Anodic dissolution and passivation of gold, particularly in presence of chloride

Lovreček, B.; Moslavac, K.; Matić, Dj.

doi:10.1016/0013-4686(81)85082-7

Cited by 26 publications

(13 citation statements)

References 20 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Cyclic voltammetry has been used to establish the current-voltage characteristics of the well-ordered surfaces associated with single-crystal electrodes. 1,2,4,6 Both the oxidation / reduction processes occurring at high anodic potentials and the more subtle changes that occur within the double-layer region have been studied, see for example…”

Section: Introductionmentioning

confidence: 99%

Surface-plasmon voltammetry using a gold grating

Jory¹,

Cann²,

Sambles³

2010

J. Phys. D: Appl. Phys.

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Section: Introductionmentioning

confidence: 99%

Surface-plasmon voltammetry using a gold grating

Jory¹,

Cann²,

Sambles³

2010

J. Phys. D: Appl. Phys.

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“…Au is known to be dissolved to AuCl 4 − ion in Cl − containing aqueous solution . Au can be oxidized to reducible AuCl 4 − in acidic condition, as follows.

true Au + 4 Cl^{-} \to AuCl_{4}^{-} + 3 e^{-}

…”

Section: Resultsmentioning

confidence: 99%

Local Electrodeposition of Metals by Tip Electrode Dissolution Using Scanning Electrochemical Microscopy

Lee

2018

Electroanalysis

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We have electrodeposited palladium and gold micropatternings using scanning electrochemical microscopy (SECM) with the metal precursor ions generated via anodic dissolution of the ultramicroelectrode (UME) tip itself. Concurrently, in‐situ reduction of the metal ions occurred at the substrate electrode, where the deposition parameters were optimized. In particular, this is the first direct Pd patterning using Pd dissolution without any mediators. The catalytic activities of oxygen reduction on the Pd or Au were studied with tip generation‐substrate collection mode of SECM. The possibility of simultaneous co‐deposition of Pd and Au was also demonstrated using a dual Pd and Au UME.

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“…Au possesses a nontoxic nature, the ability to promote selective reactions at low temperatures, stability against metal leaching, and resistance to overoxidation by O 2 . Gold becomes unstable and dissolves in the positive potential region of electrochemical studies, especially in solutions containing Cl ‑ − or CN – , − where the presence of chloride or cyanide ions enhances the mobility of Au atoms on the Au surface. ,, A potential-dependent dissolution behavior proceeding at lower potentials via a step-flow mode and at higher potentials via a layer-by-layer mode has been observed in 0.1 M HClO 4 solution containing Cl – ions. ,, CN – attacks an Au atom and initially forms linear surface cyanide species, which is then converted to higher coordinated gold–cyanide complexes. , Electrochemically reversible dissolution and deposition of gold has been observed in 0.1 M HClO 4 solution containing KCN, for which two intertwined structures of an AuCN adhesion layer are formed on the electrode surface …”

Section: Introductionmentioning

confidence: 97%

Pit-Induced Electrochemical Layer Dissolution and Wave Propagation on an Au(111) Surface in an Acidic Thiourea Solution

Pan

Shan

et al. 2020

J. Phys. Chem. C

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The mesoscopic evolution of the electrochemical dissolution of an Au(111) facet in acidic thiourea solutions was studied using in situ electrochemical atomic force microscopy (EC-AFM). At the open-circuit potential (OCP, 0.39 V vs RHE) of a gold bead electrode in 1.0 mM thiourea +0.1 M HClO4 solution, the Au(111) plane displays pit-induced layer dissolution, which subsequently transforms into a wave-type dissolution at a rate of 0.05 μm/min. The dissolution of the Au(111) is suppressed in the acidic thiourea solutions as the potential on the negative side of the OCP is varied from 0.37 to 0.28 V (vs RHE) but is promoted as the potential on the positive side of the OCP is varied from 0.42 to 0.58 V (vs RHE). As the applied potential becomes more positive than 0.58 V (vs RHE), the dissolution rate of the Au(111) plane becomes too fast, exceeding the scanning capacity of the EC-AFM. The Au-deposition, starting from 0.25 V (vs RHE) to lower potentials, could be observed by situ-EC-AFM. The reason for the formation of a wave-type dissolution of the Au(111) plane was illustrated through the bonding energy between the sulfur atom of thiourea and gold atoms located at different positions in the Au(111) facet. The dependence of the dissolution of the Au(111) plane on the applied potential in acidic thiourea media is clarified in this work, which provides a new understanding of the kinetics and mechanism for the leaching of gold by thiourea at the mesoscopic level.

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Anodic dissolution and passivation of gold, particularly in presence of chloride

Cited by 26 publications

References 20 publications

Surface-plasmon voltammetry using a gold grating

Surface-plasmon voltammetry using a gold grating

Local Electrodeposition of Metals by Tip Electrode Dissolution Using Scanning Electrochemical Microscopy

Pit-Induced Electrochemical Layer Dissolution and Wave Propagation on an Au(111) Surface in an Acidic Thiourea Solution

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