Formation of CeO 2 /NiO composites with intergrowth superstructures for photocatalytic CO 2 reduction

作者：Rihong Zhang, Qiangqiang Qiao, Binghui Yu, Zihao Zhang, Jiaao Wang, Shuai Li, Yujing Liu, Huadong Yuan, Jianming Luo, Yao Wang, Shihui Zou, Peng Shi, Xinyong Tao, Jianwei Nai · 发表于：Nano Research · 年份：2025 · DOI：10.26599/nr.2025.94907657 · 被引用次数：5 · 研究领域：Catalytic Processes in Materials Science、Advanced Photocatalysis Techniques、Copper-based nanomaterials and applications

The global climate crisis and the excessive consumption of fossil fuels have made photocatalytic CO 2 reduction a promising strategy for achieving carbon neutrality. However, the inherent chemical inertness of CO 2 and the rapid recombination of photogenerated charge carriers still limit its efficiency. In this study, a CeO 2 /NiO composite catalyst with an octahedral orthogonal structure was synthesized by oxidation treatment using a nickel-based cyanide-bridged metal frameworks as the precursor. Characterization analyses revealed that the CeO 2 /NiO composite structure significantly enhanced charge carrier separation efficiency through interfacial synergistic effects, while moderate surface lattice defects improved CO 2 adsorption and activation. Under visible light irradiation, the CO generation rate of the CeO 2 /NiO reached 30.1 mmol·g −1 ·h −1 , which was significantly higher than that of the original precursor, and it exhibited remarkable stability (with activity maintained at over 95% after five cycles). Mechanistic studies indicated that the optimized band structure provided sufficient thermodynamic driving force for CO 2 reduction. The interfacial electron transfer channels facilitated the directional migration of photoelectrons, while surface oxygen vacancies optimized the adsorption energy of the critical intermediate (*COOH) through localized charge redistribution.