期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 34, 页码 12160-12165出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201601456
关键词
ferroelectric polarization; photocatalysis; selective growth; silver oxide; surface chemistry
资金
- National Natural Science Foundation of China [51232006, 51102212, 51472218, 51102208]
- Fundamental Research Funds for the Central Universities [2014FZA4009]
In this work, single-crystal and single-domain PbTiO3 nanoplates are employed as substrates to prepare Ag2O/PbTiO3 composite materials through a photodeposition method. It is revealed that silver oxide nanocrystals with an average size of 63 nm are selectively deposited on the positive polar surface of the ferroelectric substrate. The possible mechanism leading to the formation of silver oxide is that silver ions are first reduced to silver and then oxidized by oxygen generation. The composite shows an efficient photo-degradation performance towards rhodamine B (RhB) and methyl orange (MO) under visible-light irradiation. Such highly efficient photoactivity can be attributed to the ferroelectric polarization effect of the substrate, which promotes the separation of photogenerated electrons and holes at the interface.
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