期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 9, 页码 3685-3690出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201914001
关键词
charge utilization; dual defects; oxygen activation; photocatalysis; nanomaterials
资金
- Natural Science Foundation of China [21722702]
- Tianjin Commission of Science and Technology (key technologies RD projects) [18YFZCSF00730, 18YFZCSF00770, 18ZXSZSF00230]
- National Key Basic Research Program of China [2017YFA0403402]
Defects in nanomaterials often lead to properties that are absent in their pristine counterparts. To date, most studies have focused on the effect of single defects, while ignoring the synergy of multiple defects. In this study, a model of photocatalytic O-2 activation was selected to unravel the role of dual defects by decorating bismuth oxide with surface O vacancies and bulk O substitution simultaneously. The introduction of dual defects led to a spatial and electronic synergistic process: i) O substitution induced a local electric field in the bulk of BiO2-x, which promoted bulk separation of electrons and holes immediately after their generation; ii) O vacancies efficiently lowered the conduction band, served as the capture center for electrons, and thus facilitated the adsorption and activation of O-2. This effect was greatly promoted by the coexistence of bulk O substitution, and DFT calculations showed that only O substitution near an O vacancy could have this effect.
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