Preferential photo-carrier exchange in (010) facet of BiVO4 with decorated CdS nanoparticles

Le résumé fourni par la source

Crystal facet plays an important role in charge exchange in the crystal interface due to different surface energy and electronic structures in different crystal facets. It is expected to improve the photo-carrier collection efficiency in photocatalysis by tailoring the crystal facets of photocatalysts. In this work, BiVO4 nanosheets with the preferential (010) facet exposed and decorated with CdS nanoparticles were investigated as a model. Our results show that the preferential (010) facet exposed BiVO4 nanosheets have favorable photocatalytic performance for CO2 reduction compared with random facet distributed polycrystalline BiVO4 in the same situation after combining with CdS nanoparticles. It is attributed to the specific exposure of the (010) facet of BiVO4 facilitating Z-schemed photo-carrier transfer in composites remarkably. An in-depth investigation of the surface photo-carrier migration by photoconductive atomic force microscopy revealed that photo-electrons of BiVO4 tend to accumulate in the (010) facet due to the lower surface potential energy and, therefore, facilitate the transfer to CdS. This work offers a feasible strategy to further improve the activity of composite photocatalysts by controlling the specific facet exposure.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.