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Herein, in situ generation of CuCoNi nanoalloys over a high-entropy oxide Co 3 MnNiCuZnO x matrix has been employed to generate a sintering-resistant metal-oxide interface for the CO 2 hydrogenation reaction. The high-entropy Co 3 MnNiCuZnO x catalyst with a single reverse spinel structure was synthesized by a mechanochemical redox-based process and thermal treatment just at 600 °C. Interestingly, the entropy-driven force allows the exsolution and dissolution of CuCoNi alloys under reductive and oxidative recyles, which results in the dynamics confinement of the supported metals. With high temperature (500 °C) CO 2 hydrogenation as a model reaction, the restriction of CuCoNi nanoparticles over a high-entropy Co 3 MnNiCuZnO x matrix guaranteed long-term thermal stability (>100 h). In comparison, binary CoMnO x as a control catalyst deactivated in 10 h. This high-entropy stabilization may inspire a number of sintering-resistant catalysts in the near future.

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