期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 10, 页码 2285-2292出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201905670
关键词
amorphous red phosphorus; band-gap engineering; charge transfer; oxygen covalent functionalization; photocatalytic H-2 evolution
资金
- National Natural Science Foundation of China [21872102]
- Natural Science Foundation of Tianjin [17JCYBJC22600]
- Fundamental Research Funds for the Central Universities
It is known that the low lifetime of photogenerated carriers is the main drawback of elemental photocatalysts. Therefore, a facile and versatile one-step strategy to simultaneously achieve the oxygen covalent functionalization of amorphous red phosphorus (RP) and in situ modification of CdCO3 is reported. This strategy endows RP with enhanced charge carrier separation ability and photocatalytic activity by coupling band-gap engineering and heterojunction construction. The as-prepared nCdCO(3)/SO-RP (n=0.1, 0.25, 0.5, 1.0) composites exhibited excellent photocatalytic H-2 evolution activity (up to 516.3 mu mol g(-1) h) from visible-light-driven water splitting (lambda>400 nm), which is about 17.6 times higher than that of pristine RP. By experimental and theoretical investigations, the roles of surface oxygen covalent functionalization, that is, prolonging the lifetime of photogenerated carriers and inducing the negative shift of the conduction band potential, were studied in detail. Moreover, the charge transfer mechanism of these composites has also been proposed. In addition, these composites are stable and can be reused at least for three times without significant activity loss. This work may provide a good example of how to promote the activity of elemental photocatalysts by decorating their atomic structure.
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