期刊
NANO LETTERS
卷 16, 期 2, 页码 1323-1327出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04724
关键词
Photocatalysis; TiO2 nanoparticles; water splitting; charge dynamics; water adsorption
类别
资金
- Japanese Society for the Promotion of Sciences [25248006, 26810006]
- Grants-in-Aid for Scientific Research [26108508, 25248006, 16H00937, 26810006, 26706015] Funding Source: KAKEN
Charge carrier trapping plays a vital role in heterogeneous photocatalytic water splitting because it strongly affects the dynamics of photogenerated charges and hence the photoconversion efficiency. Although hole trapping by water at water/photocatalyst interface is the first step of oxygen evolution in water splitting, little has been known on how water adsorbate itself is involved in hole trapping dynamics. To clarify this point, we have performed infrared transient and steady-state absorption spectroscopy of anatase TiO2 nanoparticles as a function of the number of water adsorbate layers. Here, we demonstrate that water molecules reversibly adsorbed in the first layer on TiO2 nanoparticles are capable to trap photogenerated holes, while water in the second layer hydrogen bonding to the first-layer water makes hole trapping less effective.
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