Flower-like microspheres Z-scheme Bi2Sn2O7/NiAl-LDH heterojunction for boosting photocatalytic CO2 reduction under visible light
2023
Zhang, Shiming | Rong, Yiyuan | Wei, Jingwen | Li, Zhihong | Liang, Ting | Yu, Zebin | Zhu, Hongxiang | Wang, Shuangfei | Hou, Yanping
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.
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