Disentangling Local Interfacial Confinement and Remote Spillover Effects in Oxide–Oxide Interactions

• DOI: 10.1021/jacs.3c02483
• Publication Date: 2023-07-26T10:30:09Z
• Authors: Cui Dong; Rentao Mu; Rongtan Li; Jianyang Wang; Tongyuan Song; Zhenping Qu; Qiang Fu; Xinhe Bao
• Keywords: Hydrogen spillover; Metastability; Spillover effect

Supported oxides are widely used in many important catalytic reactions, which the interaction between oxide catalyst and support is critical but still remains elusive. Here, we construct a chemically bonded oxide–oxide interface by chemical deposition of Co3O4 onto ZnO powder (Co3O4/ZnO), complete reduction to Co0 has been strongly impeded. It was revealed that local interfacial confinement effect Co helps maintain metastable CoOx state CO2 hydrogenation reaction, producing 93% CO. In contrast, physically contacted formed mechanically mixing powders (Co3O4–ZnO), significantly promoted, demonstrating quick increase conversion 45% high selectivity toward CH4 (92%) reaction. This ascribed unusual remote spillover dissociated hydrogen species from nanoparticles neighboring nanoparticles. work clearly illustrates equally opposite effects at interfaces. The distinct interactions contribute diverse phenomena systems.