期刊
NANO LETTERS
卷 11, 期 7, 页码 2919-2926出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201388c
关键词
Photovoltaics; photocatalysis; quantum dots; nanorods
类别
资金
- OBOR Material Networks
- Bowling Green State University
The effect of hole localization on photocatalytic activity of Pt-tipped semiconductor nanocrystals is investigated. By tuning the energy balance at the semiconductor-ligand interface, we demonstrate that hydrogen production on Pt sites is efficient only when electron-donating molecules are used for stabilizing semiconductor surfaces. These surfactants play an important role in enabling an efficient and stable reduction of water by heterostructured nanocrystals as they fill vacancies in the valence band of the semiconductor domain, preventing its degradation. In particular, we show that the energy of oxidizing holes can be efficiently transferred to a ligand moiety, leaving the semiconductor domain intact. This allows reusing the inorganic portion of the degraded nanocrystal-ligand system simply by recharging these nanoparticles with fresh ligands.
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