Dual Z-Scheme BiOCl/g-C<sub>3</sub>N<sub>4</sub>/Ag<sub>2</sub>CrO<sub>4</sub> Heterojunction for Boosting Photocatalytic CO<sub>2</sub> Reduction
Qingshan Wang, Yi‐chao Yuan, Xing Hu, Dawei Jin, Fengkai Zhang, Xiaojing Liu, Jin-fan Deng, Weiguo Pan, Rui‐tang Guo
Abstract
In this work, a ternary BiOCl/g-C 3 N 4 /Ag 2 CrO 4 composite with a dual Z-scheme heterojunction was prepared based on a g-C 3 N 4 photocatalyst and applied in the photocatalytic reduction of CO 2 . The optimal CH 4 and CO yields of the ternary composite catalyst could be achieved on BOC/CN/ACO-1% with 81.21 and 30.20 μmol g –1 for 6 h, respectively, which was considerably enhanced compared to that for pure g-C 3 N 4 . The apparent quantum efficiency was achieved to be 2.68% for the BOC/CN/ACO-1% catalyst in the photoreduction of CO 2 at 420 nm. This performance enhancement resulted from constructing the dual Z-scheme and the improved light response, which had efficient charge migration and an excellent response to sunlight. This study provides a vital reference for developing dual Z-scheme heterojunction catalysts for the photocatalytic reduction of CO 2 .