期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 4, 页码 1415-1422出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b11061
关键词
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资金
- Japanese Society for the Promotion of Sciences [16H02249, 16H06029]
- MEXT [16H00937]
- European Research Council (ERC) under the European Union's HORIZON research and innovation programme [647020]
- Grants-in-Aid for Scientific Research [16H02249, 16H06029, 16H00937, 17H06087] Funding Source: KAKEN
Heterogeneous photocatalysis is vital in solving energy and environmental issues that this society is confronted with. Although photocatalysts are often operated in the presence of water, it has not been yet clarified how the interaction with water itself affects charge dynamics in photocatalysts. Using water-coverage-controlled steady and transient infrared absorption spectroscopy and large-model (similar to 800 atoms) ab initio calculations, we clarify that water enhances hole trapping at the surface of TiO2 nanospheres but not of well-faceted nanoparticles. This water-assisted effect unique to the nanospheres originates from water adsorption as a ligand at a low-coordinated Ti-OH site or through robust hydrogen bonding directly to the terminal OH at the highly curved nanosphere surface. Thus, the interaction with water at the surface of nanospheres can promote photocatalytic reactions of both oxidation and reduction by elongating photogenerated carrier lifetimes. This morphology-dependent water-assisted effect provides a novel and rational basis for designing and engineering nanophotocatalyst morphology to improve photocatalytic performances.
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