An in situ IR-Vis Sum Frequency Generation Spectroscopy study of cyanide adsorption during zinc electrodeposition
Résumé
In this paper, we demonstrate the feasibility of in situ non-linear IR-Vis Sum Frequency Generation (SFG) Spec-troscopy investigations at zinc surfaces in electrochemical ambient. We investigated both zinc electrodeposition onto an extraneous electrode and adsorption on polycrystalline zinc. Electrodeposition studies were carried out onto a polycrystalline gold cathode in contact with a Zn-cyanocomplex solution containing free CN − , while ad-sorption studies were carried out on a polycrystalline zinc electrode in contact with a free-CN − solution. In both experiments, we monitored the spectroscopic features associated with the internal stretching of the adsorbed cyanide (ca. 2100 cm −1) that we exploited as local Au and Zn site probes. Spectroelectrochemical results were complemented by cyclic voltammetric measurements. This proof-of-principle study is encouraging in the view of more concrete applications regarding additive adsorption at zinc electrodes, aiming at a fundamental understanding of the cycling stability of zinc battery anodes.
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