Multifunctional monoclinic VO2 nanorod thin films for enhanced energy applications: Photoelectrochemical water splitting and supercapacitor
- Authors
- Reddy, I. Neelakanta; Sreedhar, Adem; Shim, Jaesool; Gwag, Jin Seog
- Issue Date
- 15-Feb-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- VO2; Monoclinic; Partial pressure; Reactive sputtering; Photoelectrochemical water splitting; Supercapacitor
- Citation
- JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v.835, pp.40 - 47
- Journal Title
- JOURNAL OF ELECTROANALYTICAL CHEMISTRY
- Volume
- 835
- Start Page
- 40
- End Page
- 47
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1840
- DOI
- 10.1016/j.jelechem.2019.01.026
- ISSN
- 1572-6657
- Abstract
- Monoclinic VO2 nanorod thin films were deposited on indium-tin-oxide-coated glass substrates using radio-frequency reactive magnetron sputtering at a substrate temperature of 300 degrees C and various O-2 flow rates. The thin films were characterized via standard analysis techniques. The VO2 thin films exhibited a highly crystalline monoclinic phase with an indirect band gap of similar to 1.73 eV. At optimized O-2 flow rate (4 sccm), the thin films was observed nanorod structures, exhibited a remarkable photocurrent of -0.08 mA cm(-2) during photoelectrochemical water splitting in the visible region. Electrochemical performance tests of the nanorod films revealed a specific capacitance of similar to 486 mF cm(-2) at a scan rate of 10 mVs(-1). In addition, amperometric I-t curves showed that VO2 thin film electrodes were highly stable during the photo-oxidation process. The nanorod films also exhibited a good specific capacitance of similar to 120 mF cm(-2) after 5000 cycles at a scan rate of 100 mVs(-1). The photocurrents during photoelectrochemical water splitting and the specific capacitance of VO2 thin films deposited at O-2 flow rates of 2 and 6 sccm were 0.06 and 0.07 mA cm(-2) and 398 and 37 mF cm(-2), respectively. The films deposited under Ar at 8 sccm and O-2 at 4 sccm showed the highest photoelectrochemical water splitting performance and specific capacitance, owing mainly to their nanorod-like morphology.
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