Insight into the excellent catalytic activity of (CoMo)S-2/graphene for hydrogen evolution reaction
Insight into the excellent catalytic activity of (CoMo)S-2/graphene for hydrogen evolution reaction
复制标题
深入了解(CoMo)S2/石墨烯对析氢反应的优异催化活性
DOI：
10.1016/j.apcatb.2019.118012
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Q. Jiang
中科院分区：
文献类型：
--
作者：
L. X. Chen;Z. W. Chen;Y. Zhang;C. C. Yang;Q. Jiang
电化学水裂解是一种可持续制氢的潜在途径，高效低成本的催化剂是非常需要的。MoS 2是一种有效但昂贵的铂基催化剂，有望取代铂基催化剂用于析氢反应。计算机模拟结果表明，与Co合金化和与石墨烯复合可以显著提高MoS 2的电催化性能，这是由于MoS 2惰性表面的活化和电子传输的增强。基于这一发现，我们设计并合成了（CoMo）S2/石墨烯催化剂，其表现出优异的性能，具有低起始电位（28 mV）、驱动10 mA cm-2电流密度的过电位（100 mV）和塔菲尔斜率（60.8 mV dec-1），上级公开文献中报道的大多数基于MoS 2的电催化剂。本研究为进一步了解高效非贵金属电催化剂在能量转换装置中的应用提供了重要信息。
Electrochemical water splitting has become a potential pathway for sustainable hydrogen production, where high-efficiency low-cost catalysts are highly desirable. MoS2is a promising candidate to substitute effective but expensive Pt-based catalysts for hydrogen evolution reaction. In this work, the computer simulation results reveal that alloying with Co and compositing with graphene could significantly improve the electrocatalytic performance of MoS2thanks to the activation of MoS2inert surfaces and enhanced electron transport. Based on this finding, we designed and synthesized a catalyst of (CoMo)S2/graphene, which exhibits excellent performance with low onset potential (28 mV), overpotential (100 mV) for driving a current density of 10 mA cm−2, and Tafel slope (60.8 mV dec-1), superior to most of MoS2-based electrocatalysts reported in open literatures. This study supplies important information for fundamental understanding of high-efficiency non-noble electrocatalysts toward applications in energy-conversion devices.