Department of Chemistry, †Department of Physics and Astronomy, #Department of Electrical and Computer Engineering, and ‡Laboratory for Nanophotonics, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
J Am Chem Soc. 2014 Jan 8;136(1):64-7. doi: 10.1021/ja411017b. Epub 2013 Dec 26.
Hot-electron-induced photodissociation of H2 was demonstrated on small Au nanoparticles (AuNPs) supported on SiO2. The rate of dissociation of H2 was found to be almost 2 orders of magnitude higher than that observed on equivalently prepared AuNPs on TiO2. The rate of H2 dissociation was found to be linearly dependent on illumination intensity with a wavelength dependence resembling the absorption spectrum of the plasmon of the AuNPs. This result provides strong additional support for the hot-electron-induced mechanism for H2 dissociation in this photocatalytic system.
在负载于二氧化硅上的小金纳米粒子（AuNPs）上，证明了热电子诱导的 H2 光解反应。发现 H2 的离解速率比在 TiO2 上同等制备的 AuNPs 上观察到的速率高近 2 个数量级。H2 的离解速率被发现与光照强度呈线性相关，其波长依赖性类似于 AuNPs 等离子体的吸收光谱。这一结果为该光催化体系中 H2 离解的热电子诱导机制提供了强有力的额外支持。
