An in situ SFG and SERS investigation into the electrodeposition of Au from and solutions

A SERS Investigation of Cyanide Adsorption and Reactivity during the Electrodeposition of Gold, Silver, and Copper from Aqueous Cyanocomplexes Solutions

“…Cases (i) and (iii) match well with our previous results of 26,31 . No statistically significant isotopic effect on the Stark-tuning could be detected, notwithstanding the fact that it could be expected from theoretical considerations.…”

“…In Figure 2 we report SERS spectra collected during electrodeposition from the following Au- its physical interpretation is beyond the scope of the present paper and has been in part addressed in 26 , for the case of the Au(I) and Au(III) systems. This band-like background can be due either to a continuum of SERS bands 27 or to adsorbate-induced fluorescence.…”

Investigation of Au electrodeposition from [BMP][TFSA] room-temperature ionic liquid containing K[Au(CN)2] by in situ two-dimensional sum frequency generation spectroscopy

“…The electrode was brought in contact with the bath at À0.80 V and the potential was subsequently stepped cathodically, electrodepositing for 5 or 30 min before the acquisition of each spectrum. A single potential-dependent resonance m(CN À ads ) was found, that -according to the literature [15] -can be associated either to CN À released by decomposition of the cyanocomplex ([Au(CN) 2 ] À -through chemical adsorptive decomposition at low cathodic overvoltage or via direct reduction at high negative polarisation -or to AuCN ads . The estimates of the parameters of Eq.…”

“…In the presence of K[Au(CN) 2 ], we observed a current density increase from À1.9 V, that can be straightforwardly attributed to Au electrodeposition (e.g. [15]), followed by a typical mass-transport controlled voltammetric peak at À2.5 V, before a further current-density increase, due to the cathodic reactivity of the ionic liquid. The new anodic features that appear after addition of K[Au(CN) 2 ] can be related to CN À adsorption, oxidative adsorption and/or formation of Au(I) complexes with RTIL ions: an insightful investigation of these aspects is beyond the scope of this paper, concentrating on electrodeposition.…”

Sum-frequency generation as a vibrational and electronic probe of the electrochemical interface and thin films

“…Since the success of SFG spectroscopy as a vibrational probe for such systems [1], numerous works have been performed, among which we may mention the characterization of the CN/metal interface in aqueous solutions [2], the hydrogen deposition on Pt [3], the catalytic reduction process of ethanol and methanol at the Pt surface electrode with CO poisoning [4,5] in relation to the development of alcohol-based fuel cells, the effect of organic additives on electroplating on gold [6] and alloys [7].…”