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Two-point and three-point methods for the investigation of electrode reaction mechanisms

✍ Scribed by S. Barnartt


Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
857 KB
Volume
15
Category
Article
ISSN
0013-4686

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✦ Synopsis


new method is developed for the study of tit-order electrode reactions. It involves current measurements at just two selected potentials, and yields accurate values for the transfer coefficient and the exchange cd. It has application to many monoelectrodes and corroding electrodes. The method is applied in an experimental study of the FeS+/Fe *+ reaction at platinum electrodes. Also, three-point procedures are developed for the investigation of higher-order electrode reactions, both at monoelectrodes and at corroding electrodes. R&um&-On a d&elopp& une m&hode nouvelle pour l'&ude des r&actions d'6lectrode du premier ordre. Elle comporte des mesures de courant a deux potentiels seulement et foumit des valeurs exactes pour le coefficient de transfert et la densit& du courant d'&hange. B de nombreuses mono-&ctrodes et Clsctrodes corrodantes. Cette m&hode s'applique On l'a utilis& dans une Etude exp&imentale de la &action Feat/Fe'+ sur dlectrodes de platine. On a bgalement d&elopp& des m&hod= & trois points pour l'examen de r&actions d'&ctrode d'ordre sup&ieur & un, sur monodlectrodes et Bgalement sur Electrodes corrodantes. Zusammenfassung-Eine neue Methode zur Untersuchung von Elektrodenreaktionen erster Ordnung wurde entwickelt. Sie umf&sst Strommessungen bei nur zwei bestimmten Potentialen und Iiefert exakte Werte fiir den Durchtrittsfaktor und die Austauschstromdichte. Die Methode kann bei zahlreichen Mono-und Korrosionselektroden angewendt werden. Sie wird am Beispiel der Reaktion Fea+/Fe8f an Platin untersucht. Es werden des weitem Dreipunkts-Methoden fii die Untersuchung von Elektrodenreaktionen hiiherer Ordnung an Mono-und Korrosionselektroden entwickelt.

These methods are developed for the study of monoelectrodes (at which only one reaction occurs) as well as for bielectrodes (corroding systems at which two different reactions proceed simultaneously). In the following presentation Part A treats first-order reactions and Part B higher-order reactions. In Part A a two-point method is developed for monoelectrodes, and its application in an experimental study of the ferrous-ferric ion reaction at platinum electrodes is described.


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