Voltammetric studies on anodic oxidation of silver

Lăzărescu, Valentina; Radovici, O.; Vass, M.

doi:10.1016/0013-4686(85)85023-4

Cited by 13 publications

(4 citation statements)

References 23 publications

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“…On the roughened electrodes at pH 2, the very small reduction in the overpotential of the oxygen reduction is most likely due to the absence of the FeTMPyP porphyrin dimer on the surface. Furthermore, there is an absence of adsorbates such as Ag(OH) and Ag(OH) 2 , which exist on the Ag surface in alkali solutions. , Some studies − have indicated that these adsorbates contribute to the catalytic reduction of oxygen. In acidic solutions where these adsorbates are not present, the absence of catalytic activity may also be due to the weak adsorption of FeTMPyP monomer.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, there is an absence of adsorbates such as Ag(OH) and Ag(OH) 2 , which exist on the Ag surface in alkali solutions. 13,14 Some studies [47][48][49] have indicated that these adsorbates contribute to the catalytic reduction of oxygen. In acidic solutions where these adsorbates are not present, the absence of catalytic activity may also be due to the weak adsorption of FeTMPyP monomer.…”

Section: Resultsmentioning

confidence: 99%

“…We attribute this to the presence of the µ-oxobridged dimer on the surface. In addition, since the catalyzed O 2 reduction occurs at a potential near the partial reduction of the dimer, i.e., around -0.3 V, an EC type mechanism that was postulated for the catalysis of the oxygen reduction 23,48,49 can be assumed to occur:…”

Section: Resultsmentioning

confidence: 99%

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Surface-Enhanced Resonance Raman Scattering and Voltammetry Study of the Electrocatalytic Reduction of Oxygen by the μ-Oxo Dimer of Iron(III) Tetra-4-N-methylpyridylporphyrin

et al. 2002

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In this study, surface-enhanced resonance Raman scattering, SERRS, and voltammetric techniques (cyclic voltammetry, rotating disk electrochemistry, and rotating ring disk electrochemistry) are used to elucidate the mechanism of oxygen reduction on a silver electrode with iron(III) tetra-4-N-methylpyridylporphyrin. The results indicate that after the oxidation reduction cycle at pH 10 and pH 4, the iron porphyrin is adsorbed on the silver surface as a high-spin, five-coordinated μ-oxo-bridged dimer. On the forward voltage scan, this dimer undergoes two successive one-electron reductions at about −0.3 and −0.5 V to form a high-spin fully reduced Fe(II) μ-oxo-bridged dimer. SERRS spectra show that the first electron transfer forms a mixed-valence Fe(II)−O−Fe(III) μ-oxo-bridged dimer system. At pH 2, only the high-spin reduced Fe(II) monomer is adsorbed on the surface. At pH 4 and pH 10, a shift in the reduction of the oxygen overpotential by approximately +150 mV is observed and the active catalyst in this process is attributed to the partially reduced μ-oxo dimer. A value of n ≈ 4 was calculated for the number of electrons involved in this catalytic reaction, and rotating ring disk voltammetry showed that only 10% stable hydrogen peroxide species is produced on the dimer-modified surface. These results are used to formulate a mechanism for the catalytic reduction of oxygen.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Surface-Enhanced Resonance Raman Scattering and Voltammetry Study of the Electrocatalytic Reduction of Oxygen by the μ-Oxo Dimer of Iron(III) Tetra-4-N-methylpyridylporphyrin

et al. 2002

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“…Lazarescue tal. [9]b estimmten diea nodischenV orgängev on Silber in alkalischerL çsungi nG egenwart vonC hlorid,G iles undH arrison [ 10]v erglichend ie Ergebnisse zwischene inem Silber(111)einkristall mitpolykristallinemSilber.…”

Section: Introductionunclassified

Untersuchungen zum Silber‐Zink‐Akkumulator

Jakob

Habekost

2017

Chemkon

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Der Silber‐Zink Akku ist ein recht teurer Akkumulator mit zudem geringer Lebensdauer, er besitzt aber eine sehr hohe https://de.wikipedia.org/wiki/Kapazit%C3%A4t_%28galvanische_Zelle%29 bei geringem Volumen und Gewicht. Die Leerlaufspannung einer Zelle beträgt 1,5 Volt. Der Akku spielt wegen seiner Robustheit vor allem bei der Marine und in der Raumfahrt eine große Rolle. Auch aus didaktischen Gründen ist der Silber‐Zink Akku interessant, denn die Änderungen an der Silberelektrode sind gut optisch zu beobachten und messtechnisch mit einfachen Mitteln zu verfolgen. Zudem sind die Elektrodenvorgänge intensiv untersucht worden und gut verstanden und daher eindeutig beschreibbar.

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Electrochemical dissolution of metals of the platinum group by alternating current

Styrkas

Styrkas²

1995

J Appl Electrochem

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Voltammetric studies on anodic oxidation of silver

Cited by 13 publications

References 23 publications

Surface-Enhanced Resonance Raman Scattering and Voltammetry Study of the Electrocatalytic Reduction of Oxygen by the μ-Oxo Dimer of Iron(III) Tetra-4-N-methylpyridylporphyrin

Surface-Enhanced Resonance Raman Scattering and Voltammetry Study of the Electrocatalytic Reduction of Oxygen by the μ-Oxo Dimer of Iron(III) Tetra-4-N-methylpyridylporphyrin

Untersuchungen zum Silber‐Zink‐Akkumulator

Electrochemical dissolution of metals of the platinum group by alternating current

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