Journal
NANO ENERGY
Volume 23, Issue -, Pages 153-160Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2016.03.021
Keywords
Self-assembled; Nanocomposites; Epitaxial nickel tungstate; Water splitting; Photoelectrochemical; Heteroepitaxy
Categories
Funding
- Academia Sincia Research Program on Nanoscience and Nanotechnology Taiwan
- Ministry of Science and Technology. R.O.C [MOST 103-2119-M-009-003-MY3, 104-2628-E-009-005-MY2]
- Center for Interdisciplinary Science of National Chiao Tung University
- Ministry of Education, R.O.C. [MOE-ATU 104W961]
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Self-assembled nanocomposites with a high interface-to-volume ratio offer tremendous opportunities of tailoring functionalities by a proper combination of components. In this study, we report the first fabrication of self-assembled NiWO4-WO3 heteroepitaxy and its excellent performance on photoel-ectrochemical water splitting. The heteroepitaxy is evidenced by a combination of x-ray diffraction and transmission electron microscopy. The energy band diagram of NiWO4-WO3 heterostructure probed by x-ray photoelectron spectroscopy suggests an efficient charge separation at their interface by injecting photo -generated electrons from NiWO4 to WO3 and holes from WO3 to NiWO4. Therefore, a great improvement in the photoelectrochemical activity of self -assembled NiWO4-WO3 heteroepitaxy was achieved (1400 mu A cm(-2) at 0.7 V vs. Ag/AgCl). This work delivers a new category of composite materials for promising photoelectrode in photoelectrochemical cells. (C) 2016 Elsevier Ltd. All rights reserved.
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