Reverse Pulse Voltammetry at Spherical and Disc Microelectrodes: Characterization of Homogeneous Chemical Equilibria and Their Impact on the Species Diffusivities

Molina, Á.; Olmos, J.M.; Laborda, Eduardo

doi:10.1016/j.electacta.2015.03.199

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…Other electrochemical techniques have also been considered to determine diffusion coefficients, such as double pulse chronoamperometry and reverse pulse voltammetry [30][31][32][33][34][35]. They show some advantages with respect to the determination from the peak current in SWV, DDPV [36] or cyclic voltammetry (CV) [37,38], although the extraction of the formal potential is more difficult and less accurate given the non-peak shaped signal.…”

Section: Introductionmentioning

confidence: 99%

Effects of Unequal Diffusion Coefficients and Coupled Chemical Equilibria on Square Wave Voltammetry at Disc and Hemispherical Microelectrodes

Olmos

Molina

Laborda

et al. 2015

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Effects of Unequal Diffusion Coefficients and Coupled Chemical Equilibria on Square Wave Voltammetry at Disc and Hemispherical Microelectrodes

Olmos

Molina

Laborda

et al. 2015

Electrochimica Acta

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“…Since any electron transfer reaction in a ME may thus occur from either phase, a successive two‐step two‐electron reaction might be regarded as a kinetically controlled version of the well‐known extended six‐member square scheme which is depicted in Figure 1. Though the theoretical model of such square scheme(s) is well established for reversible electron transfers [10–15] the implementation of Butler–Volmer electrode kinetics is performed rarely [15] . Usually – i. e. for the purpose of electrochemical trace analysis and sensing applications – this somewhat simplified treatment is fairly sufficient, since the settings of the electroanalytical experiment can be tuned in a way such that the electrochemical kinetics can be neglected [8] .…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Framework for the Electrochemical Characterization of Anisotropic Micro‐Emulsions**

2021

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Micro emulsions (MEs) offer an exceptionally broad spectrum of applications covering sensing, electrosynthesis, supercapacitors and redox‐flow batteries. Herein, we develop the theory for a sophisticated electrochemical characterizion of MEs with a spatially and time‐invariant anisotropy in the diffusion domain by means of cyclic voltammerty (CV). By introducing spatially dependent diffusion coefficients into Ficks' first law, we derive a modified diffusion equation to simulate any inherent anisotropy of the ME under investigation. Moreover, by formulating an extended second‐order homogeneous six‐member square scheme for a kinetically controlled two‐step two‐electron reaction we capture the intricate entanglement of chemical and electrochemical equilibria. Our theoretical concept is finally validated by experimental CV data for the ME based two‐step redox reaction of methyl‐viologen which paves the way for a quantitative electrochemical characterization MEs.

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“…Since any electron transfer reaction in a ME may thus occur from either phase, a successive two-step two-electron reaction might be regarded as a kinetically controlled version of the well-known extended six-member square scheme which is depicted in figure 1. Though the theoretical model of such square scheme(s) is well established for reversible electron transfers [10][11][12][13][14][15] the implementation of Butler-Volmer electrode kinetics is performed rarely [15] . Usually -i.e.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Framework for the Electrochemical Characterization of Anisotropic Micro-Emulsions

Tichter¹,

Borah²,

Nann³

2021

Preprint

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Micro emulsions (MEs) offer an exceptionally broad spectrum of applications covering sensing, electrosynthesis, supercapacitors and redox-flow batteries. Herein, we develop the theory for a sophisticated electrochemical characterizion of MEs with a spatially and time-invariant anisotropy in the diffusion domain by means of cyclic voltammerty (CV). By introducing spatially dependent diffusion coefficients into Ficks first law, we derive a modified diffusion equation to simulate any inherent anisotropy of the ME under investigation. Moreover, by formulating an extended second-order homogeneous six-member square scheme for a kinetically controlled two-step two-electron reaction we capture the intricate entanglement of chemical and electrochemical equilibria. Our theoretical concept is finally validated by experimental CV data for the ME based twostep redox reaction of methyl-viologen which paves the way for a quantitative electrochemical characterization MEs.

show abstract

Reverse Pulse Voltammetry at Spherical and Disc Microelectrodes: Characterization of Homogeneous Chemical Equilibria and Their Impact on the Species Diffusivities

Cited by 8 publications

References 35 publications

Effects of Unequal Diffusion Coefficients and Coupled Chemical Equilibria on Square Wave Voltammetry at Disc and Hemispherical Microelectrodes

Effects of Unequal Diffusion Coefficients and Coupled Chemical Equilibria on Square Wave Voltammetry at Disc and Hemispherical Microelectrodes

A Theoretical Framework for the Electrochemical Characterization of Anisotropic Micro‐Emulsions**

A Theoretical Framework for the Electrochemical Characterization of Anisotropic Micro-Emulsions

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