Ferricyanide reduction impedance

Figure 15.6 Phase shift of the EHD impedance corresponding to the ferricyanide reduction on a platinum electrode (area 0.38 cm ) coated with a photoresist on which an array of circular sites of diameter dact was patterned, dact = 649 fim, Ci — 96 rpm ( ) and 375 rpm (A). Theoretical curve for a single microelectrode (dashed line), or for the active disk electrode (solid line). (Taken from Deslouis and Tribollet. )...

Table 3.5 Standard deviations reported by Orazem et al. for their impedance data obtained for the reduction of ferricyanide on a Pt rotating disk electrode. The methods of Agarwal et a 56,86 yjgjj tQ fjitgr p jnor lack of replicacy from 26 repeated impedance experiments.

Figure 3.12 Ratio of the variance of the real part of the impedance to the variance of the imaginary part of the impedance for the data for the reduction of ferricyanide on a Pt rotating disk electrode. Dashed lines represent the F-value corresponding to 0.05 significance level and its inverse.

Example 11.1 Diffusion with First-Order Reaction Develop an expression for the impedance response for the reduction of ferricyanide at potentials sufficiently cathodic to allow the anodic reaction to be ignored, yet sufficiently anodic to avoid reduction of oxygen (as a side reaction). Under these conditions, the reaction... 

Figure 18.1 Impedance data as a function of frequency for reduction of ferricyanide on a rotating Pt disk electrode with rotation speed as a parameter a) raw data and b) scaled data. (Taken from Durbha et al. )...

Figure 18.2 Impedance data from Figure 18,1 as a function of scaled frequency p = co/Cl for reduction of ferricyanide on a rotating Pt disk electrode a) the real part of the impedance and b) the imaginary part of the impedance.

Figure 20.3 Comparison in Bode format of the model presented in Figure 20.1 to impedance data obtained for reduction of ferricyanide on a Pt rotating disk electrode a) modulus and b) phase angle.

When envisioning a family of impedance measurements, three measurement time scales become evident. The first time scale is that required for measuring a set of replicated measurements. Such a set of meeisurements is shown in Figure 21.5 for reduction of ferricyanide on a rotating Pt disk electrode. The time required for the set of three measurements was 3581 s (1 h). 

P. K. Shukla, M. E. Orazem, and G. Nelissen, "Impedance Analysis for Reduction of Ferricyanide on a Submerged Hemispherical Ni270 Electrode," Electrochimica Acta, 51 (2006) 1514-1523. 

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