The hydrogen energy generated by the electrocatalytic water splitting reaction has been established as a renewable and clean energy carrier with ultra‐high energy density, which can well make up for shortcomings of conventional renewable energy sources, such as geographical limitations, climatic dependence, and energy wastage. Notably, the introduction of electrocatalysts can enhance the efficiency of the water splitting process to generate hydrogen. Particularly, the heterostructure electrocatalysts constructed by coupling multiple components (or phases) have emerged as the most promising option for water splitting due to the well‐known electronic and synergistic effects. The existing reviews on interface engineering for electrocatalyst design mostly focus on the relationship between the heterostructures and specific electrocatalytic reactions. However, a comprehensive overview of the integration of model building, directional synthesis, and electrocatalytic mechanism has been rarely reported. To this end, in this review, the development of heterostructure catalysts is systematically introduced from the perspective of interface classification, interface growth and synthesis, and regulation of electrocatalytic performance based on the interfacial microenvironment (bonding, electronic configuration, lattice strain, etc.), thereby offering useful insights on the design and construction of interfacial models. Besides, combined with the current development and applications of interface engineering strategies, the challenges of future heterostructure catalysts are discussed and relevant solutions are proposed. Overall, this review can serve as a useful theoretical reference for the integration of interfacial model building, directional synthesis, and electrocatalytic mechanism, which can further promote the development of hydrogen production technologies with low energy consumption and high yield.

Hydrogen evolution reaction (HER) via electrocatalysis using cost-efficient bimetallic phosphide as electrocatalyst holds a great promise for environmentally friendly energy technologies.

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In this study, a composite of Mo, Co co-doped NiS bulks grown on an Ni foam (Mo,Co-NiS/NF) was synthesized as a bi-functional electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) using a simple method.

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