期刊
ACS NANO
卷 11, 期 11, 页码 11441-11448出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b06131
关键词
photocatalysis; water splitting; perovskite nanosheets; doping; exfoliating; visible-light photocatalyst
类别
资金
- Young Scientists Fund of the National Natural Science Foundation of China [21401142]
- Shanghai Science and Technology Commission [14DZ2261100]
- Fundamental Research Funds for the Central Universities
Ultrathin nitrogen-doped perovskite nanosheets LaTa2O6.77N0.15- have been fabricated by exfoliating Dion-Jacobson-type layered perovskite RbLaTa2O6.77N0.15. These nanosheets demonstrate superior photocatalytic activities for water splitting into hydrogen and oxygen and remain active with photon wavelengths as far as 600 nm. Their apparent quantum efficiency under visible-light illumination (lambda >= 420 nm) approaches 1.29% and 3.27% for photocatalytic hydrogen and oxygen production, being, almost 4-fold and 8-fold higher than bulk RbLaTa2O6.77N0.15. Their outstanding performance likely stems from their tiny thickness (single perovskite slab) that essentially removes bulk charge diffusion steps and extends the lifetime of photogenerated charges. Theoretical calculations reveal a peculiar 2D charge transportation phenomenon in RbLaTa2O6.77N0.15; thus, exfoliating RbLaTa2O6.77N0.15 into LaTa2O6.77N0.15- nanosheets has limited impact on charge transportation properties but significantly enhances the surface areas which contributes to more reaction sites.
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