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Subject: search.filters.subject.Cyclic voltammetry

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    The electrochemical measurements investigation of NiCo2O4for electrode materials of energy storage devices by using digital holography technique
    (2021-01-01)
    Prakobsang, Tawipon
    ;
    Saei, Worawee
    ;
    Kongsubto, Thee
    ;
    Ruttanapun, Chesta
    ;
    Buranasiri, Prathan
    The electrochemical properties of NiCo2O4for using as electrode materials for the potential applications have been investigated by electrochemical measurement which composed of cyclic voltammetry (CV) and galvanostatic chargedischarge (GCD). These processes are generating the ion exchange between the electrode and electrolyte, wherein induce the surface change of the interface. Especially, since in the cycle ability measurement using the potentiostat needed to repeat the cycle into the electrode for many times, the effective of the electrode is reduced. In this research, digital holographic technique was used to investigate the different properties of interface of the NiCo2O4 electrode while operating under the various electrochemical techniques. In our DH recording, the surface change of the electrode was expose at the difference potential scan rate at 1, 5, 10, 50, 100 and 200 mV/s of CV, and the difference current densities at 1, 2, 3, 5, 10 and 20 A/g of GCD and vary times of cycle ability test every 50 cycle times to 1000 cycles. In the end the reconstructed DH images of the electrode have been used to analyze the results from electrochemical measurement.
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    Electrochemical sensor: Preparation technique based on electronic tongue in fragrance
    (2017-01-01)
    Rattanawarinchai, P.
    ;
    Krongkrachang, P.
    ;
    Chodjarusawad, T.
    ;
    Phromyothin, D.
    This research is aimed to investigate a sensing of fragrance using electronic tongue (E-tongue) based on electrochemistry by various sample preparation techniques. The E-tongue has been designed and constructed based on the pattern classification. Various fragrances have been studied to evaluate the ability of E-tongue by cyclic voltammetry (CV) and data reduction techniques by principal component analysis (PCA). In this study, a vomeronasal organ is a proposed concept for detection the odor and a medium act as a solvent to entrap the odor particles. The result indicates that this technique is able to classify samples in terms of qualitative and quantitative analysis as well.
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    Electrocatalytical of chlorophenoxycarboxylic acids at a protoporphyrin IX cobalt(III) chloride modified glassy carbon electrode
    (2005-07-15)
    Chaiyasith, Suwan
    ;
    Tangkuaram, Tanin
    ;
    Chaiyasith, Pachernchai
    Protoporphyrin IX cobalt(III) chloride (Co(ProP)Cl) was immobilized on a glassy carbon electrode (GCE) to facilitate the electrocatalytical determination of 2,4-dichlorophenoxycarboxylic acids (2,4-D) and three of its derivatives 2-(2,4-dichlorophenoxy) propionic acid (2,4-DP), 2-(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP) and 4-(2,4-dichlorophenoxy)butyric acid (2,4-DB) in aqueous solution. Co(ProP)Cl was immobilized by a spontaneous adsorption method. The electrocatalytic reduction peak of 2,4-D and its three derivatives was found at -1.12 V (vs. Ag/AgCl). Employing chronoamperometry, the highest limiting current was found for a modified GCE with 1 mM Co(ProP)Cl in acetonitrile|water (1:3; v/v) containing 0.1 M KCl at -1.15 V. Good linear response of the modified electrode was found in 10-400 μM for 2,4-D, 2,4-DP and 2,4,5-TP; and in 10-300 μM for 2,4-DB. The detection limits were estimated as 0.98, 1.14, 0.89, and 2.77 μM for 2,4-D, 2,4-DP, 2,4,5-TP and 2,4-DB, respectively. The lifetime of the Co(ProP)Cl-GCE was seven times for 2,4-D; eight times for 2,4,5-TP; and six times for 2,4-DP and 2,4-DB. © 2005 Elsevier B.V. All rights reserved.