Voltammetric studies on anodic oxidation of silver

✍ Scribed by V. Lǎzǎrescu; O. Radovici; M. Vass

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 205 KB
• Volume: 30
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(85)85023-4

✦ Synopsis

Although extensively studied[l-1 11, the anodic oxidation of silver in alkaline solutions is not completely understood. The well-defined oxides, Ag(I) oxide and a higher oxide formulated as Ag(I)Ag(III)O,, are generally recognixed[ 1-I 1 J_ However, as the cyclic voltammetry studies show[4,5,10,12, 131, there are another two anodic processes occurring before the formation of these oxides: a minor one, usually ignored (considered an artifact due to the method of metal fabricationC4, 53 or associated with carbonate impurities[lO]) and a more important one which, for various reasons, was assigned as AgOH[4] or Ag,O[S, 9] formation, Hads desorption[l] or silver dissolution[lO, 111. Recent investigations on the potentiodynarnic behaviour of Ag/aAl,OJ in alkaline solutions[ 141 have shown, however, that the minor peak represents a process which also takes place on a catalyst surface, not only on the mechanically worked surfaces as it had been supposed[4,5]. On the other hand, the invariance of this peak on changes of the carbonate concentrations reported by Droog et aZ.[12] contradicts the earlier suggestions. The anodic oxidation of silver in alkaline solutions