A Zn-doped Ni₃S₂nanosheet array as a high-performance electrochemical water oxidation catalyst in alkaline solution

It is of high importance to design efficient electrocatalysts for the oxygen evolution reaction (OER) at alkaline pH. In this communication, we report the development of a Zn-doped Ni₃S₂ nanosheet array on Ni foam (Zn-Ni₃S₂/NF) as a high-performance and durable electrocatalyst for the OER. Such Zn-Ni₃S₂/NF drives a catalytic current density of 100 mA cm^-2 with the requirement of an OER overpotential of 330 mV, 90 mV less than that for Ni₃S₂/NF. Furthermore, Zn-Ni₃S₂/NF demonstrates excellent long-term electrochemical durability maintaining its activity at an overpotential of 300 mV for 20 h.