Abstract
Spectroelectrochemical behaviour of CN− on a Au electrode in a KAu(CN)2 bath at pH 6.3 was studied by in situ confocal Raman spectroscopy. Internal (CN stretch) and external (Au–CN) CN−-related frequencies were investigated under potentiostatic control in a potential interval spanning cathodic and anodic ranges (−1800 to +1200 mV vs Ag/AgCl). Electrochemical behaviour was assessed by cyclic voltammetry. Stark-shifted Au–NC− species are the dominating ones under cathodic polarization. Above the hydrogen evolution potential a Au–H stretch band can also be observed. At open circuit Au–CN− species tend to prevail, while anodic conditions relate to the enhanced formation of Au(CN)2 − and OCN−.
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Bozzini, B., Fanigliulo, A. An in situ spectroelectrochemical Raman investigation of Au electrodeposition and electrodissolution in KAu(CN)2 solution. Journal of Applied Electrochemistry 32, 1043–1048 (2002). https://doi.org/10.1023/A:1020907915397
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DOI: https://doi.org/10.1023/A:1020907915397