Electrochemical Preparation and Application of PEDOT/Ferrocene Modified Electrode

2015 ◽  
Vol 727-728 ◽  
pp. 61-64 ◽  
Author(s):  
Xin Fei Zhou ◽  
Yan Hui Song ◽  
Kun Yun He ◽  
Hai Tao Zheng ◽  
Shinichiro Suye
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Modified Electrode ◽  
Gold Electrode ◽  
Electrochemical Impedance ◽  
Electrochemical Preparation ◽  
Scanning Electron

A highly stable and sensitive electrochemical sensor was developed by electropolymerisation of poly (3, 4-ethylenedioxythiophene) (PEDOT) and ferrocene (Fc) on gold electrode for the determination of ascorbic acid (AA). The PEDOT/Fc composite film modified Au electrode was characterized by field emission scanning electron microscope，electrochemical impedance spectroscopy and cyclic voltammetry. Compared with bare electrode, the PEDOT/Fc modified electrode exhibited excellent electrocatalytic activity toward the oxidation of AA.

scholarly journals Electrochemical Detection of Dopamine at a Gold Electrode Modified with a Polypyrrole–Mesoporous Silica Molecular Sieves (MCM-48) Film

2018 ◽  
Vol 20 (1) ◽  
pp. 111 ◽  
Author(s):  
Izabela Zablocka ◽  
Monika Wysocka-Zolopa ◽  
Krzysztof Winkler
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Modified Electrode ◽  
Electrochemical Detection ◽  
Molecular Sieves ◽  
Gold Electrode ◽  
Square Wave Voltammetry ◽  
Wave Voltammetry

A gold electrode modified with a polypyrrole–mesoporous silica molecular sieves (polypyrrole—MCM-48) nanostructure film was used for the electrochemical determination of small concentrations of dopamine (DA) by cyclic voltammetry and square-wave voltammetry techniques. This electrode showed good electrocatalytic activity for the oxidation of dopamine. The oxidation potential of dopamine was decreased significantly compared with that obtained at the bare gold electrode. The observed linear range for the determination of the dopamine concentration, without interferents through cyclic voltammetry measurements, was from 10 μM to 1.2 mM (R2 = 0.9989) for the gold electrode modified with the polypyrrole—MCM-48 nanostructure, with a detection limit of 2.5 μM. In the case of square-wave voltammetry, the linear range was 2–250 μM, with a correlation coefficient of 0.9996, and the detection limit was estimated to be 0.7 μM. The effects of interferents, such as ascorbic acid (AA) and uric acid (UA), on the electrochemical detection of dopamine were also examined. The modified electrode can successfully separate the oxidation potentials for ascorbic acid and dopamine, shifting the oxidation peak potential of ascorbic acid to a more positive potential, and significantly decreasing the peak current. The presence of ascorbic acid increased the sensitivity of dopamine determination at the modified electrode, and the detection limit was estimated to be 0.5 μM with 0.1 mM ascorbic acid to imitate physiological solutions. Additionally, studies showed that the presence of uric acid does not affect the electrochemical detection of dopamine. The modified electrode can be successfully applied for the quantitative analysis of dopamine both with and without interferents.

scholarly journals An Electrochemical Sensor Based On Graphite Electrode Modified With Silica Containing 1-N-Propyl-3-Methylimidazolium Species For Determination Of Ascorbic Acid

2019 ◽  
Vol Vol. 14, No.1 ◽  
pp. 5-14 ◽  
Author(s):  
Anastasiya Tkachenko ◽  
Mykyta Onizhuk ◽  
Oleg Tkachenko ◽  
Leliz T. Arenas ◽  
Edilson V. Benvenutt ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Pharmaceutical Formulations ◽  
Differential Pulse ◽  
Long Term Stability ◽  
Diffusion Limited

In the present study, an electrochemical sensor based on the electrode (SiMImCl/C) consisting of graphite and silica, grafted with 1-n-propyl-3-methylimidazolium chloride was used for ascorbic acid (AA) quantification in pharmaceuticals and food formulations. Cyclic voltammetry and electrochemical impedance spectroscopy were applied for electrochemical characterization of the SiMImCl/C electrode. The cyclic voltammetry study revealed that the oxidation of AA on this electrode is an irreversible process, realized by adsorption and diffusion limited step. The differential pulse voltammetry was applied to develop a procedure for the AA determination. The linear range was found to be 0.3–170 μmol L-1 and the limit of detection – 0.1 μmol L-1. The proposed SiMImCl/C electrode has long term stability and does not show electrochemical activity towards the analytes, which commonly coexist with AA. The sensor was successfully used for quantification of AA in food and pharmaceutical formulations.

Epoxy Resin Modified with PEDOT/PSS and Corrosion Protection of Steel

2012 ◽  
Vol 560-561 ◽  
pp. 947-951
Author(s):  
Jian Hou ◽  
Guang Zhu ◽  
Jing Kun Xu ◽  
Jun Tao Wang ◽  
Yao Huang
Keyword(s):  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Scanning Electron Microscope ◽  
Epoxy Resin ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Protection Efficiency ◽  
Epoxy Paint ◽  
Scanning Electron

An epoxy paint containing PEDOT/PSS was described herein. The corrosion behavior of steel samples coated with the paint was investigated in seawater. For this purpose, electrochemical impedance spectroscopy was utilized and surface morphology of coatings after corrosion was observed using scanning electron microscope. It was found that the addition of small PEDOT/PSS to the epoxy resin increased its corrosion protection efficiency. Meanwhile, the possible mechanism was discussed.

scholarly journals ANALISIS PENGARUH LAJU PUTAR TERHADAP KOROSI BAJA KARBON API 5LX65 MENGGUNAKAN METODE ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

2012 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Agus Solehudin ◽  
Asep Lukman
Keyword(s):  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Electrochemical Impedance ◽  
Energy Dispersive ◽  
X Ray ◽  
Scanning Electron

Pada percobaan ini, telah dipelajari pengaruh laju putar terhadap laju korosi baja karbon API 5LX65 yang direndam selama 24 jam dalam larutan NaCl 3,5% + 500 mg/L H2S menggunakan metode EIS (Electrochemical Impedance Spectroscopy) pada suhu 50oC dan pH 4 dengan variasi laju putar 50 rpm, 150 rpm, dan 250 rpm. Hasil percobaan memperlihatkan pergeseran dan penyempitan kurva setengah lingkaran impedansi imaginer terhadap impedansi real, dengan meningkatnya laju putar dari 50 rpm sampai dengan 250 rpm. Hal ini mengindikasikan bahwa aktifitas pelarutan baja meningkat dengan percepatan laju putar. Nilai Cdl meningkat dengan meningkatnya laju putar. Nilai tahanan polarisasi (Rp) semakin menurun dengan meningkatnya laju putar, sementara nilai tahanan larutan (Rs) relatif tidak berubah. Potensial korosi pada laju putar 50 rpm, 150 rpm dan 250 rpm stabil  pada -517 mV hingga -508 mV terhadap Ag/AgCl. Gabungan pengamatan Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) dan X-Ray Diffractomer (XRD) menunjukkan terbentuknya lapisan produk korosi. Hasil analisis XRD spesimen uji yang dikorosikan pada suhu 50oC selama 24 jam menunjukkan bahwa lapisan produk korosi mengandung besi sulfida (FeS). Morfologi permukaan spesimen ini memperlihatkan adanya korosi sumuran.Kata kunci: laju putar, korosi, baja karbon, EIS, H2S

scholarly journals Detection of Colchicine using p-Sulfonated Calix[4]arene Modified Electrode

2019 ◽  
Vol 31 (11) ◽  
pp. 2663-2668
Author(s):  
Tao-Tao Pang ◽  
Xu-Yan Zhang
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
High Sensitivity ◽  
Matching Effect ◽  
Selective Determination ◽  
Colchicine Poisoning ◽  
Electrochemically Active ◽  
Stabilizing Factors

Complex characteristics of p-sulfonated calix[4]arene (SC4A) and colchicine were examined using various techniques. Electrochemical impedance spectroscopy results enabled observation of the colchicine-SC4A interaction, and indicated that SC4A had high sensitivity to colchicine with a detection limit (S/N = 3) of 2 × 10-9 mol L-1. Cyclic voltammetry results indicated that the structural matching effect and the electrostatic interaction were the dominant stabilizing factors for the host-guest complexes of colchicine and SC4A. Molecular mechanics simulation showed that the benzene ring of colchicine entered the SC4A cavity. The sensor enabled selective determination of colchicine even in the presence of common interferences. The results indicated that it was more difficult to oxidize the non-electrochemically active complexes. This study showed that p-sulfonated calix[4]arene can be used in the detoxification of colchicine poisoning and may be effective in the clinical treatment of colchicine poisoning in the future.

The Effect of Boric Acid Addition on the Performance of a Gelled Electrolyte

2013 ◽  
Vol 712-715 ◽  
pp. 321-324
Author(s):  
Dong Liang Lu ◽  
Dang Jun Zhang ◽  
Chun Yan Duan ◽  
Tao Lin
Keyword(s):  
Cyclic Voltammetry ◽  
Electron Microscope ◽  
Boric Acid ◽  
Electrical Resistance ◽  
Corrosion Test ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Equivalent Circuit Analysis ◽  
Scanning Electron

The aim of this study is to evaluate the effect of boric acid as an additive for gelled electrolytes. Cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and an equivalent circuit analysis were employed to study the electrochemical performance of the gelled electrolyte with the addition of varying amounts of boric acid. Scanning electron microscope (SEM) was employed to observe the grid corrosion in corrosion test. For moderate contents of boric acid, the electrode capacity improved, as well as the oxygen evolution profermance. However, the adverse effects of boric acid were found to include increased electrical resistance, decreased hydrogen evolution overpotential and promote the corrosion of the grid. The experimental results indicates that the optimum content was 0.4wt.%.

Supramolecular p-sulfonated calix[4,6,8]arene for tryptophan detection

2014 ◽  
Vol 92 (12) ◽  
pp. 1139-1144 ◽  
Author(s):  
Tao-Tao Pang ◽  
Li-Ming Du ◽  
Hai-Long Liu ◽  
Yun-Long Fu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Spectroscopy Analysis ◽  
Modeling Calculation ◽  
Potential Complex ◽  
Scanning Electron

Numerous techniques have focused on the ability of p-sulfonated calix[n]arene to form complexes with tryptophan. Scanning electron microscopy and Fourier transform infrared spectroscopy were utilized to study the organization and molecular structure of different layers of the electrode surface. Scanning electron microscopy results showed that SC4A displayed a cubic structure whereas SC6A and SC8A displayed dendrite structures. The electrochemical properties and potential complex formation between SCnA and tryptophan were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry experiments showed that the gold electrode was successfully functionalized by self-assembled cysteamine and SC4A. Electrochemical impedance spectroscopy results showed the observation of the tryptophan–SCnA interaction and indicated that SC4A had the highest sensitivity to tryptophan and allowed 2.04 μg L−1 tryptophan to be detected. Electrochemical impedance spectroscopy analysis and molecular modeling calculation confirmed that SC4A has higher tryptophan sensitivity than SC6A and SC8A.

Effect of Additives on Photo-Aging Performance of Polyurethane Coating

2011 ◽  
Vol 291-294 ◽  
pp. 211-214
Author(s):  
Bin Xiang ◽  
Ren Qing Zhu ◽  
Hai Yun He ◽  
Zhong Cheng Xu ◽  
Shi Chen
Keyword(s):  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Uv Curing ◽  
Xenon Lamp ◽  
Polyurethane Coating ◽  
Synergy Effect ◽  
Effect Of Additives ◽  
Scanning Electron ◽  
Aging Performance

Polyurethane (PU) coatings with additives, such as UV-curing monomers and oligomers, ultraviolet absorbing (UVA) and hindered amine (HALS), were accelerated with Xenon lamp to study the effect of additives on photo aging performance of PU coatings. The ageing behavior of samples was evaluated with gloss-meter, chromatic meter, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM).The results indicated that the anti-aging of coating was improved by the synergy effect of 1.5wt.% HALS(Tinuvin 292), 3wt.% UV-curing resin (611B-85) and 1wt.% UVA(UV1130).

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