Enhanced electrocatalytic activity of MoP microparticles for hydrogen evolution by grinding and electrochemical activation
Enhanced electrocatalytic activity of MoP microparticles for hydrogen evolution by grinding and electrochemical activation
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DOI：
10.1039/c4ta06651k
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发表时间：
2015-02
影响因子：
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通讯作者：
Tanyuan Wang;Kuangzhou Du;Wanglian Liu;Zhiwei Zhu;Yuanhua Shao;Meixian Li
中科院分区：
文献类型：
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作者：
Tanyuan Wang;Kuangzhou Du;Wanglian Liu;Zhiwei Zhu;Yuanhua Shao;Meixian Li
CoP、MoP、Ni2P等过渡金属磷化物被认为是析氢反应（HER）的高效催化剂。然而，在制备和长期储存过程中，通常会在这些磷化物的表面形成her惰性氧化物。在本研究中，采用研磨和电化学活化的简单组合方法对长期储存的商用MoP微粒的表面状态进行了调整，由于表面存在钼和磷的氧化物，该微粒对HER的活性较低，导致MoP的活性位点暴露较多，对HER的催化活性增强，其起始电位为0.08 V， Tafel斜率为50 mV dec−1。
Transition metal phosphides like CoP, MoP, Ni2P are suggested to be highly efficient catalysts for hydrogen evolution reaction (HER). However, HER-inert oxides would usually form on the surfaces of these phosphides during preparation and long-term storage. In this study, a simple combination method of grinding and electrochemical activation is used to tune the surface states of long-term stored commercial MoP microparticles, which show low activity for HER due to the molybdenum and phosphorus oxides on the surface, resulting in more exposed active sites of MoP and an enhanced catalytic activity for HER with an onset potential of 0.08 V vs. RHE and a Tafel slope of 50 mV dec−1.