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.
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