Recent Advances in 0D Ni/Co-based Hollow Electrocatalysts for Electrochemical Water Splitting

Electrochemical water splitting using renewable energy sources has been recognized as a sustainable way to produce hydrogen energy due to the characteristics of low-carbon and no pollution.However,the slow hydrogen/oxygen evolution reactions(HER/OER)seriously hinder the practical application of large-scale water splitting.In this paper,the 0D Ni/Co-based hollow material is discussed in detail because of adjustable morphology,low mass density and abundant active sites,which provides an effective solution for improving the HER/OER reaction kinetics.The synthesis methods of hollow materials,such as hard template,soft template and self-template are introduced.Afterward,catalysts with different structural designs of hollow structures are reviewed,including hollow single-shelled structure,hollow core-shelled structure,hollow double-shelled structure and hollow multi-shelled structure(HoMS)catalysts.Wherein,the research progress of the 0D Ni/Co-based HoMS electrocatalysts in recent years and their prominent performances in water splitting are highlighted.Finally,the challenges and development prospects of designing Ni/Co-based HoMS catalysts in water splitting in the future are discussed.