Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 20, Issue -, Pages 153-156Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.03.043
Keywords
Pre-annealed tungsten substrate; PEG directing; Hydrothermal reaction; WO3 nanoflake arrays; Photoelectrochemical water splitting
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Funding
- National Nature Science Foundation of China [21177085]
- State Key Development Program for Basic Research of China [2009CB220004]
- Doctoral Program of the Ministry of Education of China [20110073110029]
- Shanghai Basic Research Key Project [11JC1406200]
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Well-aligned WO3 nanoflake arrays (WNA) as effective photoanode was vertically fabricated on tungsten sheet through a facile hydrothermal process. Before reaction, the tungsten sheet was pre-annealed to produce a thin-layer WO3 on surface to serve as seeded sites for crystal growth in hydrothermal reaction, which also provided a strong connection between the growing WO3 and substrate. Polyethylene glycol (PEG) was used as the structure-directing agent to confine the crystal growth. This preparation route obviously facilitated the charge transfer and reduced the recombination of photoexcited electron/hole. The saturated photocurrent density and IPCE value were found to be 2.35 mA cm(-2) at 1.5 V and 56% which were much higher than that prepared in the absence of pre-annealed WO3 layer and PEG. (C) 2012 Elsevier B.V. All rights reserved.
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