Electrochemical and in situ optical studies of supported iridium oxide films in aqueous solutions

Youjiang Chen*, Philip L. Taylor, Daniel Alberto Scherson

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Certain aspects of the dynamic behavior of electrochemically deposited hydrous Ir oxide (Ir Ox) films supported on Au microelectrodes during charge and discharge have been investigated by a combination of chronocoulometry and simultaneous in situ normalized reflectance spectroscopy techniques in aqueous solutions. Correlations between the reflectance spectra and the optical properties of the films in its various states of oxidation were sought from in situ transmission measurements for Ir Ox films supported on In-doped tin oxide on glass. The current transient response for Ir Ox ∫Au microelectrodes following a potential step, within the voltage region in which the films display pseudocapacitive characteristics, was found to exhibit a well-defined peak, as opposed to a monotonic decay reported by other groups. Some features of this behavior can be attributed to changes in the conductivity of the film as a function of its state of charge, as has been proposed for electronically conducting polymers. Also presented in this work are data collected over the pH range 0.3-13, which confirm the much faster charge-discharge dynamics in basic compared to acidic media. A primitive model based on proton conductivity within the hydrated oxide lattice is presented which accounts grossly for this pH-induced effect.

本文言語English
ジャーナルJournal of the Electrochemical Society
156
1
DOI
出版ステータスPublished - 2009 1月 1
外部発表はい

ASJC Scopus subject areas

  • 電気化学
  • 再生可能エネルギー、持続可能性、環境
  • 電子材料、光学材料、および磁性材料
  • 材料化学
  • 表面、皮膜および薄膜
  • 凝縮系物理学

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