MOF-Derived Hierarchical CoSe<sub>2</sub> with Sheetlike Nanoarchitectures as an Efficient Bifunctional Electrocatalyst
Aihua Zhao, Guan‐Cheng Xu, Yang Li, Jiahui Jiang, Can Wang, Xiuli Zhang, Shuai Zhang, Li Zhang
Abstract
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 CoSe2-160 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 CoSe2-160 microcube has a splendid electrocatalytic performance with 10 mA cm–2 at an overpotential of 156 mV and a small Tafel slope of 40 mV dec–1 (in 0.5 M H2SO4) for hydrogen evolution reaction as well as 328 mV and a small Tafel slope of 73 mV dec–1 (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.