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Stationary Potential Patterns during the Reduction of Peroxodisulfate at Ag Ring Electrodes

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Grauel,  Peter
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

Christoph,  Jan
Fritz Haber Institute, Max Planck Society;

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Flätgen,  Georg
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Krischer,  Katharina
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Grauel, P., Christoph, J., Flätgen, G., & Krischer, K. (1998). Stationary Potential Patterns during the Reduction of Peroxodisulfate at Ag Ring Electrodes. The Journal of Physical Chemistry B, 102(50), 10264-10271. doi:10.1021/jp982841m.


Cite as: http://hdl.handle.net/21.11116/0000-0006-D32E-9
Abstract
The potential distribution in front of a Ag ring electrode during the reduction of peroxodisulfate was measured with potential microprobes. Inhomogeneous stationary potential distributions were observed when using a Haber−Luggin capillary, i.e., placing the reference electrode close to the working electrode on the axis of the ring. It is shown that such an arrangement introduces a negative global coupling into the system which destabilizes homogeneous stationary states if the current−potential characteristics exhibits a negative differential resistance. Further consequences of the negative global coupling are discussed, and the effect of an additional, external series resistor is demonstrated.