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- Title
All-Surface-Atomic-Metal Chalcogenide Sheets for High-Efficiency Visible-Light Photoelectrochemical Water Splitting.
- Authors
Sun, Yongfu; Sun, Zhihu; Gao, Shan; Cheng, Hao; Liu, Qinghua; Lei, Fengcai; Wei, Shiqiang; Xie, Yi
- Abstract
Artificial all-surface-atomic 2D sheets can trigger breakthroughs in tailoring the physical and chemical properties of advanced functional materials. Here, the conceptually new all-surface-atomic semiconductors of SnS and SnSe freestanding sheets are realized using a scalable strategy. As an example, all-surface-atomic SnS sheets undergo surface atomic elongation and structural disordering, which is revealed by X-ray absorption fine structure spectroscopy and first-principles calculations, endowing them with high structural stability and an increased density of states at the valence band edge. These exotic atomic and electronic structures make the all-surface-atomic SnS sheet-based photoelectrode exhibit an incident photon-to-current conversion efficiency of 67.1% at 490 nm, much higher than the efficiencies of other visible-light-driven water splitting. A photocurrent density of 5.27 mA cm-2, which is two orders of magnitude higher than that of the bulk counterpart, is also achieved for the all-surface-atomic SnS sheets-based photoelectrode. This will allow the manipulation of the basic properties of advanced materials on the atomic scale, thus paving the way for innovative applications.
- Subjects
SEMICONDUCTOR analysis; CHALCOGENIDES; ELECTRONIC structure; X-ray absorption; SPECTRUM analysis
- Publication
Advanced Energy Materials, 2014, Vol 4, Issue 1, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201300611