光热效应增强的Au/RGO/Na2Ti3O7光催化加氢性能

将典型的光热等离激元石墨烯和纳米金简便地负载在钛酸钠(Na₂Ti₃O₇)载体上, 构建出具有较窄禁带宽度和较高光催化活性的Au/RGO/Na₂Ti₃O₇光热辅助光催化体系. 研究发现, 石墨烯片层与金纳米颗粒在光照下, 通过局域表面等离激元共振效应诱导产生大量的热电子, 以活化反应物并降低反应活化能, 其引发的光热效应还可精准提升光催化体系中反应位点附近的温度, 从而大幅提升光催化反应速率. 通过构建特殊微支结构, 进一步增强了Au/RGO/Na₂Ti₃O₇催化剂对光的捕获, 并限域锚定高表面能催化剂以增强体系的稳定性. 在光热、 光催化的高效协同增强下, Au/RGO/Na₂Ti₃O₇催化剂体系对对硝基苯酚和肉桂醛的加氢反应均表现出增强的光催化活性. 光热辅助下的Au/RGO/Na₂Ti₃O₇光催化剂在对硝基苯酚反应中的转换频率（TOF）值高达54.4 min^-1, 反应活化能显著降低至15.78 kJ/mol, 且其在长效测试中表现出良好的稳定性（4次循环催化后, 转化率的保持率近90%）.

Photothermal Enhanced Photocatalytic Hydrogenation Performance of Au/RGO/Na2Ti3O7

Typical photothermal plasmon graphene and nano gold were simply supported on sodium titanate（Na₂Ti₃O₇）. Thus， Au/RGO/Na₂Ti₃O₇ photothermal-assisted photocatalytic system was constructed， featured with narrow bandgap and high photocatalytic activity. Graphene sheets and gold nanoparticles could generate a large number of hot-electron for activating reactants and reducing the reaction energy，through their local surface plasmon resonance effect under light. The photothermal effect can precisely raise the temperature near the reaction site， thus greatly improving the photocatalytic reaction rate. In addition， the Au/RGO/Na₂Ti₃O₇ catalyst is endow with enhanced light-trapping performance by ably constructing special micro-branched structure. Also， the stability of catalyst was enhanced by confinement effects. Under the synergistic enhancement of photothermal effect and photocatalysis， Au/RGO/Na₂Ti₃O₇ catalyst showed enhanced photocatalytic activity for the p-nitrophenol hydrogenation and cin-namaldehyde hydrogenation. The turnover frequency（TOF） of the p-nitrophenol reduction reaction catalyzed by the photothermal-assisted Au/RGO/Na₂Ti₃O₇ was up to 54.4 min^-1， and the activation energy barrier was significantly reduced to 15.78 kJ/mol. Moreover， it showed high stability in the long-term test（after 4 cycling test， the conversion retention rate was nearly 90%）.