Cyclic Voltammetric Studies on the Role of Electrode, Electrode Surface Modification and Electrolyte Solution of an Electrochemical Cell

Mundinamani, Shridhar; Rabinal, M. K.

doi:10.9790/5736-07924552

Cited by 17 publications

(11 citation statements)

References 18 publications

(23 reference statements)

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“…It is well known that for this system the kinetic parameters reported are highly variable even when using apparently identical electrodes and conditions (see [2][3][4][5][6][7][8][9][10][11][12][13][14] and references cited therein). Using our new approach we are able to show that this difficulty is not due to the impact of random experimental noise, since for each individual data set we are able to fit the mathematical model to the experimental data extremely accurately.…”

Section: Introductionmentioning

confidence: 99%

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)₆]^3–/4– Process

et al. 2018

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Recently, we have introduced the use of techniques drawn from Bayesian statistics to recover kinetic and thermodynamic parameters from voltammetric data, and were able to show that the technique of large amplitude ac voltammetry yielded significantly more accurate parameter values than the equivalent dc approach. In this paper we build on this work to show that this approach allows us, for the first time, to separate the effects of random experimental noise and inherent system variability in voltammetric experiments. We analyse ten repeated experimental data sets for the [Fe(CN) 6 ] 3−/4− process, again using large-amplitude ac cyclic voltammetry. In each of the ten cases we are able to obtain an extremely good fit to the experimental data and obtain very narrow distributions of the recovered parameters governing both the faradaic (the reversible formal faradaic potential, E 0 , the standard heterogeneous charge transfer rate 1 arXiv:1810.02187v1 [eess.SP] 18 Sep 2018 constant k 0 , and the charge transfer coefficient α) and non-faradaic terms (uncompensated resistance, R u , and double layer capacitance, C dl ). We then employ hierarchical Bayesian methods to recover the underlying "hyperdistribution" of the faradaic and non-faradaic parameters, showing that in general the variation between the experimental data sets is significantly greater than suggested by individual experiments, except for α where the inter-experiment variation was relatively minor. Correlations between pairs of parameters are provided, and for example, reveal a weak link between k 0 and C dl (surface activity of a glassy carbon electrode surface). Finally, we discuss the implications of our findings for voltammetric experiments more generally.

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Section: Introductionmentioning

confidence: 99%

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)₆]^3–/4– Process

et al. 2018

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“…Meanwhile, CDs/SPCE ( Figure 2 D, curve b) shows a much lower Rct value of about 27.1 kΩ, which suggested that acceleration electron transfer between the electrochemical probe [Fe(CN) 6 ] 3−/4− and electrode surface has increased due to the enhancement electrode surface area. These results can be calculated by using the Randles–Sevcik equation [ 35 ], where a CV experiment was performed in 5.0 mM Fe (CN) 6 4−/3− solution containing 0.1 M KCl at different scan rates (v) ( Supplementary Materials Figure S2 ). As a result, the electroactive surface area (A) of the bare SPCE and the CDs/SPCE electrode was determined to be 0.019 cm 2 ( Supplementary Materials Figure S2A ) and 0.054 cm 2 ( Supplementary Materials Figure S2B ), respectively, which translates to an approximately three-times improvement compared to bare SPCE ( Supplementary Materials Figure S2C ).…”

Section: Resultsmentioning

confidence: 99%

A Sensitive Impedimetric Aptasensor Based on Carbon Nanodots Modified Electrode for Detection of 17ß-Estradiol

et al. 2020

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A simple and sensitive aptasensor based on conductive carbon nanodots (CDs) was fabricated for the detection of 17ß-Estradiol (E2). In the present study, the hydrothermal synthesis of carbon nanodots was successfully electrodeposited on a screen-printed electrode (SPE) as a platform for immobilization of 76-mer aptamer probe. The morphology and structure of the nanomaterial were characterized by UV-visible absorption spectra, Fluorescence spectra, Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Moreover, cyclic voltammetry and electrochemical impedance spectroscopy were used to investigate the electrochemical performance of the prepared electrodes. Subsequently, impedimetric (EIS) measurements were employed to investigate the relative impedances changes before and after E2 binding, which results in a linear relationship of E2 concentration in the range of 1.0 × 10−7 to 1.0 × 10 −12 M, with a detection limit of 0.5 × 10−12 M. Moreover, the developed biosensor showed high selectivity toward E2 and exhibited excellent discrimination against progesterone (PRG), estriol (E3) and bisphenol A (BPA), respectively. Moreover, the average recovery rate of spiked river water samples with E2 ranged from 98.2% to 103.8%, with relative standard deviations between 1.1% and 3.8%, revealing the potential application of the present biosensor for E2 detection in water samples.

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“…After modification of the SPCE electrode with PANI/GP composite nanofibers, the peak current increases, possibly due to the higher surface area and higher conductivities of both PANI and GP. Furthermore, the ability of diffusion control by Fe(CN) 6 3−/4− ion on the electrode surface also affected the increment in peak currents [ 46 ]. The active surface area of modified electrode shows an improvement compared to bare electrode because of the higher acceleration electron transfer of Fe (CN) 6 3−/4− ion on the roughness of the electrode surface due to the presence of PANI/GP [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Polyaniline/Graphene Composite Nanofiber and Its Application as an Electrochemical DNA Biosensor for the Detection of Mycobacterium tuberculosis

Mohamad

Zaid

Abdullah

et al. 2017

Sensors

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This article describes chemically modified polyaniline and graphene (PANI/GP) composite nanofibers prepared by self-assembly process using oxidative polymerization of aniline monomer and graphene in the presence of a solution containing poly(methyl vinyl ether-alt-maleic acid) (PMVEA). Characterization of the composite nanofibers was carried out by Fourier transform infrared (FTIR) and Raman spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). SEM images revealed the size of the PANI nanofibers ranged from 90 to 360 nm in diameter and was greatly influenced by the proportion of PMVEA and graphene. The composite nanofibers with an immobilized DNA probe were used for the detection of Mycobacterium tuberculosis by using an electrochemical technique. A photochemical indicator, methylene blue (MB) was used to monitor the hybridization of target DNA by using differential pulse voltammetry (DPV) method. The detection range of DNA biosensor was obtained from of 10−6–10−9 M with the detection limit of 7.853 × 10−7 M under optimum conditions. The results show that the composite nanofibers have a great potential in a range of applications for DNA sensors.

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Cyclic Voltammetric Studies on the Role of Electrode, Electrode Surface Modification and Electrolyte Solution of an Electrochemical Cell

Abstract: The present

Cited by 17 publications

References 18 publications

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)₆]^3–/4– Process

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)₆]^3–/4– Process

A Sensitive Impedimetric Aptasensor Based on Carbon Nanodots Modified Electrode for Detection of 17ß-Estradiol

Synthesis and Characterization of Polyaniline/Graphene Composite Nanofiber and Its Application as an Electrochemical DNA Biosensor for the Detection of Mycobacterium tuberculosis

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Cyclic Voltammetric Studies on the Role of Electrode, Electrode Surface Modification and Electrolyte Solution of an Electrochemical Cell

Abstract: The present

Cited by 17 publications

References 18 publications

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)6]3–/4– Process

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)6]3–/4– Process

A Sensitive Impedimetric Aptasensor Based on Carbon Nanodots Modified Electrode for Detection of 17ß-Estradiol

Synthesis and Characterization of Polyaniline/Graphene Composite Nanofiber and Its Application as an Electrochemical DNA Biosensor for the Detection of Mycobacterium tuberculosis

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Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)₆]^3–/4– Process

Separating the Effects of Experimental Noise from Inherent System Variability in Voltammetry: The [Fe(CN)₆]^3–/4– Process