Highly nanotextured beta-Bi2O3 pillars by electrostatic spray deposition as photoanodes for solar water splitting
- Authors
- Kim, Min-Woo; Joshi, Bhavana; Samuel, Edmund; Kim, Karam; Kim, Yong-Il; Kim, Tae-Gun; Swihart, Mark T.; Yoon, Sam S.
- Issue Date
- 5-10월-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Tetragonal Bi2O3; Pillar morphology; Electrostatic spray deposition; Water splitting; Photocurrent; Mott-Schottky analysis
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.764, pp.881 - 889
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 764
- Start Page
- 881
- End Page
- 889
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/72511
- DOI
- 10.1016/j.jallcom.2018.06.047
- ISSN
- 0925-8388
- Abstract
- We demonstrate fabrication of films of highly textured bismuth oxide (Bi2O3) pillars via electrostatic spray deposition and test the performance of these films as photoanodes in photoelectrochemical water splitting. The beta-Bi2O3 and alpha-Bi2O3 phases were identified and distinguished using X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. The beta-Bi2O3 pillars of optimized thickness exhibited a photocurrent density of 0.97 mA.cm(-2) at 0.5 V vs Ag/AgCl. The tetragonal beta-Bi2O3 pillars had enhanced visible light absorbance compared to alpha-Bi2O3 as well as other metal oxides like ZnO and TiO2. Tauc plot analysis of film absorbance showed a decrease in the bandgap of the beta-Bi2O3 phase to 2.5 eV. In Na2SO3 electrolyte, a hole scavenger, the onset voltage for the beta-Bi2O3 phase was shifted to a more negative value (-0.4 V), which increased photocurrent density. The electron concentration reached its highest value of 9.1 x 10(20) cm(-3) for the film with the highest photocurrent density. (C) 2018 Elsevier B.V. All rights reserved.
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