Reflections on the history of electrochemical impedance spectroscopy

The aim of this work is to discuss the photocatalytic performance of the titania-zirconia porous photocatalyst layers synthesized via micro arc oxidation technique. An attempt was also made to put forward the basic formation mechanism of the layers. Impedance and optical properties of the photocatalyst layers were studied by electrochemical impedance spectroscopy (EIS), Photoluminescence spectroscopy and UV-vis absorption spectroscopy, in order to assess their intrinsic catalytic properties.The results of the EIS were correlated with the microstructural characteristics along with measurements of Methylene Blue (MB) photocatalytic degradation. The results show enhanced photocatalytic activity of TiO 2 -ZrO 2 composite layers compared to pure TiO 2 layer. It was revealed that the photocatalytic activity of the layers prepared at different duty cycles is influenced by characteristics of microdischarge regime imposed by working electrolytes with varying additive concentration. The results of photocatalytic degradation of methylene blue were in good agreement with those obtained from electrochemical analysis.

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“…The phase angle of about in the middle frequency region of Bode plots is an evidence for controlled impedance behavior [36]. From…”

Section: Eis Measurementsmentioning

confidence: 99%

Effect of duty cycle and electrolyte additive on photocatalytic performance of TiO2-ZrO2 composite layers prepared on CP Ti by micro arc oxidation method

Babaei

Dehghanian

Taheri

et al. 2016

Surface and Coatings Technology

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“…The measured impedance data can be used to extract equivalent values of resistances and capacitances if a circuit model is assumed a priori, though there is not a unique model or even necessarily a one-to-one correspondence between circuit elements and the underlying physical processes [96]. Figure 3 shows typical circuit models, and Figure 4 shows example impedance data.…”

Section: Data Fittingmentioning

confidence: 99%

Label‐Free Impedance Biosensors: Opportunities and Challenges

2007

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Impedance biosensors are a class of electrical biosensors that show promise for point-of-care and other applications due to low cost, ease of miniaturization, and label-free operation. Unlabeled DNA and protein targets can be detected by monitoring changes in surface impedance when a target molecule binds to an immobilized probe. The affinity capture step leads to challenges shared by all label-free affinity biosensors; these challenges are discussed along with others unique to impedance readout. Various possible mechanisms for impedance change upon target binding are discussed. We critically summarize accomplishments of past label-free impedance biosensors and identify areas for future research.

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“…EIS serves an effective technique for interrogating the kinetics at interfaces and to distinguish between the various mechanisms that govern charge transfer [42] and [43]. Given the inherent roughness of the BPPGE, the constant phase angle element (CPE), in which the double layer capacitance is replaced by CPE in the Randles' model [43] was used to explain the EIS data obtained in this work. The impedance data were fitted to an equivalent circuit using the FRA software package for complex non-linear least squares (NNLS) calculations based on the EQUIVCRT programme.…”

Section: Electrochemical Impedance Spectroscopic Investigationsmentioning

confidence: 99%