Revisiting a classical redox process on a gold electrode by operando ToF-SIMS: where does the gold go?

ABSTRACT: Electrochemical redox conversion between ferricyanide and ferrocyanide on a gold electrode is one of the most classical reactions in electrochemistry. In textbooks, the gold electrode is seen as chemically inert, on which only the adsorption/desorption of [Fe(CN)₆]^3/4- and electron transfer take place. Here, the electrochemical process of [Fe(CN)₆]^3/4- on a gold electrode was revisited using a vacuum-compatible microfluidic electrochemical cell in combination with operando liquid ToF-SIMS. An intermediate, Au(CN)₂ ^-, was observed in the cyclic voltammetry of ferricyanide with an interesting periodic potential-dependent variation trend. It was demonstrated that the gold electrode participated in the redox reaction of [Fe(CN)<

SUBMITTER: Hua X 

PROVIDER: S-EPMC6585599 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature