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Self-assembly two-dimensional NiO/CeO2 heterostructure rich in oxygen vacancies as efficient bifunctional electrocatalyst for alkaline hydrogen evolution and oxygen evolution.

Developing high-efficiency bifunctional electrocatalysts toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline surroundings is essential and challenging for generating clean hydrogen massively. Herein, a novel self-assembly two-dimensional (2D) NiO/CeO2 heterostructure (HS) consisted of NiO and CeO2 nanocrystals has been firstly prepared via a facile two-step approach and utilized as an enhanced bifunctional electrocatalyst for HER and OER under alkaline condition. It is concluded that 2D NiO/CeO2 HS rich in oxygen vacancies demonstrates attractive electrocatalytic properties for both HER and OER in 1 M KOH, including low onset overpotential (η1), η10 and Tafel slope, excellent durability as well as large active surface area. Owing to this, the self-assembly 2D NiO/CeO2 HS is believed to be an efficient bifunctional electrocatalyst toward HER and OER.