Effects of Pressure in Cathodic Deposition of TiO2 and SnO2 with Supercritical CO2 Emulsified Electrolyte

Wei Hao Lin, Chun Yi Chen, Tso Fu Mark Chang*, Yung-Jung Hsu, Masato Sone

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)244-250
Number of pages7
JournalElectrochimica Acta
Volume208
DOIs
StatePublished - 1 Aug 2016

Keywords

  • cathodic deposition
  • crystallinity
  • high pressure
  • tin dioxides
  • titanium dioxides

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