Facet-dependent electronic modulation of metal-support interactions for enhanced low-temperature benzene oxidation on Pt/Co3O4 catalysts

Recent studies have demonstrated the vital role of strong metal-support interactions (SMSI) in optimizing the performance of supported metal catalysts. However, the explicit impact of strategic control over distinct support facets to enable deliberate tuning of nanoparticle electronic structures remains underexplored. This work investigates facet-dependent SMSI effects in Pt/Co3O4 catalysts for low-temperature benzene oxidation. Pt nanoparticles were synthesized on Co3O4 polymorphs exclusively exposing {112}, {111}, or {001} facets, enabling targeted metal-support interplays. A suite of characterization techniques were employed to analyze how the tailored metal-support interfaces influence the electronic properties of the Pt nanoparticles and optimize active metallic Pt0 content. Preferentially orienting the open {112} facet, with its high density of electron-donating Co2+ species, significantly enhances catalytic performance compared to {111}- and {001}-interfaced systems. Critical insights into oxygen activation efficiency and benzene adsorption behaviors provide a rational understanding of the observed activity differences between the catalyst systems. These findings highlight facetoriented catalyst design as a promising approach to optimize supported metal catalysts for sustainable energy and environmental applications.