developing non-precious electrocatalysts with high performance is of primary significance in a fascinating and scalable water splitting technology for hydrogen production. A number of nickel (Ni)-based heterogeneous catalysts have been designed and synthesized to lower the overpotentials for large current densities due to low cost and facile synthesis. Herein, recent progress on Ni-based composites functioning on hydro-gen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting is summarized. The synthesis strategies, structure design and performance analysis of Nibased heterostructured catalysts are thoroughly discussed, aiming to promote the development of highly efficient electrocatalysts that may ultimately replace the noble-metal based catalysts and bring water splitting into the practical application.Yuting Li, a Ph.D. student in the Department of Chemical Engineering at Nanjing University of Science and Technology. Her research interests focus on the rational design and synthesis optimization of bifunctional composites and structure control of non-noble-metal heterogeneous nanomaterials for electrocatalyzing water splitting.

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