Recent advances of nickel hydroxide-based cocatalysts in heterogeneous photocatalysis

Earth-abundant nickel hydroxide (Ni(OH)2)-based cocatalysts, by virtue of its bargain price, simple synthesis and diverse structure, have attracted increasing research interest in the field of solar-to-fuels conversion. Herein, we intend to afford a concise review on the recent progress regarding the promising applications of nickel hydroxide-based cocatalyst for photocatalytic H2 production and CO2 reduction. In particular, the roles of nickel hydroxide-based cocatalysts for promoting photocatalytic activities are systematically discussed. Furthermore, the future prospects and current challenges on constructing high-performance Ni(OH)2-based cocatalysts are proposed, which are expected to stimulate ongoing studies to unlock the potential of Ni(OH)2-based cocatalysts in various photocatalytic application. © 2021 The Authors