標題: Effects of Pressure in Cathodic Deposition of TiO2 and SnO2 with Supercritical CO2 Emulsified Electrolyte
作者: Lin, Wei-Hao
Chen, Chun-Yi
Chang, Tso-Fu Mark
Hsu, Yung-Jung
Sone, Masato
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: cathodic deposition;titanium dioxides;tin dioxides;high pressure;crystallinity
公開日期: 1-Aug-2016
摘要: This study reports the effect of the high pressure on properties, especially the crystallinity, of the TiO2 and SnO2 films cathodically deposited in supercritical CO2 emulsified electrolyte. The as-deposited metal oxides are usually amorphous when cathodic deposition is applied. An additional heat treatment process is needed to have crystalline metal oxides. In this study, the TiO2 and SnO2 thin films cathodically deposited at elevated pressure showed an improvement in the crystallinity with an increase in the pressure using X-ray diffraction analysis. The high-resolution transmission electron microscopy and selected-area electron diffraction confirmed that the TiO2 deposited at 35 MPa had the anatase crystal structure. An enhancement in the charge carrier dynamics at the TiO2 electrode/electrolyte interface with an increase in the pressure was observed from the electrochemical impedance spectroscopy, which is a result of the improved crystallinity. The effect of the pressure on the crystallinity of the SnO2 was more obvious than that on the TiO2. Grain size of the SnO2 films estimated by the Scherrer equation was increased from 3.5 to 14.8 nm when the pressure was increased from 5 to 25 MPa. (C) 2016 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.electacta.2016.04.088
http://hdl.handle.net/11536/133712
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2016.04.088
期刊: ELECTROCHIMICA ACTA
Volume: 208
起始頁: 244
結束頁: 250
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