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在SiO2上支的金纳米颗粒上,热电子诱导的H2解离

Shaunak Mukherjee¹, Linan Zhou, Amanda M Goodman

¹Department 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.

Journal of the American Chemical Society

|December 21, 2013

概括

在SiO2上的黄金纳米粒子 (AuNPs) 上,热电子诱导的 (H2) 光解离比在TiO2上要快得多. 这证实了光催化中的热电子机制.

科学领域:

材料科学材料科学材料科学
光催化作用的光催化
表面化学表面化学

背景情况:

黄金纳米颗粒 (AuNPs) 显示出在光催化中有用的等离子体特性.
热电子生成是等离子体驱动反应中的关键机制.
了解支材料效应对于优化光催化效率至关重要.

研究的目的:

为了研究热电子诱导的 (H2) 在小金纳米粒子 (AuNPs) 上的光解离.
为了比较由SiO2支持的AuNPs上的H2解离率与TiO2.2,对比SiO2.
在这个光催化系统中阐明H2解离的机制.

主要方法:

在SiO2和TiO2.2上支持小型AuNP的合成.
在照明下对H2进行光分解实验.
不同的照明强度和波长.
对等离子体吸收的光谱分析.

主要成果:

在AuNPs/SiO2上,H2光解离率几乎比AuNPs/TiO2.2高出两个数量级.
H2解离速率显示对照明强度的线性依赖.
分离的波长依赖性反映了AuNP等离子体吸收光谱.

结论:

支材料 (SiO2与TiO2) 显著影响H2光解离率.
结果强烈支持热电子诱导的H2解离机制.
AuNP的等离子特性对于高效的光催化H2解离至关重要.

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