Plasmonic Heterostructure TiO2-MCs/WO3-x-NWs with Continuous Photoelectron Injection Boosting Hot Electron for Methane Generation
Plasmonic Heterostructure TiO2-MCs/WO3-x-NWs with Continuous Photoelectron Injection Boosting Hot Electron for Methane Generation
复制标题
连续光电子注入增强热电子产生甲烷的等离子体异质结构 TiO2-MCs/WO3-x-NWs
DOI：
10.1002/adfm.201808696
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发表时间：
2019-03-14
影响因子：
19
通讯作者：
Li, Baojun
中科院分区：
文献类型：
--
作者：
Lou, Zaizhu;Zhang, Peng;Li, Baojun
通过溶剂热法将介孔晶体TiO₂和等离子体激元WO₃₋ₓ耦合，构建了非金属等离子体异质结构TiO₂介晶/WO₃₋ₓ纳米线（TiO₂ - MCs/WO₃₋ₓ - NWs）。TiO₂持续的光电子注入稳定了自由载流子密度，并导致WO₃₋ₓ产生强表面等离子体共振（SPR），从而在可见光和近红外区域产生强吸收。TiO₂ - MCs/WO₃₋ₓ - NWs的光催化产氢归因于在可见光照射下WO₃₋ₓ - NWs上激发的等离子体热电子。然而，WO₃₋ₓ - NWs上注入的光电子用于产氢的效率较低，且需要助催化剂（Pt）。TiO₂ - MCs/WO₃₋ₓ - NWs被用作无催化剂的等离子体光催化剂用于CO₂还原，在紫外 - 可见光照射下，其对甲烷生成表现出比TiO₂ - MCs（3.5 μmol g⁻¹ h⁻¹，42%）和WO₃₋ₓ - NWs（8.0 μmol g⁻¹ h⁻¹，64%）高得多的活性（16.3 μmol g⁻¹ h⁻¹）和选择性（83%）。光致发光研究表明了从TiO₂到WO₃₋ₓ的光电子注入，并且WO₃₋ₓ的非金属SPR在CO₂光还原过程中对高选择性甲烷生成起着重要作用。
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 mu mol g(-1) h(-1)) and selectivity (83%) than TiO2-MCs (3.5 mu mol g(-1) h(-1), 42%) and WO3-x-NWs (8.0 mu mol 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.