Key Words:Carbon dioxide;Artificial photosynthesis - Binary alloys - Catalysts - Charge transfer - Heterojunctions - Plasmonic nanoparticles - Plasmonics - Solar energy - TiO2 nanoparticles - Titanium dioxide
Abstract:A new class of three-component photocatalyst system is designed with plasmonic AuCu nanoprisms embedded between a porous single crystalline TiO<inf>2</inf> nanoplate thin film and polyhedral zeolitic imidazolate frameworks (ZIF-8) nanoparticles for enhanced CO<inf>2</inf> photocatalytic reduction. The ZIF-8 plays a role of CO<inf>2</inf> capture to enhance the reactant concentration on the catalyst, while the AuCu nanoprisms function mainly as a mediator to improve the charge density at the interfaces and facilitate the charge transfer to the CO<inf>2</inf> adsorption sites on ZIF-8 for subsequent CO<inf>2</inf> reduction. The reactant CO<inf>2</inf> could be not only readily collected on the newly designed catalyst, but also more efficiently converted to CO and CH<inf>4</inf>. As a result, compared to the reference sample of two-component system of TiO<inf>2</inf> and ZIF-8 with a CO<inf>2</inf> conversion rate of 12.5 μmol h⁻¹ g⁻¹, the new three-component photocatalyst exhibited a nearly 7-fold improvement in CO<inf>2</inf> photocatalytic reduction performance with CO<inf>2</inf> conversion reaching an outstanding value of 86.9 μmol h⁻¹ g⁻¹, highlighting the importance of rational heterojunction design in facilitating reactant adsorption, charge transfer and reaction processes in photocatalysis.<br/> © 2019
Volume:62
Issue:无
Translation or Not:no