Water-splitting Performance of TiO_2 Nanotube Arrays Annealed in NH_3 Ambient
- Authors
- 김세임; 김성진; 양비룡
- Issue Date
- 2011
- Publisher
- 한국세라믹학회
- Keywords
- TiO_2; Nanotube; Nitrogen doping; Photocatalysis
- Citation
- 한국세라믹학회지, v.48, no.2, pp 200 - 204
- Pages
- 5
- Journal Title
- 한국세라믹학회지
- Volume
- 48
- Number
- 2
- Start Page
- 200
- End Page
- 204
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/23082
- ISSN
- 1229-7801
2234-0491
- Abstract
- Increase of surface area and decrease of band gap in TiO_2 semiconductors are significant to improve the efficiency of water splitting by photoelectrolysis. In this study TiO_2 nanotube arrays with ~7 um length and ~100 nm diameter were fabricated by an anodizing technique of titanium foils using DMSO (dimethyl sulfoxide)-based electrolytes. Then to control the band gap of the TiO_2 arrays, they were annealed at 550℃ for up to 180 min in NH_3 gas ambient. The samples annealed in NH_3 gas for 30 min and 60 min showed superior photo-conversion efficiency for water splitting under white and visible light. A TiO_2 nanotube annealed in NH_3 gas ambient for a period longer than 120 min showed 1 order higher leakage current. It is believed that the decrease of band gap and increase of conductivity in TiO_2 nanotube arrays due to NH_3 gas treatments result in the superior water-splitting performance.
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