Underpotential anodic dissolution of noble metals during the continuous mechanical renewal of their surface

Noninski, Vesselin

doi:10.1016/0022-0728(89)80256-6

Cited by 1 publication

(2 citation statements)

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“…Most of them are based on chemical and electrochemical methods, [7] although mechanical methods are also available. [8] Nowicka et al [9] reported the deactivation of gold electrodes by selective knock-out of the active surface atoms using hydroxyl radicals. Surface deactivation has been also achieved by repetitive Prussian blue formation and removal [10] and by gold etching in cyanide solution in the presence of oxygen.…”

Section: Introductionmentioning

confidence: 99%

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Tuning the Anodic and Cathodic Dissolution of Gold by Varying the Surface Roughness

et al. 2021

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This work presents the reactivity and dissolution of an aspolished and electrochemically pre-treated polycrystalline Au electrode, which is used as a model system. The effect of the electrochemical pre-treatment in corrosive 0.37 M HCl solutions on the Au surface roughness and dissolution is investigated by varying the number of pre-treatment steps at 1.16 V against the reversible hydrogen electrode. It is shown that the first 10 s pretreatment of the as-polished Au results in a higher surface roughness and thus higher electrochemically active surface area (ECSA) than that of the as-polished Au. With the subsequent pre-treatments, however, the ECSA is gradually decreasing reaching a steady value. The dissolution rate of the pre-treated Au electrodes upon potential cycling in 0.1 M H 2 SO 4 is determined by in situ inductively coupled plasma mass spec-trometry. A non-linear dependence of Au dissolution amount is found with respect to the number of pre-treatments. The overall total Au dissolution rate follows a similar trend as ECSA/ roughness. However, an important difference in the dissolution behavior is identified with respect to dissolution processes during Au oxidation (anodic dissolution) and Au reduction (cathodic dissolution): the former is more sensitive to the surface roughness. Thus, the ratio between Au anodic and cathodic dissolution amounts decreases substantially with decrease in surface roughness. This finding is explained by the slow and fast dissolution kinetics for anodic and cathodic processes, respectively. Current work further advances our understanding of the complex Au dissolution mechanism.

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Section: Introductionmentioning

confidence: 99%

“…To modify the surface reactivity, different approaches have been suggested. Most of them are based on chemical and electrochemical methods, [7] although mechanical methods are also available [8] . Nowicka et al [9] .…”

Section: Introductionmentioning

confidence: 99%