Extraordinarily small Tafel slope for oxide formation reaction on Pt (1 1 1) surface
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- 作者：Kensaku Kodama ; Ryosuke Jinnouchi ; Takahisa Suzuki ; Tatsuya Hatanaka ; Yu Morimoto
- 关键词：Pt (1 ; 1 ; 1) single crystal ; Potential hold ; Oxide formation ; Tafel slope ; Bockris mechanism
- 刊名：Electrochimica Acta
- 出版年：2012
- 出版时间：1 September, 2012
- 年：2012
- 卷：78
- 期：Complete
- 页码：592-596
- 全文大小：545 K
文摘
Oxide formation reaction current density on Pt (1 1 1) was estimated by time-differentiating oxide growth curves during a potential hold as a function of the potential and the coverage with the oxide below 0.35 ML (monolayer). The Tafel slope was 18-24 mV decade?1 in the condition where the Tafel plot is on a straight line. The reaction mechanism accounting for this small slope was proposed, in which the oxide formation process is assumed as a combination of a fast electron transfer step and a following slow step.