Cobalt-nickel layered double hydroxide on hollow Co3S4/CuS derived from ZIF-67 for efficient overall water splitting

Electrochemical water splitting is one of the most efficient strategies to generate clean energy H-2. 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.

Automated summary

In this study, a novel hollow Co3S4/CuS@CoNi-LDH nanocomposite was designed and applied in electrochemical water splitting. The results demonstrate that this nanocomposite exhibits efficient oxygen evolution reaction and hydrogen evolution reaction. Furthermore, the water splitting device assembled with the nanocomposite as both anode and cathode requires low potential for achieving high efficiency overall water splitting.