A model for the ac-impedance of an electrode coated by a precipitated salt film

✍ Scribed by F.K. Crundwell

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 539 KB
• Volume: 36
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(91)85107-i

✦ Synopsis

The ac-Impedance of an electrode wluch IS coated by a prec~pltated salt lilm 1s described An important aspect of tlus model 1s that It descnbcs the modulation of the film tluckness which &splays an impedance spectrum typical of that of an RC-senes clrcmt (I e a verttcal stra&t lme on the Nyqmst diagram) at frequencies below 1 Hz, m addition to the spectrum for Qffmon through a layer of !ixed tluckness (1 e a loop on the Nyquwt diagram that IS similar m shape to that of convectwe di!Tutuon) A model for the dissolution of Cu m HCl solutions m the hrmtmg-current won that descr~bea the modulation of the tluckness of the prenprtated CuCl f?lm 1s derived and IS shown to be a good descnphon of the expenmental results