Cobalt–nickel layered double hydroxide on hollow Co<sub>3</sub>S<sub>4</sub>/CuS derived from ZIF-67 for efficient overall water splitting
Ge Li, Ping Wang, Chenyu Li, Fang Zhao, Miao He, Weiwei Wang, Xilin Yuan, Huan Li, Pangen Li, Zhenxing Li
Abstract
Electrochemical water splitting is one of the most efficient strategies to generate clean energy H2. Herein, a novel hollow Co3S4/CuS@CoNi-LDH nanocomposite was designed. This hollow Co3S4/CuS@CoNi-LDH achieved OER overpotential of 220 mV, HER overpotential of 136 mV, respectively, at the current density of 10 mA cm−2. Notably, the hollow Co3S4/CuS@CoNi-LDH serving as both anode and cathode is assembled into a two-electrode water splitting device, and the potential of no more than 1.74 V is required to achieve the overall water splitting efficiency of 10 mA cm−2. This work provides a promising bifunctional catalyst for overall electrochemical water splitting.