Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation

Chulkin, Pavel; Data, Przemysław

doi:10.3791/56611

Cited by 11 publications

(7 citation statements)

References 19 publications

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“…The impedance data can be perfectly fitted with a simple equivalent circuit model comprising two resistors in series ( R 1 and R ct ), and one capacitor ( C dl ) in parallel to R ct , as shown in the inset. This indicates that the charge transfer resistance is significantly higher than diffusion, [ 33 ] as expected for largely open substrates such as SS‐mesh. An ohmic resistance ( R 1) related to connectors and the electrolyte solution of 1.8 Ω was observed for both SS‐mesh and Ni foam, while in carbon paper R 1 increased to 2.8 Ω.…”

Section: Resultsmentioning

confidence: 85%

Non‐Stoichiometric NiFeMo Solid Solutions; Tuning the Hydrogen Adsorption Energy via Molybdenum Incorporation

Rafei

García

et al. 2022

Adv Materials Inter

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in a slow HER kinetics, while on the upside Ni offers several positive characteristics, such as high conductivity, stability and relatively high earth abundance. [1,3] Since the 1960's there has been a significant effort to improve the catalytic activity of Ni-based electrocatalysts with a large variety of promising candidates such as nickel hydroxides, dichalcogenides, phosphides, carbides, and others. [1,4] Generally, the catalytic activity can be enhanced by increasing the active surface area by tuning the catalysts morphology (e.g., production of nanowires, nanosheets, nanoparticles, etc.) and improving the intrinsic activity of the available active sites (e.g., by alloying, doping, defect engineering,

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Section: Resultsmentioning

confidence: 85%

Non‐Stoichiometric NiFeMo Solid Solutions; Tuning the Hydrogen Adsorption Energy via Molybdenum Incorporation

Rafei

García

et al. 2022

Adv Materials Inter

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“…The difference between the two values is probably caused by the dynamics of electric charge transfer across the anodized layer [ 44 ]. The values of capacitance of the anodized layers are independent of the voltage of anodization, signaling that the layers show similar physical and electrochemical properties [ 45 ]. Surfaces anodized at 75 V show significantly lower values for both the layers’ resistance and capacitance.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical, Biological, and Technological Properties of Anodized Titanium for Color Coded Implants

et al. 2023

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Anodization coloring of titanium tools or implants is one of the common methods for the differentiation of each application by its size or type. Commercial purity titanium grade 4 plates (50 × 20 × 0.1 mm) were tested to obtain their electrochemical and other technological properties. The coloring process was done using the potential of 15, 30, 45, 60, and 75 Volts for 5 s in 1 wt. % citric acid in demineralized water solution. Organic acids solutions generally produce better surface quality compared to inorganic acids. The contact angle of colored surfaces was measured by the sessile drop method. Electrochemical impedance spectroscopy and potentiodynamic polarization were used for the determination of selected electrochemical and corrosion parameters of the tested surfaces. It was found that the anodization process decreases corrosion potential significantly. It was also confirmed that a higher potential used for anodization results in higher polarization resistance but also a decrease in corrosion potential. The anodization process at 75 V produces surfaces with the lowest corrosion rate under 1 nm/year and the noblest corrosion potential. It was confirmed that the anodization process in citric acid does not affect titanium cytotoxicity.

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“…Electrochemical impedance spectroscopy (EIS) is a sensitive EC technique for evaluating charge transfer processes, such as double-layer capacitance, impedance and the solution resistance within the interface between an electrode and an electrolyte [114]. EIS provides some advantages as a sensing technique; for example, the samples are not destroyed during analysis, and it is simple to operate while providing a large amount of information that is obtained by detailed analysis of the data [115].…”

Section: Electrochemical (Ec) Aptasensors For Mycotoxinmentioning

confidence: 99%

Recent Advances in Conventional Methods and Electrochemical Aptasensors for Mycotoxin Detection

Ong

Pike

Tan

2021

Foods

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The presence of mycotoxins in foodstuffs and feedstuffs is a serious concern for human health. The detection of mycotoxins is therefore necessary as a preventive action to avoid the harmful contamination of foodstuffs and animal feed. In comparison with the considerable expense of treating contaminated foodstuffs, early detection is a cost-effective way to ensure food safety. The high affinity of bio-recognition molecules to mycotoxins has led to the development of affinity columns for sample pre-treatment and the development of biosensors for the quantitative analysis of mycotoxins. Aptamers are a very attractive class of biological receptors that are currently in great demand for the development of new biosensors. In this review, the improvement in the materials and methodology, and the working principles and performance of both conventional and recently developed methods are discussed. The key features and applications of the fundamental recognition elements, such as antibodies and aptamers are addressed. Recent advances in aptasensors that are based on different electrochemical (EC) transducers are reviewed in detail, especially from the perspective of the diagnostic mechanism; in addition, a brief introduction of some commercially available mycotoxin detection kits is provided.

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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation

Cited by 11 publications

References 19 publications

Non‐Stoichiometric NiFeMo Solid Solutions; Tuning the Hydrogen Adsorption Energy via Molybdenum Incorporation

Non‐Stoichiometric NiFeMo Solid Solutions; Tuning the Hydrogen Adsorption Energy via Molybdenum Incorporation

Electrochemical, Biological, and Technological Properties of Anodized Titanium for Color Coded Implants

Recent Advances in Conventional Methods and Electrochemical Aptasensors for Mycotoxin Detection

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