Fe, Co, and Ni ions promote the catalytic activity of amorphous molybdenum sulfide films for hydrogen evolution
Fe, Co, and Ni ions promote the catalytic activity of amorphous molybdenum sulfide films for hydrogen evolution
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DOI：
10.1039/c2sc20539d
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发表时间：
2012-01-01
期刊：
影响因子：
8.4
通讯作者：
Hu, Xile
中科院分区：
文献类型：
--
作者：
Merki, Daniel;Vrubel, Heron;Hu, Xile
硫化钼材料已被认为是一种很有前途的非贵金属析氢催化剂。本文研究了某些过渡金属离子对非晶态MoS_3薄膜活性的促进作用。用循环伏安法在含MCl2和(NH4)(2)[MoS4]的水溶液中制备了M-MoS3(M=Mn，Fe，Co，Ni，Cu，Zn)三元金属硫化物薄膜。而锰、铜和锌-MoS3膜的催化活性与MoS3膜相似或仅略高，而Fe-、Co-和Ni-MoS3膜的催化活性明显高于MoS3膜。Fe、Co、Ni离子在酸性和中性条件下都有促进作用，但在中性条件下促进作用更明显。在pH=7时，交换电流密度增加了12倍，过电位为150 mV时，电流密度增加了10倍。结果表明，Fe、Co和Ni离子促进了MoS3薄膜的生长，使其具有较高的比表面积和较高的催化剂负载量。这些变化是pH=0时酶活性增强的主要原因。然而，在pH=7时，Fe、Co和Ni离子似乎也增加了MoS3薄膜的本征活性。
Molybdenum sulfide materials have been shown as promising non-precious catalysts for hydrogen evolution. This paper describes the study of the promotional effects of certain transition metal ions on the activity of amorphous MoS3 films. Ternary metal sulfide films, M-MoS3 (M = Mn, Fe, Co, Ni, Cu, Zn), have been prepared by cyclic voltammetry of aqueous solutions containing MCl2 and (NH4)(2)[MoS4]. Whereas the Mn-, Cu-, and Zn-MoS3 films show similar or only slightly higher catalytic activity as the MoS3 film, the Fe-, Co-, and Ni-MoS3 films are significantly more active. The promotional effects of Fe, Co, and Ni ions exist under both acidic and neutral conditions, but the effects are more pronounced under neutral conditions. Up to a 12-fold increase in exchange current density and a 10-fold increase in the current density at an overpotential of 150 mV are observed at pH = 7. It is shown that Fe, Co, and Ni ions promote the growth of the MoS3 films, resulting a high surface area and a higher catalyst loading. These changes are the main contributors to the enhanced activity at pH = 0. However, at pH = 7, Fe, Co, and Ni ions appear to also increase the intrinsic activity of the MoS3 film.