Zhao Aihua, Xu Guancheng, Li Yang, Jiang Jiahui, Wang Can, Zhang Xiuli, Zhang Shuai, Zhang Li
Key Laboratory of Energy Materials Chemistry, Ministry of Education; Key Laboratory of Advanced Functional Materials, Autonomous Region; and Institute of Applied Chemistry, College of Chemistry, Xinjiang University, Shengli Road No. 666, Urumqi 830046, China.
School of Chemical Engineering, Xinjiang University, Shengli Road No. 666, Urumqi 830046, China.
Inorg Chem. 2020 Sep 8;59(17):12778-12787. doi: 10.1021/acs.inorgchem.0c01828. Epub 2020 Aug 24.
The exploitation of efficient and stable non-noble-metal bifunctional electrocatalysts is key to the development of hydrogen production technology. Although some progress has been made in the synthesis of transition-metal selenide nanostructures, the preparation of metal-organic framework (MOF)-derived transition-metal selenide electrode materials with more active sites and nanosheet structures remains a significant challenge. Herein, on the basis of the MOFs, the hierarchical CoSe-160 microcube with sheetlike nanoarchitectures was successfully prepared. In addition, the morphology of cobalt selenides was controlled by adjusting the hydrothermal reaction temperature. Electrochemical experiments show that the CoSe-160 microcube has a splendid electrocatalytic performance with 10 mA cm at an overpotential of 156 mV and a small Tafel slope of 40 mV dec (in 0.5 M HSO) for hydrogen evolution reaction as well as 328 mV and a small Tafel slope of 73 mV dec (in 1 M KOH) for oxygen evolution reaction, respectively. This arises from the nanosheet structures, large surface areas, and abundant active sites. This strategy provides a neoteric synthesis route for the MOF-derived transition-metal selenides with a striking electrocatalytic performance.
开发高效稳定的非贵金属双功能电催化剂是制氢技术发展的关键。尽管在过渡金属硒化物纳米结构的合成方面已取得一些进展，但制备具有更多活性位点和纳米片结构的金属有机框架（MOF）衍生的过渡金属硒化物电极材料仍然是一项重大挑战。在此，基于MOF成功制备了具有片状纳米结构的分级CoSe-160微立方体。此外，通过调节水热反应温度来控制硒化钴的形貌。电化学实验表明，CoSe-160微立方体具有出色的电催化性能，在析氢反应中，在156 mV的过电位下电流密度为10 mA cm ，塔菲尔斜率为40 mV dec （在0.5 M HSO 中）；在析氧反应中，过电位为328 mV，塔菲尔斜率为73 mV dec （在1 M KOH中）。这源于纳米片结构、大表面积和丰富的活性位点。该策略为具有显著电催化性能的MOF衍生过渡金属硒化物提供了一种新型合成路线。
