Electron-transfer kinetics from cyclic voltammetry. Quantitative description of electrochemical reversibility

Klingler, R. J.; Kochi, J. K.

doi:10.1021/j150612a028

Cited by 264 publications

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“…The absence of a cathodic peak already mentioned and the referred I pa dependence with scan rate, indicates that compounds XH2, XH4, and XH5 undergo an irreversible electron transfer mechanism in the glassy carbon electrode surface. 33 The mechanism of the redox process can also be estimated by the ratio between the cathodic and anodic peak currents (I pa /I pc ) as well as by the peak potential separation (DE p ). [33][34][35] After a detailed observation of figure 1A and 1C we can conclude that the peak current ratio (I pa /I pc ) tends to be closer to the unit for compounds XH3 and XH7 showing a complete electrochemical reversible process, for all studied pH values.…”

mentioning

confidence: 99%

“…33 The mechanism of the redox process can also be estimated by the ratio between the cathodic and anodic peak currents (I pa /I pc ) as well as by the peak potential separation (DE p ). [33][34][35] After a detailed observation of figure 1A and 1C we can conclude that the peak current ratio (I pa /I pc ) tends to be closer to the unit for compounds XH3 and XH7 showing a complete electrochemical reversible process, for all studied pH values. 35 For compounds XH6 and XH8, it was not possible to determine the I pa /I pc ratio along with the scan rate interval probably due to the existence of a poorly defined reduction peak which stands in the same voltage of the lower cathodic peak.…”

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confidence: 99%

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Electrochemical characterization of bioactive hydroxyxanthones by cyclic voltammetry

Santos

Garcia

Silva

et al. 2013

Tetrahedron Letters

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a b s t r a c tThe present study reports the electrochemical behavior of several phenolic and catecholic-substituted 2,3-diarylxanthones on a glassy carbon electrode, challenged by cyclic voltammetry at different pH values (4.0, 7.4, and 11.0). Higher pH values required lower anodic and cathodic peak voltages. The oxidation of catecholic groups occurred at lower peak potentials in a reversible and pH dependent manner. Anodic peak potentials appeared at higher pH values and were attributed to the electrochemically irreversible oxidation of the phenolic groups. The number and position of hydroxyl substituents were the determinants for the electrochemical behavior and found to correlate with the scavenging activity for reactive oxygen (ROS) and nitrogen species (RNS). A xanthone with two catechol units presented the lowest anodic potential voltage (E pa = 0.15 V) and proved to be the most effective ROS and RNS scavenger.

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confidence: 99%

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confidence: 99%

Electrochemical characterization of bioactive hydroxyxanthones by cyclic voltammetry

Santos

Garcia

Silva

et al. 2013

Tetrahedron Letters

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“…Transfer Rate Constant The heterogeneous electron transfer rate constant "k s " was calculated by using the following equation [17].…”

Section: Determination Of Heterogeneous Electronmentioning

confidence: 99%

Synthesis, Spectral and Electrochemical Studies of Complex of Uranium(IV) with Pyridine-3-Carboxylic Acid

Nazir¹,

Naqvi²

2013

AJAC

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The investigation of complexation of uranium with biological active ligands is vital for understanding uranium speciation in biosystems. A number of studies have been undertaken for investigating the complexation of uranium in its (VI) oxidation states but similar investigations pertaining to the interaction of uranium, in lower oxidation states, with biological ligands is scarce. The aim of the work is to bridge this gap and studies have been carried out to determine the coordination pattern of pyridine-3-carboxylic acid with uranium(IV). Semi-micro analysis, spectro-analytical techniques, magnetic susceptibility and cyclic voltammetry have been employed for the characterization of the synthesized complex.

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“…The study of kinetics of a reaction at an electrode surface is of great importance for basic understanding of the heterogeneous electron transfer processes [15][16][17][18][19][39][40][41]. The heterogeneous rate constants "k s " for the electro-oxidation of methanol on fuel cell catalysts may be evaluated by using the following relation between peak current and peak potential of a completely irreversible electrode reaction [19,40]:…”

Section: Evaluation Of Heterogeneous Rate Constantsmentioning

confidence: 99%

“…[10][11][12][13][14]. Cyclic voltammetry is a well-established technique for the study of kinetics and mechanism of electron transfer processes [15][16][17][18]. It has been used by some people for the kinetic study of electro-oxidation of methanol and evaluation of catalytic activities of fuel cell catalysts [13,14,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Catalytic Activity of Pt and Pt-Ru Catalysts for Electro-oxidation of Methanol in Acid Medium by Cyclic Voltammetry

Khan¹,

Ahmed²,

Mirza³

2009

Port. Electrochim. Acta

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The cyclic voltammetric study on the electro-oxidation of methanol on 30 % Pt and 20 % Pt +10 % Ru catalysts supported on Vulcan XC-72 was carried out in 0.5 M H 2 SO 4 . Kinetic parameters such as exchange current density, Tafel slope and heterogeneous rate constants were calculated. The 30 % Pt showed a higher apparent catalytic activity for the electro-oxidation of methanol as compared with 20 % Pt + 10 % Ru catalyst. The presence of Ru did not contribute significantly towards the apparent catalytic activity of a catalyst for the electro-oxidation of methanol but it may be useful to prevent the catalyst from CO poisoning. Thermodynamic parameters, ∆H * , ∆S * , and ∆G 298 * have been evaluated. The values of ∆H * and ∆G 298 * were positive showing that the electrooxidation of methanol is an endothermic and non-spontaneous process.

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Electron-transfer kinetics from cyclic voltammetry. Quantitative description of electrochemical reversibility

Cited by 264 publications

References 0 publications

Electrochemical characterization of bioactive hydroxyxanthones by cyclic voltammetry

Electrochemical characterization of bioactive hydroxyxanthones by cyclic voltammetry

Synthesis, Spectral and Electrochemical Studies of Complex of Uranium(IV) with Pyridine-3-Carboxylic Acid

Evaluation of Catalytic Activity of Pt and Pt-Ru Catalysts for Electro-oxidation of Methanol in Acid Medium by Cyclic Voltammetry

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