Capacitance of electrodes

Differential Capacitance of Electrode-Electrolyte Solution Interface... 

Figure 9 Equivalent circuit accounting for the electrode-polarization effect. Fq(0 is a rapidly increasing voltage step I(i) is a current Zq is the coaxial line impedance Cp is the capacitance of electrode polarization Cq is an empty cell capacitance filled with a dielectric sample of permittivity e and conductivity 1/R Vp(t) and Fg(i) are the voltages at the appropriate parts of the circuit. (From Ref. 72. With permission from Elsevier Science B.V.)...

Normalizing the capacitance of electrode 2 leads to a dimensionless ratio that is a function of droplet center position as shown in Eq. 6 ... 

Figure 4.11. Two lumped-parameter circuit models for studying the effects of ac electrode polarization in microelectrode systems. simulated biological signal source Cj,Q, contact or source capacitances Cp, electrode polarization capacitance = /(co) shunt capacitance of electrode to electrolyte and reference electrode C, cable leakage capacitance and input capacitance to amplifier system ...

Fig. 7. (a) Simple battery circuit diagram where represents the capacitance of the electrical double layer at the electrode—solution interface, W depicts the Warburg impedance for diffusion processes, and R is internal resistance and (b) the corresponding Argand diagram of the behavior of impedance with frequency, for an idealized battery system, where the characteristic behavior of A, ohmic B, activation and C, diffusion or concentration (Warburg... 

FIQURE 3-5.4.1 Effect of electrode diameter and circuit capacitance on MIE of hydrogen in... 

Table A-4-1.3a, based on data in [62], shows how the MIE (mJ) of 28 vol% hydrogen and 8.5 vol% methane in air vary with circuit capacitance (pF) and electrode diameter (mm). Points refers to the use of steel gramophone needles. The table shows that MIE is decreased with decreased capacitance and electrode diameter however, as reflected in Figure 3-5.4.1 corona...

FIGURE 1-13 Double-layer capacitance of a mercury drop electrode in NaF solutions of different concentrations. (Reproduced with permission from reference 5.)... 

Electrochemical analytical techniques are a class of titration methods which in turn can be subdivided into potentiometric titrations using ion-selective electrodes and polarographic methods. Polarographic methods are based on the suppression of the overpotential associated with oxygen or other species in the polarographic cell caused by surfactants or on the effect of surfactants on the capacitance of the electrode. One example of this latter case is the method based on the interference of anionic surfactants with cationic surfactants, or vice versa, on the capacitance of a mercury drop electrode. This interference can be used in the one-phase titration of sulfates without indicator to determine the endpoint... 

Frumkin was the first to give a qualitative consideration of the electrochemical properties of pc electrodes.10,20 70 He noted that the charge fixed value of the potential E and this may change the form of the capacitance curve near the diffuse-layer capacitance minimum. Important results were obtained in a pioneering paper by Valette and Hamelin.67 They compared experimental capacitance curves for a pc-Ag electrode and its three basic faces. They found that the capacitance of a pc-Ag electrode can be obtained by the superposition of the corresponding Cj, E curves for individual faces exposed at the pc surface, i.e. 

A new approach to the double-layer capacitance of rough electrodes has been given by Daikhin et al.m m The concept of a Debye length-dependent roughness factor [i.e., a roughness function R LD) that deter-... 

Data from many experiments64,71,72,74,287-289 indicate that the differential capacitance of an ideally polarizable electrode at ff jin nonideal... 

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