Relevant bibliographies by topics / Sevcik equation

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Sevcik equation'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Sevcik equation"

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Neghmouche, N. S., and Touhami Lanez. "Calculation of Electrochemical Parameters Starting from the Polarization Curves of Ferrocene at Glassy Carbon Electrode." International Letters of Chemistry, Physics and Astronomy 9 (September 2013): 37–45. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.9.37.

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This work is a contribution to the calculation of electrochemical parameters from the polarization curves of ferrocene. The parameters are: The anodic (Epa) and the cathodic (Epc) peak potentials, as well as the corresponding anodic (ipa) and cathodic (ipc) peak currents, were obtained at different scan rates (0.05, 0.10, 0.30, 0.50 V.s-1). The half-wave potentials (E1/2) of the couple in the investigated solvents have been evaluated. The diffusion coefficients (D) have been calculated using the Randles-Sevcik equation.
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Vashistha, Vinod Kumar, Neeraj Sharma, Anuj Kumar, and Usha Rani Sharma. "Synthesis and Electrochemical Studies of Hexamethyldibenzotetraaza N4-Macrocyclic Complexes of Ni(II) and Cu(II) Metal ions." Asian Journal of Chemistry 31, no. 9 (July 31, 2019): 2116–20. http://dx.doi.org/10.14233/ajchem.2019.21952.

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Hexamethyldibenzotetraaza[14]annulene type macrocyclic complexes of Ni(II) and Cu(II) have been synthesized by template method. These macrocyclic complexes were characterized by molar conductance, elemental analysis, IR, UV-visible, mass spectra and cyclic voltammetry. On the basis of electronic studies saddle shape distorted octahedral structure have been assigned to these macrocyclic complexes. The redox behaviour of Ni(II) and Cu(II) macrocyclic complexes showed reversible and quasi-irreversible redox process that supported by the ipc/ipa ratio which is in good agreement with Randles-Sevcik equation. These macrocyclic complexes were also studied for the antimicrobial activity against E. coli, P. aeruginosa, B. subtilis, S. aureus and C. albicans compared with gentamycin as standard drug.
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Jin, Yi. "Electrochemical Properties of GaCl3 in Ionic Liquid [C2mim][GaCl4]." Advanced Materials Research 634-638 (January 2013): 2596–99. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2596.

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Under dry argon atmosphere, the colourless and transparent ionic liquid [C2mim][GaCl4] was synthesized. Using [C2mim][GaCl4] as solvent, a solution of GaCl3with molarity 5.227×10-3 mol/cm3 was prepared at 303.15 K and there is a equilibrum between the solute and the solvent: GaCl3+ [C2mim][GaCl4] → [C2mim][Ga2Cl7]. The cyclic voltammogram of the solution had been carried out relative to Al/Al3+reference electrode, with GC working electrode and Ga counter electrode, with various scan rates from 30 to 700mV/s, in a temperature range of 303.15 to 343.15 K, respectively. The results indicated that (1) there were two processes: Ga(Ⅲ)→Ga(I)→Ga(0), which corresponded to the double reduction peaks in the cyclic voltammogram; (2) the first reduction process was a diffusion controlled and quasi-reversible process. Plotting current density of the peak vs the square root of scan rate, a series of straight lines were obtained, then the diffusion coefficients were obtained according to Randles-Sevcik equation in various temperature. The values of diffusion coefficient were fitted to Arrhenius equation with least-square method and value of diffusion activation energy, ED = 41.5 kJ/mol, was obtained from Arrhenius slope.
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Kishwar, Farah, Khalid Mohammed Khan, Rubina Perween, Anila Anwar, and Nasir Akhtar. "Quantification of Cr(VI)-Thymoquinone Complex Using Cyclic Voltammetry." Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences 59, no. 2 (June 24, 2016): 76–82. http://dx.doi.org/10.52763/pjsir.phys.sci.59.2.2016.76.82.

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Quantitative studies of Cr(VI)- thymoquinone complex have been performed by cyclic voltammetry. For this purpose glassy carbon, platinum and saturated calomel electrodes were used as working, auxiliary and reference electrodes, respectively. The effects of concentrations and metal-ligand ratios on Cr(VI)- thymoquinone complex were investigated. Effect of concentration was found to follow Randles-Sevcik equation. Calibration curve method with linear regression line confirms that cyclic voltammetry can be used for quantification of Cr(VI)-thymoquinone complex for pharmaceutical assay. Complete complex formation seems to occur at metal ligand ratio 1:1. Results indicate quasi-reversible electron transfermechanism. E° and diffusion coefficient of complex at different concentrations and metal ligand ratios were also calculated and found to be 0.244±0.01 V and 3.45´10-5 cm2s-1, respectively. The values of transfer coefficients, a and b, were found to be 0.716±0.02-1.231±0.01 and 0.814±0.01-0.906±0.01, respectively.
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Haque, Farhana, MS Rahman, Etmina Ahmed, PK Bakshi, and AA Shaikh. "A Cyclic Voltammetric Study of the Redox Reaction of Cu(II) in Presence of Ascorbic Acid in Different pH Media." Dhaka University Journal of Science 61, no. 2 (November 18, 2013): 161–66. http://dx.doi.org/10.3329/dujs.v61i2.17064.

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The electrochemical redox behavior of Cu(II), and Cu(II) in presence of ascorbic acid has been investigated at glassy carbon electrode (GCE) in aqueous phosphate buffer solution (PBS) at various pH. In the studied pH range the voltammogram consists of a cathodic and an anodic peak. Cu(II) follows one step two-electron transfer electrochemical redox reaction. The intensities of both cathodic and anodic peak current increase with increasing scan rate that are consistent with Randles-Sevcik equation. The linear behavior of peak current with the square root of scan rate indicates that the electrochemical processes are diffusion controlled. In presence of ascorbic acid both of the cathodic and anodic peak current of Cu(II) is reduced and peak positions are shifted compared to those of Cu(II) alone. These observation suggest that Cu(II) undergoes a strong interaction with ascorbic acid in the studied medium. DOI: http://dx.doi.org/10.3329/dujs.v61i2.17064 Dhaka Univ. J. Sci. 61(2): 161-166, 2013 (July)
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Beltrán-Prieto, Juan Carlos, Roman Slavík, and Karel Kolomazník. "Potentiodynamic Polarization Studies of Glycerin in Platinum Electrodes." Advanced Materials Research 1101 (April 2015): 348–51. http://dx.doi.org/10.4028/www.scientific.net/amr.1101.348.

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<span><p class="TTPAbstract"><span lang="EN-US">A three electrode system was used for the analysis of potentiodynamic polarization studies of glycerin in platinum electrodes. Particular attention was devoted to the estimation of diffusion coefficient of glycerin in platinum electrodes by the use of electrochemical techniques such as the sweep of the potential. Cyclic voltammograms were recorded at different sweep rates (0.01 and 0.07 V·s-1). Randles-Sevcik equation was taken into consideration and a linear relationship was found between </span><span lang="DE">the peak current and the square root of the voltage sweep rate from where the value of diffusion coefficient could be determined. The values of Tafel constants, useful in the understanding of electrochemical reaction kinetics are also reported in the present paper.</span><b><span lang="EN-US"><o:p></o:p></span></b></p>
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Dempírová, Ludmila, and Zdena Adamcová. "Electropolymerization of aniline and some of its derivatives." Collection of Czechoslovak Chemical Communications 54, no. 12 (1989): 3154–61. http://dx.doi.org/10.1135/cccc19893154.

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The effect of substitution on the aromatic ring of aniline and in its amino group on the potential of polymerization in aqueous medium and on the charge passed during polymerization was studied. The formation of polymer films on the working electrode and their electrochromic changes were also examined. From the electro-oxidation of aniline, the number of reversible and irreversible steps, the number of electrons exchanged and the type of oxidation mechanism were found. Thickness of a single layer of polyaniline, formed by cycling the potential in the range –0.2 V, +1.4 V(vs SCE) at a polarization rate of 5 mV/s, was estimated considering the oxidation mechanism of aniline. The electrochemical behaviour of aniline in anhydrous acetonitrile medium was also studied. It was found by blocking the m- and p-positions in aniline by a methyl substituent that polymerization of aniline occurs through the p-position. The porosity of the polymer films was estimated from the diffusion coefficient values for 1.10-3M K3[Fe(CN)]6 in 0.1M-KCl calculated from the Randles-Sevcik equation for measurements on Pt electrodes with a polymer film, compared with the tabulated values for a bare Pt electrode.
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Lee, Jun-Kyu, Jin-Seok Lee, Young-Soo Ahn, and Gi-Hwan Kang. "Efficient Recovery of Silver from Crystalline Silicon Solar Cells by Controlling the Viscosity of Electrolyte Solvent in an Electrochemical Process." Applied Sciences 8, no. 11 (November 2, 2018): 2131. http://dx.doi.org/10.3390/app8112131.

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We present electrowinning of silver (Ag) from crystalline silicon (c-Si) solar cells using a solution of methanesulfonic acid (MSA) as the electrolyte. Ag dissolved effectively in MSA because of its high solubility in MSA; however, the electrochemical recovery of Ag from MSA solutions was found to be inefficient because of the low mobility of Ag ions in MSA, owing to its high viscosity. Therefore, we decreased the viscosity of MSA by adding deionized (DI) water, as a possible method for enhancing the mobility of Ag ions. The concentrations of added DI water were 0, 1.1, 5.0, 9.3, and 20.8 M, respectively. Further, we performed cyclic voltammetry for each solution to calculate the diffusion coefficient using the Randles–Sevcik equation, and analyzed the viscosity of MSA solutions depending on the concentration of added water using a rheometer. The morphologies of the electrochemically recovered Ag particles changed with variations in the amount of the added water, from branch-like structures to dendritic structures with a decreasing size. Moreover, the cathodic current efficiency increased considerably with increasing concentration of the added DI water. Finally, we recovered Ag with >99.9% (3N) purity from c-Si solar cells by electrowinning, as determined by glow discharge mass spectrometry.
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Ngamchuea, Kamonwad, Shaltiel Eloul, Kristina Tschulik, and Richard G. Compton. "Planar diffusion to macro disc electrodes—what electrode size is required for the Cottrell and Randles-Sevcik equations to apply quantitatively?" Journal of Solid State Electrochemistry 18, no. 12 (October 28, 2014): 3251–57. http://dx.doi.org/10.1007/s10008-014-2664-z.

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Muhammed Mizher, Radhi. "Electrochemical Characterization of Redox FeII/FeIII Mediated by ZrO2NPs/GCE Using Cyclic Voltammetry." Nanoarchitectonics 1, no. 2 (February 12, 2020): 53–58. http://dx.doi.org/10.37256/nat.12202061.53-58.

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In this article, experimental methods based on cyclic voltammetric technique were used to study the electrochemical analysis of a new modified electrode with zirconium dioxide molecules on the glassy carbon electrode (ZrO2NPs/GCE) to characterize iron ions K4[Fe(CN)6]. These methods also allowed the study of current peaks for oxidation reduction of Fe(II)/Fe(III) using potassium chloride (KCl) solution as electrolytes at different concentration, pH, scanning rates, and stability (reliability) of which these parameters are important in assessing oxidation properties. Also, the diffusion coefficient values of oxidation-reduction reaction for iron ions on the new sensor (ZrO2 NPs/GCE) was determined using Randles-Seveik equation as Dfa = 2.03 ×10-5 cm2 /sec and Dfc = 7.12 × 10-5 cm2 /sec, respectively. It was found the modified electrode ZrO2NPs/GCE acts as a good sensor with high detection limit of iron ions in electrolyte. It can be used the modified electrode in different electrochemical applications because of its higher conductivity.
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Dissertations / Theses on the topic "Sevcik equation"

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Kynclová, Hana. "Charakterizace nanostrukturovaných elektrod pro elektrochemické biosenzory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219511.

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Nowadays it is attached to a major effort to study applications of nanoparticles in biosensors technology. We studied the effect of gold nanoparticles on the surface of the electrodes by Electrochemical Impedance Spectroscopy method and Cyclic Voltammetry. For impedance measurements was proposed substitute electrical model and cyclic voltammetry method was used to determine the electroactive surface of electrodes.
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Conference papers on the topic "Sevcik equation"

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Hamzah, I. H., Asrulnizam Abd Manaf, and O. Sidek. "A study on characteristic and reliability of fabricated microfluidic three electrodes sensor based on randle-sevcik equation." In APCCAS 2010-2010 IEEE Asia Pacific Conference on Circuits and Systems. IEEE, 2010. http://dx.doi.org/10.1109/apccas.2010.5774816.

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