Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes

Denuault, Guy; Mirkin, Michael V.; Bard, A. J.

doi:10.1016/0022-0728(91)85056-u

Cited by 285 publications

(236 citation statements)

References 16 publications

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“…The product of the oxygen diffusion coefficient and the bulk concentration of oxygen in the electrolytes can be calculated from the steady-state diffusion-limited current at a planar microdisk electrode [17]:…”

Section: Resultsmentioning

confidence: 99%

Oxygen reduction at the silver/hydroxide-exchange membrane interface

Sleightholme

Varcoe

Kucernak

2008

Electrochemistry Communications

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Section: Resultsmentioning

confidence: 99%

Oxygen reduction at the silver/hydroxide-exchange membrane interface

Sleightholme

Varcoe

Kucernak

2008

Electrochemistry Communications

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“…To date, critical information (namely n and D) has been absent in the analysis of DMAB oxidation. Bard et al [18,19] demonstrated the application of microelectrodes in elucidating the multistage process of borohydride oxidation. A Au microdisc in base was used to directly determine D for borohydride and subsequently n with a value of 8 for its oxidation to borate inferred [18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of DMAB Oxidation at a Gold Microelectrode in Base

Nagle

Rohan

2005

Electrochemical and Solid-State Letters

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Access to the full text of the published version may require a subscription. determined, the coulomb number for both oxidation waves was shown to be 3. The first wave may be further resolved in dilute solutions revealing three 1-electron steps. RightsThe concentration range wherein the maximum coulombic efficiency for DMAB oxidation on gold may be achieved is demonstrated. An oxidation pathway with a variable coulomb number is suggested.3

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“…The chronoamperometric transient current, i(t), normalized with the steady-state current, i s , is given by the following equation [28] i(t)/is = 1 + (2/n 3,2 )r(DtT m (2) and the diffusion coefficient can be determined from the slope of the linear dependence of /(t)/z' s on f m . Then the concentration of electroactive species can be calculated from the steady-state current according to eq.…”

Section: Introductionmentioning

confidence: 99%

Transport of Ions and Electrostatic Interactions in Thermoresponsive Poly(N-Isopropylacrylamide-co-acrylic acid) Hydrogels: Electroanalytical Studies

Zhang

Ciszkowska

2001

J. Phys. Chem. B

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Poly(N-isopropylacrylacrylamide-co-acrylic acid) hydrogels, NIPA-AA, undergo discontinuous reversible volume phase transitions as a response to temperature increase. Those hydrogels are weakly negatively charged and, therefore, are expected to interact electrostatically with charged species dissolved in those systems. To study transport phenomena and electrostatic interactions in NIPA-AA hydrogels, electroanalytical experiments with two positively charged probes, (ferrocenylmethyl)trimethylammonium, FcTMA+, and hexaammineruthenium(III), Ru(NH3)6 3+, cations were performed, and the results compared with those for an uncharged electroactive probe, 1,1‘-ferrocenedimethanol, Fc(MeOH)2. Steady-state voltammetry and chronoamperometry at platinum disk microelectrodes were used to determine diffusion coefficients of those probes. For temperatures below the volume phase transition of a gel, there are not significant differences in the transport behavior of cationic and uncharged probes. After the volume phase transition occurs and the gel collapses, the diffusion coefficients of all probes decrease, the change in diffusion coefficient is more pronounced for cationic probes than for a neutral probe and depends on the charge of the cationic probe. In addition to changes of transport of cationic species in collapsed NIPA-AA hydrogels, changes in their concentration were detected as a result of the volume phase transition.

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Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes

Cited by 285 publications

References 16 publications

Oxygen reduction at the silver/hydroxide-exchange membrane interface

Oxygen reduction at the silver/hydroxide-exchange membrane interface

Investigation of DMAB Oxidation at a Gold Microelectrode in Base

Transport of Ions and Electrostatic Interactions in Thermoresponsive Poly(N-Isopropylacrylamide-co-acrylic acid) Hydrogels: Electroanalytical Studies

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