期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 27, 页码 10647-10653出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01659a
关键词
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资金
- National Nature Science Foundation [21331005, 11079004, 90922016, 21201157, 11321503]
- Chinese Academy of Science [XDB01020300]
- Program for New Century Excellent Talents in University [NCET-13-0546]
- Fundamental Research Funds for the Central Universities [WK2310000022]
Solar-driven photoelectrochemical water splitting represents one of the most challenging tasks for solar-energy utilization. In this study, free-floating ultrathin SnO sheets with different thicknesses were successfully synthesized via a convenient liquid exfoliation strategy, with efforts to disclose the thickness-dependent solar water splitting efficiency in p-type semiconductors. The thinner thickness and larger surface area afford a higher fraction of surface atoms to serve as active sites, while the calculated increased density of states near the Fermi level ensures rapid carrier transport/separation efficiency along the two-dimensional conducting paths of the thinner SnO sheets. As expected, the 3 nm thick SnO sheet-based photocathode shows an incident photon-to-current conversion efficiency of up to 20.1% at 300 nm, remarkably higher than 10.7% and 4.2% for the 5.4 nm thick SnO sheet-and bulk SnO-based electrodes. This work discusses the thickness-dependent solar water splitting efficiency in ultrathin p-type semiconductor sheets, thus opening new opportunities in the field of solar cells and photocatalysts.
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