The steady-state anodic dissolution of liquid gallium in pure and mixed solutions of sodium hydroxide and potassium chloride at 50Β°C has been studied by a slow galvanostatic technique. With increasing current density, the Tafel slope increases from 215 to 213 of 2.303 RTIF, and the hydroxyl-ion inte
Anodic dissolution of liquid gallium in acid chloride solutions
β Scribed by T. Hurlen
- Publisher
- Elsevier Science
- Year
- 1964
- Tongue
- English
- Weight
- 581 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
Steady-state and transient galvanostatic studies have been made on the anodic dissolution of liquid gallium in pure and mixed solutions of hydrochloric acid and potassium chloride at 50Β°C. The results indicate that fast ion-transfer is followed by rate-determining electron-transfer (redox control), and are consistent with co-operative control by the two one-electron steps of the Ga(l)-Ga(II1) redox reaction. The observed dissolution equivalent of about 2 F/g-atom probably means that association of Ga(1) with Ga(II1) into chloride-stabilized Ga,(IV) succeeds the electrode reactions. The dissolution process is second-order in chloride dependence. Comparisons are made with data in alkaline solutions. R&sum&-Etude galvanostatique en rkgimes stationnaire et transitoire de la dissolution anodique de Ga liq. dans des solutions HCl + KC1 a 50Β°C. 11 apparait qu'un transfert ionique rapide est suivi du transfert d%lectron rkgulateur, d'une man&e compatible avec un contrBle coop&atif par les deux &apes ?t un electron impliqutes par la rkaction redox Ga(I)-Ga(I1). La dissolution observee, Cquivalente ii environ 2 F/at-g signifie probablement qu'une association Ga(I)-Ga(II), dans Ga,(IV) stabilisC par les ions chlore, fait suite aux rkactions d'blectrode. Cette dissolution est du second ordre par rapport & [Cl-]. Comparaison avec des donnQs en milieu alcalin. Zusammenfassnng-Es wurden station&e und instationare galvanische Untersuchungen der anodischen Auflijsung von fliissigem Gallium in reinen und gemischten LGsungen von Salzstiure und Kaliumchlorid bei 50Β°C durchgeflihrt. Die Ergebnisse weisen darauf hin, dass der schnelle Ionen-Transport von einem geschwindigkeits-bestimmenden Elektroneniibergang (Redox-Kontrolle) gefolgt ist, und sie sind in Uebereinstimmung mit der simultanen Kontrolle durch zwei Einelektronen-Ueberglnge der Ga(I)/Ga(III) Redoxreaktion. Das beobachtete Aufltisungs-Aequivalent von ungefiihr 2 F pro g-atom ergibt sich wahrscheinlich daraus, dass die Elektrodenreaktion gefolgt wird von der Assoziation des Ga(1) mit Ga(II1) zum Chlorid-stabilisierten Ga,(IV). Die Abhlngigkeit des AuflSsungsprozesses von der Chlorid-Konzentration ist zweiter Ordnung. Es werden
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