Cyclic Voltammetry of Hexachloroiridate(IV): An Alternative to the Electrochemical Study of the Ferricyanide Ion

Petrovic, Steven C.

doi:10.1007/s00897000416a

Cited by 62 publications

(47 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gold disk microelectrodes of different radii (r 0 ¼ 12. , which are in line with previous results in the literature (see [28,29]). We have also determined the formal potential of FeCl 3 from current reversal chronopotentiometric measures at a gold disk electrode of r 0 ¼ 5 Â 10 À2 cm by following the procedure indicated in [30], and obtaining the value E8' ¼ 0.508 AE 0.001 V (vs. Ag/AgCl), KCl 1.0 M, which is in line with results in [31].…”

Section: Methodssupporting

confidence: 90%

“…Thus, once the values of the diffusion coefficients of IrCl 3À 6 and IrCl 2À 6 have been obtained (see experimental section), we have determined the formal potential of the reversible system K 3 IrCl 6 5 mM þ KNO 3 0.25 M from the measurement of the peak potential, according to Equation 2.1 in Table 2, obtaining the value E8' IrCl 3À 6 /IrCl 2À 6 ¼ 0.710 AE 0.002 V (vs. Ag/ AgCl/KCl 1.0 M), which is in good agreement with that reported in the literature [28]. On the other hand, we have used Equations 2.3 -2.4 in Table 2 for the dI/dE vs. E curves to obtain the charge transfer coefficient and the heterogeneous rate constant of the Fe 3þ reduction in HClO 4 media, once the values of the diffusion coefficient of oxidized species and the formal potential of the electroactive couple are known (see experimental section).…”

Section: Resultssupporting

confidence: 70%

See 1 more Smart Citation

Steady State Reciprocal Derivative Chronopotentiometry with Programmed Currents at Microelectrodes

2005

View full text Add to dashboard Cite

Equations corresponding to the application of Reciprocal Derivative Chronopotentiometry with programmed currents to spherical and disk microelectrodes under steady state conditions have been deduced. Traditional stationary dt/dE vs. E curves for a current time function of the form I(t) ¼ I 0 t u , u > 0, and the new dI/dE vs. E curves, which do not depend on the particular characteristics of the applied programmed current I(t) are shown for any degree of reversibility of the electrode process. The evolution from transient to steady state for both derivative techniques has been analyzed. Criteria for characterizing reversible and totally irreversible stationary derivative curves, together with easy methods for determining thermodynamic and kinetic parameters of the charge transfer process from the measure of peak parameters are proposed. The validity of the theoretical predictions has been experimentally tested with hexachloroiridate(IV) reversible oxidation and with iron(III) irreversible reduction in aqueous media.

show abstract

Section: Methodssupporting

confidence: 90%

Section: Resultssupporting

confidence: 70%

Steady State Reciprocal Derivative Chronopotentiometry with Programmed Currents at Microelectrodes

2005

View full text Add to dashboard Cite

show abstract

“…The mean peak separation (DE) calculated across all laboratories (level 3) was measured to be 101 mV. Since a reversible single electron reaction is theoretically 59 mV, and because similar peak separation values have been reported elsewhere [14], our measured mean value is considered reasonable. However, if one looks at the 5 th CV cycle of randomly selected trials from each laboratory (Fig.…”

Section: Gc Electrode Surface Quality Checkmentioning

confidence: 94%

Standardized Characterization of Electrocatalytic Electrodes

et al. 2008

View full text Add to dashboard Cite

This paper investigates the utility of cross -lab comparative analysis of electrocatalytic electrode performance using standardized modular stack cells and test protocols. Using poly(methylene green)-modified glassy carbon electrodes as the model system, we characterized electrode fabrication and performance with respect to the catalytic oxidation of NADH at neutral pH and low overpotential. Three sets of experiments were duplicated across four independent laboratories and the experimental results from each set were analyzed and compared in terms of key electroanalytical parameters. Statistical analyses were performed at three distinct levels: 1) the standard deviation among repetitive cycles within an experiment; 2) the standard deviation among repetitive experiments in the same laboratory, and 3) the standard deviation among experiments performed across all four laboratories. Using predefined criteria of reproducibility for each level, most parameters were found to be statistically reproducible at most levels. When a particular parameter was found to be irreproducible in a given level, commentary is given on how that information can be used diagnose what chemical/physical aspects of the process were uncontrolled or poorly understood and therefore candidates for future research. This exercise, which is presented as a proof -of-principle step towards the concept of standardizing electrocatalytic evaluation, illustrates the importance of executing electrochemical characterization protocols across several labs and using fixed geometry and dimensions, system configuration, and applied electrochemical conditions. Future work is under way to extend these principles to systems with fluid flow.

show abstract

“…On the other end, it was packed with carbon paste to about 2 mm depth from the liquid interface. The surface of carbon paste was smoothed on a weighing paper for the MCPE, and the surface area of 0.12 cm 2 was calculated based on Randle-Sevcik equation [35]. One hundred mg of nanosized Fe 3 O 4 particles were dispersed in 10 mL ethanol under ultrasonication for 30 min.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…Cyclic voltammetry can provide information on changes of electrode surfaces during modification processes. was calculated for the prepared MCPE/MNP electrode, using the Randle Sevcik equation [35]. By comparison of the surface area of the MCPE/MNP (0.26 cm 2 ) with the MCPE (0.12 cm 2 ), it is indicated that the increased faradaic current of the MCPE/MNP may be due to presence of nanometer sized Fe 3 O 4 particles on the electrode surface (compare curves (A) and (B) in Figure 2(a)).…”

Section: Electrochemical Characterization Of the Mcpe/mnpmentioning

confidence: 99%

A Dopamine Sensor Based on Pre-Concentration by Magnetic Nanoparticles

Bagherzadeh¹,

Ansari

Riahi³

et al. 2013

International Journal of Electrochemistry

View full text Add to dashboard Cite

Herein, Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized and characterized. Afterward, a magnetic carbon paste electrode (MCPE) was modified with MNPs via casting and drying MNPs on top of the MCPE (MCPE/MNP). Electrochemical behavior of the MCPE/MNP was studied by cyclic voltammetry in the presence of [Fe(CN) 6 ] 3−/4− as a redox probe, and surface p of MNPs was evaluated as 6.3 ± 0.1. The behavior of MCPE/MNP towards dopamine (DA) and ascorbic acid (AA) has been investigated by electrochemical methods, and the obtained results showed that the MCPE/MNP has adsorption behavior towards only DA. Based on this behavior, the DA molecules were pre-concentrated on top of the MCPE/MNP and followed with stripping in DA free solution. Subsequent to experimental and instrumental optimization, a calibration curve from 5.0 × 10 −6 to 1.0 × 10 −3 M DA with 2 = 0.999, DL = 7.6 × 10 −7 M DA, and RSD = 4.6%, was obtained in the presence of 1.0 × 10 −3 M AA. Performance of the MCPE/MNP was successfully tested in a pharmaceutical sample.

show abstract

Cyclic Voltammetry of Hexachloroiridate(IV): An Alternative to the Electrochemical Study of the Ferricyanide Ion

Cited by 62 publications

References 1 publication

Steady State Reciprocal Derivative Chronopotentiometry with Programmed Currents at Microelectrodes

Steady State Reciprocal Derivative Chronopotentiometry with Programmed Currents at Microelectrodes

Standardized Characterization of Electrocatalytic Electrodes

A Dopamine Sensor Based on Pre-Concentration by Magnetic Nanoparticles

Contact Info

Product

Resources

About