Recent advances in Ni3S2-based electrocatalysts for oxygen evolution reaction

The preparation of hydrogen by electrolysis of water has the characteristics of easily available raw materials, simple process and eco-friendly, which has aroused the interest of many researchers. However, the inherent high reaction energy barrier and four-electron reaction mechanism of oxygen evolution reaction (OER) lead to large reaction overpotential, slow reaction rate and high energy consumption, resulting in low hydrogen evolution efficiency of the cathodic half-reaction, which greatly limits its practical application. Ni3S2 has a heazlewoodite structure. Due to the inherent Ni–Ni metal network, it has near-metal conductivity, which has attracted great attention in the application of electrocatalytic OER. Therefore, this article reviews the application of Ni3S2 and its composites in OER. The composition, structure and electrochemical catalytic performance were systematically summarized. It can be believed that Ni3S2-based materials will have a wide application prospect as OER electrocatalysts in the future.