期刊
ADVANCED MATERIALS
卷 30, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704479
关键词
atomic hydrogen; oxygen vacancies; photocatalysts; red TiO2; visible light
类别
资金
- Major Basic Research Program, Ministry of Science and Technology of China [2014CB239401]
- National Science Fund of China [51422210, 21633009, 51629201, 51521091]
- Key Research Program of Frontier Sciences CAS [QYZDB-SSW-JSC039]
- IMR SYNL-T.S
Increasing visible light absorption of classic wide-bandgap photocatalysts like TiO2 has long been pursued in order to promote solar energy conversion. Modulating the composition and/or stoichiometry of these photocatalysts is essential to narrow their bandgap for a strong visible-light absorption band. However, the bands obtained so far normally suffer from a low absorbance and/or narrow range. Herein, in contrast to the common tail-like absorption band in hydrogen-free oxygen-deficient TiO2, an unusual strong absorption band spanning the full spectrum of visible light is achieved in anatase TiO2 by intentionally introducing atomic hydrogen-mediated oxygen vacancies. Combining experimental characterizations with theoretical calculations reveals the excitation of a new subvalence band associated with atomic hydrogen filled oxygen vacancies as the origin of such band, which subsequently leads to active photo-electrochemical water oxidation under visible light. These findings could provide a powerful way of tailoring wide-bandgap semiconductors to fully capture solar light.
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