Key Laboratory of Material Chemistry for Energy Conversion and Storage and Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , Wuhan, 430074, P. R. China.
ACS Appl Mater Interfaces. 2017 Feb 15;9(6):5288-5294. doi: 10.1021/acsami.6b15244. Epub 2017 Jan 31.
Effective electrocatalysts for the hydrogen evolution reaction (HER) in alkaline electrolytes can be developed via a simple solvothermal process. In this work, first, the prepared CoMoS nanomaterials through solvothermal treatment have a porous, defect-rich, and vertically aligned nanostructure, which is beneficial for the HER in an alkaline medium. Second, electron transfer from cobalt to MoS that reduces the unoccupied d orbitals of molybdenum can also enhance the HER kinetics in an alkaline medium. This has been demonstrated via a comparison of the catalytic performances of CoMoS, CoS, and MoS. Third, the solvothermal treatment time evidently impacts the electrocatalytic activity. As a result, after 24 h of solvothermal treatment, the prepared CoMoS nanomaterials exhibit the lowest onset potential (42 mV) and overpotential (98 mV) for delivering a current density of 10 mA cm in a 1 M KOH solution. Thus, this study provides a simple method to prepare efficient electrocatalysts for the HER in an alkaline medium.
通过简单的溶剂热法可以开发出用于碱性电解质中析氢反应（HER）的有效电催化剂。在这项工作中，首先，通过溶剂热处理制备的 CoMoS 纳米材料具有多孔、富含缺陷和垂直排列的纳米结构，有利于碱性介质中的 HER。其次，钴到 MoS 的电子转移减少了钼的未占据 d 轨道，也可以增强碱性介质中的 HER 动力学。通过 CoMoS、CoS 和 MoS 的催化性能比较可以证明这一点。第三，溶剂热处理时间对电催化活性有明显的影响。结果，经过 24 小时的溶剂热处理后，所制备的 CoMoS 纳米材料在 1 M KOH 溶液中表现出最低的起始电位（42 mV）和过电位（98 mV），以达到 10 mA cm 的电流密度。因此，本研究为在碱性介质中制备高效电催化剂提供了一种简单的方法。
