标题：Plasmonic Heterostructure TiO2-MCs/WO3−x-NWs with Continuous Photoelectron Injection Boosting Hot Electron for Methane Generation
作者：Lou, Zaizhu ;Zhang, Peng ;Li, Juan ;Yang, Xianguang ;Huang, Baibiao ;Li, Baojun
作者机构：[Lou, Zaizhu ;Li, Juan ;Yang, Xianguang ;Li, Baojun ] Institute of Nanophotonics, Jinan University, Guangzhou; 511443, China;[Huang, Baibiao ] State K 更多
来源：Advanced Functional Materials
摘要：Nonmetallic plasmonic heterostructure TiO2-mesocrystals/WO3−x-nanowires (TiO2-MCs/WO3−x-NWs) are constructed by coupling mesoporous crystal TiO2 and plasmonic WO3−x through a solvothermal procedure. The continuous photoelectron injection from TiO2 stabilizes the free carrier density and leads to strong surface plasmon resonance (SPR) of WO3−x, resulting in strong light absorption in the visible and near-infrared region. Photocatalytic hydrogen generation of TiO2-MCs/WO3−x-NWs is attributed to plasmonic hot electrons excited on WO3−x-NWs under visible light irradiation. However, utilization of injected photoelectrons on WO3−x-NWs has low efficiency for hydrogen generation and a co-catalyst (Pt) is necessary. TiO2-MCs/WO3−x-NWs are used as co-catalyst free plasmonic photocatalysts for CO2 reduction, which exhibit much higher activity (16.3 µmol g−1 h−1) and selectivity (83%) than TiO2-MCs (3.5 µmol g−1 h−1, 42%) and WO3−x-NWs (8.0 µmol g−1 h−1, 64%) for methane generation under UV–vis light irradiation. A photoluminescence study demonstrates the photoelectron injection from TiO2 to WO3−x, and the nonmetallic SPR of WO3−x plays a great role in the highly selective methane generation during CO2 photoreduction.
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