Defect Engineering of MoS2 and Its Impacts on Electrocatalytic and Photocatalytic Behavior in Hydrogen Evolution Reactions,Chemistry - An Asian Journal

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Defect Engineering of MoS2 and Its Impacts on Electrocatalytic and Photocatalytic Behavior in Hydrogen Evolution Reactions
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-12-11 , DOI: 10.1002/asia.201801594
Yuxiao Zhang ₁ , Yasutaka Kuwahara _{1,

2} , Kohsuke Mori _{1,

2,

3} , Hiromi Yamashita _{1,

2}

Affiliation

Molybdenum disulfide (MoS₂) has been regarded as a favorable photocatalytic co‐catalyst and efficient hydrogen evolution reaction (HER) electrocatalyst alternative to expensive noble‐metals catalysts, owing to earth‐abundance, proper band gap, high surface area, and fast electron transfer ability. In order to achieve a higher catalytic efficiency, defects strategies such as phase engineering and vacancy introduction are considered as promising methods for natural 2H‐MoS₂ to increase its active sites and promote electron transfer rate. In this study, we report a new two‐step defect engineering process to generate vacancies‐rich hybrid‐phase MoS₂ and to introduce Ru particles at the same time, which includes hydrothermal reaction and a subsequent hydrogen reduction. Compositional and structural properties of the synthesized defects‐rich MoS₂ are investigated by XRD, XPS, XAFS and Raman measurements, and the electrochemical hydrogen evolution reaction performance, as well as photocatalytic hydrogen evolution performance in the ammonia borane dehydrogenation are evaluated. Both catalytic activities are boosted with the increase of defects concentrations in MoS₂, which ascertains that the defects engineering is a promising route to promote catalytic performance of MoS₂.

中文翻译：

MoS2的缺陷工程及其对析氢反应中电催化和光催化行为的影响

二硫化钼（MoS ₂）被认为是一种有利的光催化助催化剂和高效氢析出反应（HER）电催化剂，可替代昂贵的贵金属催化剂，这是由于其地球丰度，适当的带隙，高表面积和快速的电子转移能力。为了获得更高的催化效率，诸如相工程和空位引入等缺陷策略被认为是天然2H-MoS ₂增加其活性位并促进电子转移速率的有前途的方法。在这项研究中，我们报告了一个新的两步缺陷工程过程，以生成空位丰富的混合相MoS ₂并同时引入Ru颗粒，这包括水热反应和随后的氢还原。通过XRD，XPS，XAFS和Raman测量研究了合成的富含缺陷的MoS _2的组成和结构特性，并评估了氨硼烷脱氢中的电化学氢释放反应性能以及光催化氢释放性能。随着MoS ₂中缺陷浓度的增加，两种催化活性都得到增强，这确定了缺陷工程是提高MoS ₂催化性能的有前途的途径。

更新日期：2018-12-11

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