Digital simulation of cyclic voltammetry on heterogenous electrodes

✍ Scribed by Guillermo Codina; Gaspar Sanchez; Antonio Aldaz

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 441 KB
• Volume: 36
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(91)85099-s

✦ Synopsis

A method for drgttal slmulahon of lmear-sweep cyclic voltammetry has been developed for redox processes of soluble species on heterogeneous electrodes (electrodes wtth different rate constants for the same electrode process). The heterogenaty may anse from the formatton of an oxtde tllm on the electrode or the depostt of a metal with dtfferent electrocatalyttc acttvtty The method has been apphed to simulate both Cr(II1) reductton on a tm-catalysed graphite electrode m a hydrochlortc acid medmm and the mhtbttton of the oxldatton of a substrate on a polycrystallme gold electrode Key worrls drgttal stmulatron, mhrbthon, voltammetry, Cr(III)/Cr(II), electrocatalysrs, heterogeneous electrodes NOMENCLATURE concentration of species J at distance x at trme t concentration of species J at the electrode surface second order Laplactan operator bulk concentratton of species J dtffuston coeffictent of species J number of electrons Faraday constant electrochermcal standard rate constant transfer coefficient FIRT electrode potential standard electrode potential E -E, stoichtometnc coefficient of species J (v, < 0 and v. > 0)