煅烧
过电位
催化作用
材料科学
结晶
碳化物
化学工程
过渡金属
合金
水溶液
降水
金属
无机化学
化学
冶金
物理化学
电化学
有机化学
电极
气象学
工程类
物理
作者
Yajun Zhou,Weimin Huang,Xiaohua Zhang,Min Wang,Lingxia Zhang,Jianlin Shi
标识
DOI:10.1002/chem.201703040
摘要
Abstract Here we report a novel one‐pot approach to synthesize MoC x catalysts at much lowered temperature for hydrogen evolution reaction (HER) in acidic solution. A room‐temperature co‐precipitation reaction among Ni 2+ , MoO 4 2− and 2‐methylimidazole in an aqueous solution produced a Mo−Ni−imidazole complex, which was used as the precursor to fabricate MoC x . The morphological and chemical properties of the obtained MoC x affected by calcination and other additive metal sources (like Fe, Co, Cu) were investigated in detail. We demonstrated that Ni−Mo alloying took place prior to MoC x formation during heating, which catalyzed the crystallization of MoC x at relatively low temperature. The MoC x /Ni‐650 catalyst exhibited a quite low overpotential of 172 mV at 20 mA cm −2 . The high performance originates from the synergistic effect between MoC x and Ni−Mo alloy, high ratio of Mo 3+ /Mo 2+ , as well as high electrochemically active surface area and low charge‐transfer resistance. This work would open a new way to the design and fabrication of other transition‐metal carbide catalysts.
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