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Abstract Constructing Mott–Schottky heterojunctions in nanohybrids is an effective strategy for facilitating electron transfer and optimizing the electronic structure of active sites; however, challenges remain. Herein, a selenium‐induced phase separation strategy is proposed and successfully construct NiSe 2 /MoSe 2 Mott–Schottky heterojunctions on N‐doped brain coral carbon nanospheres (N‐BCCSs). Owing to built‐in electric fields, optimized electronic density, and unique nanoflake/sphere structures, the designed NiSe 2 /MoSe 2 @N‐BCCSs carbon‐based Mott–Schottky catalysts achieved satisfactory electrocatalytic performance. When serving as a counter electrode for the triiodide reduction reaction (IRR), a power conversion efficiency of 8.49% is obtained, which outperformed that of conventional Pt electrodes (7.80%). When the NiSe 2 /MoSe 2 @N‐BCCSs are used as electrocatalysts for the hydrogen evolution reaction (HER), their overpotential (η 10 ) is as low as 119 mV, which is significantly better than that of other transition‐metal selenides. This research demonstrates a new concept for constructing Mott–Schottky heterojunctions and provides a new direction for investigating multifunctional carbon‐based composites.
Yun et al. (Sun,) studied this question.