Abstract
AbstractNonmetallic 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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