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タイトルElectrodeposition of manganese and molybdenum mixed oxide thin films and their charge storage properties
作成者ヨミナカヤマ, マサハル
タナカ, アキヒロ
サトウ, ヨシミネ
トノサキ, ツヨシ
オグラ, コウタロウ
作成者別表記中山, 雅晴
作成者所属山口大学大学院理工学研究科(工学)
内容記述(抄録等)Manganese and molybdenum mixed oxides in a thin film form were deposited anodically on a platinum substrate by cycling the electrode potential between 0 and +1.0 V vs Ag/AgCl in aqueous manganese(II) solutions containing molybdate anion (MoO_4^<2->). A possible mechanism for the film formation is as follows. First, electrooxidation of Mn^<2+> ions with H_2O yields Mn oxide and protons. Then, the protons being accumulated near the electrode surface react with MoO_4^<2-> to form polyoxomolybdate through a dehydrated condensation reaction (by protonation and dehydration). The condensed product coprecipitates with the Mn oxide. Cyclic voltammetry of the Mn/Mo oxide film-coated electrode in aqueous 0.5 M Na_2SO_4 solution exhibited a pseudocapacitive behavior with higher capacitance and better rate capability than that of the pure Mn oxide prepared similarly, most likely as a result of an increase in electrical conductivity of the film. Electrochemical quartz crystal microbalance and X-ray photoelectron spectroscopy clearly demonstrated that the observed pseudocapacitive behavior results from reversible extraction/insertion of hydrated protons to balance the charge upon oxidation/reduction of Mn^<3+>/Mn^<4+> in the film.
本文言語eng
資料タイプtext
出版者American Chemical Society
NII資料タイプ学術雑誌論文
査読の有無査読あり
ISSN0743-7463
NCIDAA10461730
掲載誌名Langmuir : the ACS journal of surfaces and colloids
21
13
開始ページ5907
終了ページ5913
発行日2005-06
DOIinfo:doi/10.1021/la050114u
関連情報URL(IsPartOf)http://pubs.acs.org/journals/langd5/index.html
著者版/出版社版その他
リポジトリID2008010089
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2008010089