Support interactions dictated active edge sites over MoS2-carbon composites for hydrogen evolution.
Support interactions dictated active edge sites over MoS2-carbon composites for hydrogen evolution.
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DOI：
10.1039/c9nr09023a
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发表时间：
2019-12
期刊：
影响因子：
6.7
通讯作者：
Xiaobin Qiu;Yewei Huang;Zhenzhen Nie;Beibei Ma;Yongwen Tan;Zhenjun Wu;N. Zhang;Xiuqiang Xie
中科院分区：
文献类型：
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作者：
Xiaobin Qiu;Yewei Huang;Zhenzhen Nie;Beibei Ma;Yongwen Tan;Zhenjun Wu;N. Zhang;Xiuqiang Xie
具有所需析氢反应活性位点的二硫化钼基电催化剂的合理设计和合成一直在积极追求。在此，我们展示了一种微波辅助蒸汽加热方法，用于快速有效地合成具有有利暴露活性边缘位点的片状MoS 2基材料。基于这一新策略，我们进一步分别介绍了还原氧化石墨烯（rGO）和碳纳米管（CNT），两个典型的碳同素异形体广泛用于提高二硫化钼的电催化活性，比较评估的支持相互作用和它们对二硫化钼的电催化活性的影响。发现与rGO相比，CNT提供有利的支撑相互作用，这不仅有利于抑制MoS2的定向面内生长以最大化暴露的边缘位点，而且还确保其固有活性的连续性，从而协同促进MoS2对HER的潜力的发挥。我们的工作从概念上强调了支持相互作用对于驯服活性边缘位点的重要性的MoS2，并有望启发合理设计的层状金属二硫属化物为基础的电催化剂，具有良好的活性边缘HER。
The rational design and synthesis of MoS2-based electrocatalysts with desirable active sites for the hydrogen evolution reaction have been actively pursued. Herein, we demonstrate a microwave-assisted steam heating method for the rapid and efficient synthesis of lamellar MoS2-based materials with favorable exposed active edge sites. Based on this new strategy, we have further separately introduced reduced graphene oxide (rGO) and carbon nanotubes (CNTs), two typical carbon allotropes widely used to boost the electrocatalytic activity of MoS2, to comparatively assess the support interactions and their effects on the electrocatalytic activity of MoS2. It was found that as compared to rGO, the CNTs afford favorable support interactions, which not only benefit to suppress the oriented in-plane growth of MoS2 to maximize the exposed edge sites but also ensure the maintainence of their intrinsic activity, thereby synergistically facilitating the exertion of the potential of MoS2 for HER. Our work conceptually highlights the importance of the support interactions for taming the active edge sites of MoS2 and is expected to inspire the rational design of layered metal dichalcogenide-based electrocatalysts with favorable active edges for HER.