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Electrosprayed copper hexaoxodivanadate (CuV2O6) and pyrovanadate (Cu2V2O7) photoanodes for efficient solar water splitting

Authors
Kim, Min-wooJoshi, BhavanaYoon, HyunOhm, Tae YoonKim, KaramAl-Deyab, Salem S.Yoon, Sam S.
Issue Date
25-6월-2017
Publisher
ELSEVIER SCIENCE SA
Keywords
Copper vanadate oxide; Water splitting; Photocurrent; Photoanode
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.708, pp.444 - 450
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
708
Start Page
444
End Page
450
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/83093
DOI
10.1016/j.jallcom.2017.02.302
ISSN
0925-8388
Abstract
Copper hexaoxodivanadate (CuV2O6) and copper pyrovanadate (Cu2V2O7) films were fabricated via electrostatic spray deposition for use as photoanodes for solar water splitting. The fabricated films were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, Transmission electron microscopy and X-ray diffraction analysis. The highest photocurrent density observed was 0.65 mA.cm(-2) for a spraying time of 5 min in a mixed aqueous electrolyte consisting of 0.1 M borate and 0.1 M Na2SO3. The high photocurrent density is attributable to an improvement in the electrochemical kinetics at the electrode surface because of the scavenging holes from the electrolyte. The optimal annealing temperature was determined to be 500 degrees C. Further, Cu2V2O7 was confirmed to be more suitable than CuV2O6 with respect to water splitting, as it exhibited a higher photocurrent density. (C) 2017 Elsevier B.V. All rights reserved.
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공과대학 (기계공학부)
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