Ni2P/C nanosheets derived from oriented growth Ni-MOF on nickel foam for enhanced electrocatalytic hydrogen evolution
Ni2P/C nanosheets derived from oriented growth Ni-MOF on nickel foam for enhanced electrocatalytic hydrogen evolution
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Ni2P/C 纳米片源自泡沫镍上定向生长的 Ni-MOF，用于增强电催化析氢
DOI：
10.1016/j.jcis.2020.03.068
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发表时间：
2020-07-15
影响因子：
9.9
通讯作者：
Wang, Lei
中科院分区：
文献类型：
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作者：
Qu, Huiqi;Ma, Yiru;Wang, Lei
调整提供具有改进的动力学扩散的电化学活性位点的结构特征可以提供实现电催化的高性能的替代方式。在这里，我们报告了一种纳米结构的Ni 2 P/C（NPC）纳米片支撑在泡沫镍（NF），这是通过顺序的氮气热解和气体磷化的Ni-MOF纳米片制备。最初，镍泡沫的钝化表面有利于Ni-MOF纳米片的定向生长，这对于在随后的热解和磷化处理期间保持结构稳定性至关重要。结果，比非取向NPC催化剂暴露更多的催化活性位点，并且扩散动力学是有利的。因此，所获得的复合物可以在碱性电解质中表现出优异的析氢催化活性。对于析氢反应，在97 mV的过电位下提供10 mA cm（-2）的电流密度，其起始过电位仅为29 mV。同时，在12 h的稳定性测试后，仍能保持良好的形貌和催化活性。这种优异的性能被认为是源自棱柱状Ni-MOF的小面取向控制的NF上的NPC纳米片结构的结果，从而实现优异的反应动力学。(C)2020爱思唯尔公司All rights reserved.
Tuning the structural features that furnish electrochemically active sites with improved kinetic diffusion can provide an alternative way to achieve high performance of electrocatalysis. Here, we report a nanostructure of Ni2P/C(NPC) nano-sheets supported on nickel foam (NF) that is prepared by sequenced nitrogen pyrolysis and gas phosphatization of Ni-MOF nanosheets. Initially, the passivated surface of nickel foam facilitates the oriented growth of Ni-MOF nanosheets, which is crucial for the maintenance of structure stability during the subsequent pyrolysis and phosphatization treatment. As a result, more catalytic active sites are exposed than the non-oriented NPC catalysts and diffusion kinetics is favorable. Consequently, the obtained composite can exhibit excellent hydrogen evolution catalytic activity in an alkaline electrolyte. For hydrogen evolution reaction, a current density of 10 mA cm(-2) is provided at an overpotential of 97 mV and its onset overpotential is only 29 mV. Meanwhile, good morphology and catalytic activity can be maintained after 12 h of stability testing. This excellent performance is believed to be the result of NPC nanosheet structure on NF derived from the facet-oriented control of pris-tine Ni-MOF, enabling excellent reaction kinetics. (C) 2020 Elsevier Inc. All rights reserved.