Sulfur-Decorated Molybdenum Carbide Catalysts for Enhanced Hydrogen Evolution

Sulfur-Decorated Molybdenum Carbide Catalysts for Enhanced Hydrogen Evolution
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用于增强析氢的硫装饰碳化钼催化剂

DOI:
10.1021/acscatal.5b01803
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发表时间:
2015-10
期刊:
ACS Catal.
影响因子:
--
通讯作者:
Dezhi Wang
Dezhi Wang
中科院分区:
其他
文献类型:
--
作者:
Chengkang Qi;Dezun Zhang;Zhuangzhi Wu;Dezhi Wang

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通过对碳化钼进行硫修饰,首次研制出了一种高效稳定的析氢电催化剂(MoX@Mo2C)。硫的修饰虽然降低了Mo2C基片的电化学活性表面积,并略微增大了阻抗电阻,但其循环频率显著提高,最终的析氢反应活性大大提高。更重要的是,MoX和Mo2C之间存在协同效应,使MoX@Mo2C催化剂表现出良好的活性,其Tafel斜率为44 mV dec-1,是Mo2C基催化剂中最好的记录之一。
A highly active and stable electrocatalyst (MoSx@Mo2C) for hydrogen evolution is developed via the sulfur decoration of molybdenum carbide for the first time. Although the decoration of sulfur reduced the electrochemically active surface area and slightly enlarged the impedance resistance of Mo2C substrates, the turnover frequency was remarkably enhanced, resulting in a great improvement in the final hydrogen evolution reaction activity. More importantly, there is a synergistic effect between MoSx and Mo2C, making the MoSx@Mo2C catalyst exhibit an excellent activity with a small Tafel slope of 44 mV dec–1, which is among the best records for Mo2C-based catalysts.
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