Flower-like microspheres Z-scheme Bi2Sn2O7/NiAl-LDH heterojunction for boosting photocatalytic CO2 reduction under visible light

Shiming Zhang; Yiyuan Rong; Jingwen Wei; Zhihong Li; Ting Liang; Zebin Yu; Hongxiang Zhu; Shuangfei Wang; Yanping Hou

doi:10.1016/j.jcis.2022.09.017

Flower-like microspheres Z-scheme Bi₂Sn₂O₇/NiAl-LDH heterojunction for boosting photocatalytic CO₂ reduction under visible light

J Colloid Interface Sci. 2023 Jan;629(Pt A):604-615. doi: 10.1016/j.jcis.2022.09.017. Epub 2022 Sep 6.

Authors

Shiming Zhang¹, Yiyuan Rong², Jingwen Wei¹, Zhihong Li¹, Ting Liang¹, Zebin Yu³, Hongxiang Zhu⁴, Shuangfei Wang⁵, Yanping Hou⁶

Affiliations

¹ School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
² Guangxi Open University, Nanning 530022, China.
³ School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Key Laboratory of Environmental Protection (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, China.
⁴ College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
⁵ College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Guangxi Bossco Environmental Protection Technology Co., Ltd, 12 Kexin Road, Nanning 530007, China.
⁶ School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Key Laboratory of Environmental Protection (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, China. Electronic address: houyp@gxu.edu.cn.

PMID: 36088705
DOI: 10.1016/j.jcis.2022.09.017

Abstract

Fabrication of efficient photocatalysts with great visible light utilization ability, rapid carriers' separation, and suitable redox potential is essential for improving photocatalytic CO₂ reduction. Herein, flower-like microspheres Bi₂Sn₂O₇/NiAl-layered double hydroxide (BSO/LDH) heterojunctions were prepared by hydrothermal process for CO₂ reduction. The Bi₂Sn₂O₇ nanoparticles were dispersed on NiAl-LDH nanosheets, with tight contact interface, which facilitated charges transfer and exposing more catalytic active sites. Results of photochemical deposition of metal/metal oxide demonstrated that interfacial charges transfer of the BSO/LDH followed Z-scheme mechanism, endowing more desired redox potential and more efficient carriers separation. The 30%-BSO/LDH showed the highest CO and CH₄ yields of 37.91 and 1.18 μmol g^-1 h^-1 under visible light irradiation, 3.4 and 2.0 times higher than those from the NiAl-LDH, respectively. The main intermediates during CO₂ reduction were carboxylate (COOH*) and aldehyde group (CHO*), and CO₂ reduction pathways and mechanism were proposed accordingly. This study provided referential strategy for designing efficient heterojunction photocatalysts for CO₂ conversion.

Keywords: CO(2) photoreduction; CO(2) reduction intermediates; Interfacial charge transfer; Z-scheme Bi(2)Sn(2)O(7)/NiAl-LDH heterojunction.