Electrochemical hydrogen evolution by catalyst membrane composed of platinum, alkyl viologen and Nafion: consideration of the kinetically dominant factor based on understanding of electron-mediating a
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- 作者：Abe ; Toshiyuki ; Fujita ; Takaki ; Sekimoto ; Kouki ; Tajiri ; Akio ; Kaneko ; Masao
- 关键词：Hydrogen evolution ; Alkyl viologen ; Electrocatalysis ; Polymer-coated electrode ; Metal&ndash ; polymer complex
- 刊名：Journal of Molecular Catalysis A: Chemical
- 出版年：2003
- 出版时间：July 1, 2003
- 年：2003
- 卷：201
- 期：1-2
- 页码：55-62
- 全文大小：148 K
文摘
Electrocatalytic H2 formation was carried out by using a Nafion membrane (Nf) embedding a Pt catalyst as well as an alkyl viologen (denoted as RV2+; alkyl group (R): methyl, ethyl, propyl, heptyl, or dodecyl group). The H+ reduction catalyzed by the Pt via the electrogenerated RV
+ was investigated. In order to understand the electron-mediating characteristic of the RV2+ on kinetic aspect, turnover numbers (TON) of the RV2+ for H2 formation as well as electron transport kinetics (represented by the apparent diffusion coefficient of electron, Dapp) of the mediator were studied with respect to RV2+ concentration. In any RV2+ system, both the TON and the Dapp exhibited a similar dependence on the concentration, showing that the overall kinetics is dominated by the electroreduction process of the mediator. When applying both the tetrachloroplatinate(II) (Pt0 in catalytically active state) and the viologen mediator to the H2 formation system, the TON was found to be controlled by the Dapp.
+ was investigated. In order to understand the electron-mediating characteristic of the RV2+ on kinetic aspect, turnover numbers (TON) of the RV2+ for H2 formation as well as electron transport kinetics (represented by the apparent diffusion coefficient of electron, Dapp) of the mediator were studied with respect to RV2+ concentration. In any RV2+ system, both the TON and the Dapp exhibited a similar dependence on the concentration, showing that the overall kinetics is dominated by the electroreduction process of the mediator. When applying both the tetrachloroplatinate(II) (Pt0 in catalytically active state) and the viologen mediator to the H2 formation system, the TON was found to be controlled by the Dapp.