Photoinduced Strong Metal–Support Interaction for Enhanced Catalysis

Abstract

Strong metal−support interaction (SMSI) construction is a pivotal strategy to afford thermally robust nanocatalysts in industrial catalysis, but thermally induced reactions (>300 °C) in specific gaseous atmospheres are generally required in traditional procedures. In this work, a photochemistry-driven methodology was demonstrated for SMSI construction under ambient conditions. Encapsulation of Pd nanoparticles with a TiO x overlayer, the presence of Ti 3+ species, and suppression of CO adsorption were achieved upon UV irradiation. The key lies in the generation of separated photoinduced reductive electrons (e − ) and oxidative holes (h + ), which subsequently trigger the formation of Ti 3+ species/oxygen vacancies (O v ) and then interfacial Pd−O v −Ti 3+ sites, affording a Pd/TiO 2 SMSI with enhanced catalytic hydrogenation efficiency. The as-constructed SMSI layer was reversible, and the photodriven procedure could be extended to Pd/ZnO and Pt/TiO 2 .

Type II heterojunction promotes photoinduced effects of TiO2 for enhancing photocatalytic performance

“…This evidence shows that photogenerated electrons successfully reduced Ti 4+ to Ti 3+ under UV irradiation. 15 For the TUN composite (Fig. 2b), the surface Ti species consist of similar components after irradiation (Fig.…”

“…[10][11][12][13] Previous reports have shown that Ti 4+ on the TiO 2 surface captures the photogenerated electrons and generates the active species Ti 3+ under UV irradiation. 14,15 To balance the charge, oxygen vacancies are inevitably produced around the Ti 3+ species. 16,17 Ti 3+ and oxygen vacancies could build a localization state below the TiO 2 conduction band, leading to the bandgap of TiO 2 being narrowed.…”

Strategies to activate inert nitrogen molecules for efficient ammonia electrosynthesis: current status, challenges, and perspectives

“…In general, the supporting substrate can strongly affect the electronic structure of the surface catalytic species. 67,122 According to this, it is logically feasible that the electron-deficient active sites, which are highly desirable for N 2 activation via the s-donation effects, can be constructed via support engineering. In fact, this goal has been realized by adopting semiconductor polymers (e.g., polyimide), carbon-based materials (e.g., boron-carbon-nitrogen materials), and TM oxides (e.g., WO 3 ) as the supporting substrates.…”

Factors Influencing the Performance of Copper-Bearing Catalysts in the CO2 Reduction System

“…230−232 The strong interaction between the active site and the metal oxide support is an important way to improve the activity, selectivity, and stability of the catalyst. 231 At present, there are few studies to improve the catalytic performance of the CO 2 RR by using the SMSI effect. A low-cost core−shell Cu 2 O@SnO x NP catalyst was successfully prepared by Li and co-workers.…”

“…Metal oxides as carriers benefit from the excellent properties of heteroatomic vacancy. , Strong metal–carrier interaction (SMSI) is generally considered to be the interaction between metals and transition metal oxides. − The strong interaction between the active site and the metal oxide support is an important way to improve the activity, selectivity, and stability of the catalyst . At present, there are few studies to improve the catalytic performance of the CO 2 RR by using the SMSI effect.…”