The pulsed laser-induced Schottky junction via in-situ forming Cd clusters on CdS surfaces toward efficient visible light-driven photocatalytic hydrogen evolution

Abstract

Herein, we developed one simple and novel post-treatment technique via pulsed laser irradiation of CdS (L-CdS) semiconductor to significantly enhance the visible light-driven hydrogen evolution performance from water splitting, during which the rate of hydrogen evolution over L-CdS in the first hour is 40-times than that of pure CdS. Because the pulsed laser irradiation induces the in-situ formation of metallic Cd clusters on CdS surface to construct the Schottky junction between Cd clusters and CdS, obviously facilitating the electron transfer from excited CdS into Cd to endow more photogenerated electrons for enhancing the photocatalytic efficiency of H2 evolution. Moreover, the bandgap narrow of post-treated CdS also benefits the stronger light absorption for enhancing the photocatalytic efficiency. This work may provide a new approach to develop heterojunction-based photocatalysts for efficient solar-to-chemical conversion.