Compositional engineering of solution-processed BiVO4 photoanodes toward highly efficient photoelectrochemical water oxidation

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Title
Compositional engineering of solution-processed BiVO4 photoanodes toward highly efficient photoelectrochemical water oxidation
Author(s)
Segi Byun; Gihun Jung; Song-Yi Moon; Bumsoo Kim; Jeong Young Park; Seokwoo Jeon; Sung-Wook Nam; Byungha Shin
Publication Date
2018-01
Journal
NANO ENERGY, v.43, no., pp.244 - 252
Publisher
ELSEVIER SCIENCE BV
Abstract
While BiVO4 is a promising photoanode for solar-driven photoelectrochemical (PEC) water splitting, fine control of its chemical composition (Bi/V ratio) and modification of its electrical properties via extrinsic doping are necessary to improve its PEC performance. Here, we performed compositional engineering of BVO-varying Bi/V ratio and inclusion of different concentrations of Mo dopants. Through physical and chemical analyses, we found that the materials properties of BiVO4 and its PEC performance were highly sensitive to the chemical composition. Our optimized BiVO4-based photoanode exhibited the highest photocurrent density among the state-of-the-art SnO2/BiVO4 heterojunction photoanodes reported in the literature: 2.62 and 4.20 mA cm(-2) measured at 1.23 V vs. a reversible hydrogen electrode for the oxygen evolution reaction and sulfite oxidation reaction, respectively. A complete picture explaining various PEC performances with different chemical compositions via the band structure of BiVO4 has emerged. This work points to the importance of specific control of the chemical composition in achieving highly efficient BiVO4-based photoanodes, which will guide future research directions in the fabrication of other high performance photoelectrodes © 2017 Elsevier Ltd. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/4772
ISSN
2211-2855
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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