Impedance of constant phase element (CPE)-blocked diffusion in film electrodes

Impedance Behaviour of a Microporous PMMA-Film ‘Coated Constant Phase Element’ based Chemical Sensor

“…When we look into the complex impedance plots for these two probes -it can be observed that the responses resemble the different diffusion phenomenon reported by the researchers [10], [26]. The curves of Figure 8 are similar to the finite length diffusion curves with reflecting boundaries [27], where as in alkaline solution (pH=9.2) -the complex impedance plots ( Figure 10) give adsorbing boundary of semi-infinite length diffusion [10].…”

Study of the lithium insertion–deinsertion mechanism in nanocrystalline γ-Fe2O3 electrodes by means of electrochemical impedance spectroscopy

“…The classical restricted diffusion equation was not anymore appropriate to simulate the experimental impedance diagrams. Bisquert et al [36,37,38] developed a dynamical model taking into account the roughness or porosity of the electrode material by using the impedance of the CPE (Eq. (3)) for the finite blocked diffusion.…”

Doubling Exponent Models for the Analysis of Porous Film Electrodes by Impedance. Relaxation of TiO2 Nanoporous in Aqueous Solution

“…31,36,37 On the other hand, the effect of blocking at the boundary of transport channels can be modeled by suitable boundary conditions in the solution of the differential equations determining the impedance. 38,39 The distinction between the manifestation of volume and boundary processes in the impedance of thin electrodes was recently discussed. 40 It must be noticed at the outset that transport and reaction properties of porous electrodes depend on the structure and chemical constituents of the phases and on the mechanisms involved.…”