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The mechanism of the anodic formation of the peroxodisulphate ion on platinum —IV. influence of alkali-metal cations by W. Smit; J.G. Hoogland is a Engineering article available to read on EtoBox.

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The effect of the alkali-metal cations and of NH&+ ions on the peroxodisulphate formation has heen investigated. On account of the specific adsorption of these cations, the adsorption of SOa\*-ions on the anode is enhanced in the order Na+ < NH&+ < K+ < Cs+. On the parts of the surface where S0,2-ions are adsorbed, the oxygen-evolution reaction is inhibited. Moreover, in the same order, the discharge SOas--SO,-+ e, which is rate-determining, is enhanced, while the rate of the oxygen-evolution reaction on the parts active in this reaction is slowed down. F-ions are adsorbed in the same way as SOrz-ions, and also decrease the surface active in the evolution of oxygen. R6sum&-I?tude de l'effet des cations des m&mx alcalins et des ions NH4+ sur le processus anodique de formation de l'ion peroxodisulfate. l'adsorption des ions SO,%-En consequence de l'adsorption sp&ifique de ces cations, sur l'anode est augmentee dans l'ordre Na+ < NH4+ < K+ < Cs+. Sur les parties de la surface de l'electrode, recouvertes par des ions SO.s-adsorb&, la reaction de d&gagement de l'oxygene est inhibte. En outre, dans le meme ordre, la vitesse du dhhargement S04B--t SO,-+ e, &ant le stade le plus lent, est

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Author

W. Smit; J.G. Hoogland

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

1971

Language

EN

Field

Engineering (Physical Sciences)