In-situ electrochemical-ion-exchange synthesis of S-scheme 1D/2D BiPO4/BiOBr heterojunction film from Bi plate with highly efficient photocatalytic CO2 reduction activity
Qirui Zhang, Xiushuai Guan, Xiaokun Wang, Xiaochao Zhang, Changming Zhang, Jinbo Xue, Caimei Fan
Abstract
The construction of heterojunction structure is an effective strategy for solving photogenerated electron-hole recombination. In this work, a kind of 1D/2D S-scheme BiPO4/BiOBr heterojunction film is designed and constructed by in-situ electrochemical-ion-exchange method on Bi plate. The S-scheme transfer path of photogenerated electrons of BiPO4/BiOBr film is collaboratively confirmed through DFT calculation and in-situ X-ray photoelectron spectra. As-prepared S-scheme BiPO4/BiOBr heterojunction film has the higher CO2 photoreduction activity (296.5 μmol·g−1) to CO, 1.9 times than pure BiOBr film, which should be mainly attributed to improved light utilization efficiency and effective separation/migration of photogenerated electron-hole pairs.