-2)) and oxygen evolution reaction (235 mV@10 mA cm~(-2)). As both anode and cathode catalysts, the porous nanosheets achieve a current density of 10 mA cm~(-2) at an external voltage of 1.56 V, which is much lower than that of commercial Ir/C-Pt/C couple (1.62 V). Experimental and theoretical investigations reveal that numerous Co~(3+) ions are generated on the pore wall of nanosheets, and the unique atomic structure around Co~(3+) ions leads to appropriate electronic structure and adsorption energy of intermediates, thus accelerating hydrogen and oxygen evolution.
机译:低成本和高性能催化剂对电化学水分裂具有重要意义。 这里,据报道,激光合成催化剂,多孔CO_(0.75)Ni_(0.25)(OH)_2纳米晶片,对于催化整个水分裂,高度活性。 多孔纳米型表现出用于氢进化反应的低过电位(95mV @ 10 mA cm〜(-2))和氧进化反应(235mV @ 10 mA cm〜(-2))。 作为阳极和阴极催化剂,多孔纳米电池在1.56V的外部电压下实现10 mA cm〜(-2)的电流密度远低于商业IR / C-PT / C夫妇(1.62V )。 实验和理论研究表明,在纳米片的孔隙壁上产生了许多CO〜(3+)离子,CO〜(3+)离子周围的独特原子结构导致适当的电子结构和中间体的吸附能量,从而加速氢气 和氧气进化。

著录项

  • 来源
    《Small》 |2019年第8期|共9页
  • 作者单位

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

    Institute of New Energy Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    cobalt-nickel hydroxide; overall water splitting; porous nanosheets; trivalent cobalt ions;

    机译:氢钴氢氧化物;整体水分裂;多孔纳米蛋白酶;三价钴离子;

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