Organic‐inorganic CdS/CBT S‐scheme heterojunction with enhanced charge transfer for efficient photocatalytic hydrogen production
Wang Wang, Yaqi Li, Jun Zhu, Cheng Bei, Song Zhang, Guoqiang Luo, Jingsan Xu, Jiaguo Yu, Shaowen Cao
Abstract
Abstract Owing to its ability to reduce charge recombination and enhance redox capability, the step‐scheme (S‐scheme) heterojunction has manifested appealing prospect for photocatalysis. In this work, an organic‐inorganic S‐scheme heterojunction based on CdS nanorods and conjugated polymer 2‐hexyl‐carbazole‐benzothiadiazole (CBT) is constructed. The obtained catalyst exhibited impressive photocatalytic hydrogen production performance (14.02 mmol g −1 h −1 ) with a high apparent quantum efficiency of 5.4% at 420 nm. The charge transfer mechanism and the enhancement of photocatalytic hydrogen production in S‐scheme heterojunctions were investigated by density functional theory calculations, in situ X–ray photoelectron spectroscopy, and in situ Kelvin probe force microscopy. The successful construction of organic‐inorganic S‐scheme heterojunctions and the formation of Cd–S bonds at the interface effectively promoted the separation and transfer of charge carriers.