Comparative study on MoS2 and WS2 for electrocatalytic water splitting
Comparative study on MoS2 and WS2 for electrocatalytic water splitting
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DOI：
10.1016/j.ijhydene.2013.07.021
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发表时间：
2013-09-19
影响因子：
7.2
通讯作者：
Li, Lain-Jong
中科院分区：
文献类型：
--
作者：
Chen, Tzu-Yin;Chang, Yung-Huang;Li, Lain-Jong
用储量丰富的地球元素催化剂替代铂是实现潜在大规模析氢反应（HER）应用的最重要任务之一。在众多潜在的候选材料中，低成本且地球储量丰富的过渡金属二硫化物，如二硫化钼（MoS₂）和二硫化钨（WS₂），当被设计成具有活性位点的结构时，有望成为良好的析氢电催化剂。在这项工作中，我们对分别由（NH₄）₂WS₄和（NH₄）₂MoS₄前驱体通过一步且可规模化的热分解法制备的二硫化钼和二硫化钨材料的催化活性进行了系统研究。结构分析表明，在较高热分解温度下制备的这些材料具有更高的结晶度。在较低温度下制备的二硫化钼的析氢电催化效率高于在较高温度下制备的，其中无定形的二硫化钼或S₂²⁻物种而非结晶态的二硫化钼是主要的活性位点。相比之下，在高温下制备的结晶态二硫化钨被确定为关键的反应位点。这两种催化剂在酸性电解质中作为电催化剂都表现出优异的效率和耐久性。这项工作为进一步设计和制备新兴的金属二硫化物催化剂提供了基本的见解，有利于清洁能源的发展。版权所有（C）2013，氢能出版社有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Replacing Pt by earth abundant catalysts is one of the most important tasks toward potential large-scale HER applications. Among many potential candidates, low cost and earth abundant transition metal dichalcogenides such as MoS2 and WS2 have been promising as good H-2 evolution electrocatalysts when they are engineered into the structures with active sites. In this work, we have performed systematic studies on the catalytic reactivity of both MoS2 and WS2 materials produced by one-step and scalable thermolysis from (NH4)(2)WS4 and (NH4)(2)MoS4 precursors respectively. Structural analysis shows that these materials prepared at a higher thermolysis temperature exhibit higher crystallinity. The H-2 evolution electrocatalysts efficiency for the MoS2 prepared at a lower temperature is higher than those at higher temperatures, where amorphous MoS2 or S-2(2-) species instead of crystalline MoS2 is the main active site. By contrast, crystalline WS2 prepared at high temperature is identified to be the key reaction site. Both catalysts display excellent efficiency and durability as an electrocatalyst operating in acidic electrolytes. This work provides fundamental insights for further design and preparation of emergent metal dichalcogenide catalysts, beneficial for the development in clean energy. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.