期刊
NANO ENERGY
卷 8, 期 -, 页码 205-213出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.05.017
关键词
Cuprous oxide; Non-layered; Atomically-thin; Visible-light; Photoelectrochemical water splitting
类别
资金
- National Natural Science Foundation of China [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]
- Australian Research Council (ARC) Discovery Project [DE120101788]
Atomically-thin sheet is a new class of two-dimensional materials that bring a wide range of extraordinary properties. However, the lack of intrinsic growth anisotropy makes the synthesis of atomically-thin non-layered materials a great challenge. Here, a versatile rapid-heating strategy is proposed and applied, in which the lamellar hybrid intermediate transforms into the clean and freestanding atomically-thin non-layered Cu2O sheet with 4 atomic thicknesses at 300 degrees C in less than 8 min. Taking advantage of efficient visible-light harvesting, improved carrier density, and fast interfacial charge transfer as well as facile electrochemical reactions, the ultrathin Cu2O sheets-based photoelectrode yields a photocurrent density up to 3.98 mA cm(-2), 36 times higher than that of bulk counterpart. Also, the photoelectrode reaches a visible-light-conversion-efficiency of 26.2% that is superior to most existing reports. The rapid-heating strategy guarantees the full exfoliation of lamellar hybrid intermediate into ultrathin Cu2O sheets with the removal of organic component, opening a new way to produce atomically-thin non-layered materials and holding great promise in the applications of visible-light photoelectrochemical water splitting. (C) 2014 Elsevier Ltd. All rights reserved.
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