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Edge effects in an electrochemical reaction: HCOOH oxidation on a Pt ribbon

MPS-Authors
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Christoph,  Johannes
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Noh,  Tae-Geun
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Eiswirth,  Markus
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Lee, J., Christoph, J., Noh, T.-G., Eiswirth, M., & Ertl, G. (2007). Edge effects in an electrochemical reaction: HCOOH oxidation on a Pt ribbon. Journal of Chemical Physics, 126(14): 144702. doi:10.1063/1.2717163.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-0128-5
Abstract
The use of a ribbon-shaped Pt electrode gives rise to edge effects of the interfacial potential, as is predicted from the potential theory in the form of the corresponding reaction-migration equation. They are studied in the bistable region of formic acid oxidation. Essentially, the edges tend to be more passive than the bulk of the electrode, which also causes a passivation (activation) transition to originate from the edges (center) of the ribbon. The experimental results are in agreement with simulations of the reaction-migration system.(activation) transition to originate from the edges (center) of the ribbon. The experimental results are in agreement with simulations of the reaction-migration system.