In-situ generation of Bi0 NCs and vacancies on Bi-CTS/BiOBr heterostructures accelerate electron transfer for promoting photocatalytic reduction of CO2. Issue 6 (December 2022)

• Record Type: Journal Article
• Authors: Li, Zhihong; Rong, Yiyuan; Liang, Jiaxiang; Li, Zuji; Wei, Jingwen; Li, Jialu; Zhang, Shiming; Liang, Ting; Yu, Zebin; Hou, Yanping
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 6(2022)
• Publication Date: 2022-12
• Subjects: CO2 reduction -- S-scheme heterojunction -- S, O-vacancies -- Carriers' transfer -- Fermi level equilibrium; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108819
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Developing high-efficiency photocatalysts for CO2 conversion remains a challenge. Herein, S-scheme Bi-Cu3 SnS4 /BiOBr heterojunction with S, O defective vacancies was successfully prepared by hydrothermal process and NaBH4 reduction method. Characterization results showed that the Cu3 SnS4 nanoparticles were uniformly dispersed onto the BiOBr nanosheets, with Bi 0 nanoclusters (NCs) serving as a bridge between the BiOBr and Cu3 SnS4 . The S-scheme heterojunction was demonstrated via ultraviolet photoelectron spectrometer (UPS) work function. The surface plasma resonance (SPR) effect of Bi 0 NCs, the internal electric field (IEF) and S, O defects coregulation of Fermi level equilibrium enhanced light utilization and facilitated photogenerated carriers' separation, resulting in superior photocatalytic activity. Under visible light illumination, the Bi-Cu3 SnS4 /BiOBr(30) achieved CO yield of about 50.13 μmol·g −1 ·h −1 within 120 min, which was 3.5 times of pristine Cu3 SnS4 (15.6 μmol·g −1 ·h −1 ). Moreover, it exhibited the highest incident photon-electron conversion efficiency (10.58% at 380 nm). This study could provide a reference for designing efficient S-scheme heterojunctions for photocatalytic reduction of CO2 . Graphical Abstract: ga1 Highlights: The Bi-Cu3 SnS4 /BiOBr heterojunction with S, O vacancies was successfully prepared. SPR effect of Bi and S, O defects improved photocatalytic activity of CO2 to CO. The CO2 reduction mechanism over the Bi-Cu3 SnS4 /BiOBr composite was discussed.