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Electrochemical oscillations on the stationary mercury electrode in bromate solutions

✍ Scribed by A. Olexová; Ľ. Treindl


Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
790 KB
Volume
35
Category
Article
ISSN
0013-4686

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✦ Synopsis


Resume-On etudle, par mesures d'lmpedance, la reactlon de degagement d'hydrogene sur le mckel et sur des couches d'oxyde de mckel form&es par oxydatlon anodlque La presence d'oxyde de mckel conduit a une activation de I'electrode Les dlagrammes d'lmpedance sous degagement d'hydrogene sur le mckel et sur le nickel oxyde sont mductlfs dans un certain domame de potentlel quand la surtenslon croit, 11s sont capaatlfs pms mductlfs en basse frequence Ce comportment est en bon accord avec cehn des dlagrammes theonques traces pour un m&camsme de Volmer-Heyrowsky Abstract-The hydrogen evolution reactlon 1s studled by Impedance measurements on mckel and on layers of nickel oxide obtamed by anodlc oxldatlon The presence of mckel oxide leads to an electrode actlvatlon The impedance diagrams on nickel and on oxlded nickel are inductive m a range of potential when the overvoltage increases, they are capacltlve and then mductlve m the low frequency range This behavlour IS m good agreement with that of theorlcal diagrams plotted for a Volmer-Heyrowsky mechanism


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The oxidation mechanism of 2-mercaptopyridine N-oxide (NOS) is studied in aqueous media. Polarographic, classical and differential pulse, and voltammetic studies were made. The effect of pH, reactant concentration and scan rate on the electrochemical parameters is studied. The results indicate that