Synthesis of Bi2WO6 photoanode on transparent conducting oxide substrate with low onset potential for solar water splitting

Title
Synthesis of Bi2WO6 photoanode on transparent conducting oxide substrate with low onset potential for solar water splitting
Authors
채상윤이은선정혜진황윤정주오심
Keywords
water splitting; photoanode; Bi2WO6; onset potential; p/n photodiode
Issue Date
2014-06
Publisher
RSC advances
Citation
VOL 4, NO 46, 24032-24037
Abstract
To enable water splitting in photoelectrochemical cells, the conduction-band (CB) and valence-band edges must straddle the hydrogen-reduction and water-oxidation potentials; however, the CB edge potential of many photoanodic semiconductors is insufficient. Here, we demonstrate the nanostructured Bi2WO6 for photoanodic application, which has a high, flat-band potential of 0.15 V vs. RHE. Single-phase, orthorhombic Bi2WO6 nano-structures were successfully grown on an FTO substrate through a two-step hydrothermal synthesis with subsequent thermal treatment at 600 °C. The synthesized Bi2WO6 photoanode shows a lower onset potential and improved photocurrents which were enhanced further by a factor of three by coating the surface with Co-Pi. The low onset potential of the Bi2WO6/Co-Pi photoanode results in a higher operating photocurrent in a p/n photodiode cell combined with a p-Si/n-Si/Pt photocathode.
URI
http://pubs.kist.re.kr/handle/201004/47739
ISSN
20462069
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KIST Publication > Article
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