Improved CO2 photocatalytic reduction using a novel 3-component heterojunction

A new class of three-component photocatalyst system is designed with plasmonic AuCu nanoprisms embedded between a porous single crystalline TiO nanoplate thin film and polyhedral zeolitic imidazolate frameworks (ZIF-8) nanoparticles for enhanced CO photocatalytic reduction. The ZIF-8 plays a role of CO 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 adsorption sites on ZIF-8 for subsequent CO reduction. The reactant CO could be not only readily collected on the newly designed catalyst, but also more efficiently converted to CO and CH. As a result, compared to the reference sample of two-component system of TiO and ZIF-8 with a CO conversion rate of 12.5 μmol h g, the new three-component photocatalyst exhibited a nearly 7-fold improvement in CO photocatalytic reduction performance with CO conversion reaching an outstanding value of 86.9 μmol h g, highlighting the importance of rational heterojunction design in facilitating reactant adsorption, charge transfer and reaction processes in photocatalysis