An electrochemical impedance and spectroelectrochemical study of the polypyrrole–flavin composite electrode

1998 ◽  
Vol 449 (1-2) ◽  
pp. 111-119 ◽  
Author(s):  
C. Bonazzola ◽  
E.J. Calvo
Keyword(s):  
Composite Electrode ◽  
Electrochemical Impedance

Study on Activated Carbon /Polyaniline Electrode Materials for Supercapacitorsts

2010 ◽  
Vol 97-101 ◽  
pp. 1582-1585 ◽  
Author(s):  
Yan Hong Tian ◽  
Bo Rong Wu ◽  
Ding Wen Mao
Keyword(s):  
Activated Carbon ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Reference Electrode ◽  
Bet Surface Area ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Composite Surface ◽  
Pani Composite

Activated carbon (AC)/polyaniline (PANI) composite electrode materials were synthesized in this article. The effect of preparation such as BET surface area and porous size of AC on the electrochemical performances of AC/PANI composite material was investigated. The electrochemical performances of the composite were tested with cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectrometry in 6mol/L KOH solution using Hg/HgO as reference electrode. Composite surface morphology was examined by scanning electron microscope (SEM). The result shows that when the ratio of AC to aniline increases, the conversion of aniline and the capacitance value of composite also increase in keeping the ratio of AC to aniline constant. When AC: aniline : (NH4)2S2O8 =7:1:1, the conversion of aniline up to more than 95% and the capacitance value of electrode materials increased from 239F/g(pure AC) to 409F/g, which is 71.1% higher than pure AC. Pore structure of AC also has great effect on electrochemical performances of electrode material. With the increase of proportion of mesoporous, the electrochemical properties of composite are greatly increased.

Olivine electrode engineering impact on the electrochemical performance of lithium-ion batteries

2010 ◽  
Vol 25 (8) ◽  
pp. 1656-1660 ◽  
Author(s):  
Wenquan Lu ◽  
Andrew Jansen ◽  
Dennis Dees ◽  
Gary Henriksen
Keyword(s):  
Hybrid Electric Vehicle ◽  
Composite Electrode ◽  
Lithium Iron Phosphate ◽  
Electrochemical Impedance ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
High Energy ◽  
Discharge Performance ◽  
Energy And Power Density

High energy and power density lithium iron phosphate was studied for hybrid electric vehicle applications. This work addresses the effects of porosity in a composite electrode using a four-point probe resistivity analyzer, galvanostatic cycling, and electrochemical impedance spectroscopy (EIS). The four-point probe result indicates that the porosity of composite electrode affects the electronic conductivity significantly. This effect is also observed from the cell's pulse current discharge performance. Compared to the direct current (dc) methods used, the EIS data are more sensitive to electrode porosity, especially for electrodes with low porosity values.

Preparation and Properties of Poly-2,5-dihydroxyaniline/Activated Carbon Composite Electrode

2012 ◽  
Vol 190-191 ◽  
pp. 528-533
Author(s):  
Miao Sun ◽  
Wei Wang ◽  
Ben Lin He ◽  
Ming Liang Sun ◽  
Fan Sun ◽  
...  
Keyword(s):  
Electrochemical Method ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Carbon Composite ◽  
Galvanostatic Charge ◽  
Acid Aqueous Solution ◽  
Carbon Composite Electrode ◽  
A Current ◽  
Charge Discharge ◽  
Discharge Test

Poly-2, 5-dimethoxyaniline (PDMA) coating was successfully prepared by electrochemical method on the surface of active carbon (AC) electrodes in oxalic acid aqueous solution. The resulted coating was hydrolyzed to produce poly-2,5-dihydroxyaniline (PDHA) to enhance the capacitance of the composite electrode. Scanning electron microscope (SEM), cyclic voltammetry (CV), galvanostatic charge/discharge test, and electrochemical impedance spectroscopy (EIS) were used to investigate the properties of these electrodes. A comparative analysis on the electrochemical properties of bare-carbon electrode was also conducted under similar conditions. The specific capacitance of the PDHA/AC composite electrode was 947.04 F•g-1 between 0.0 and 1.0 V at a current density of 3.0 mA•cm-2 in 0.5 M H2SO4 electrolyte. The capacitance retention of composite electrode was about 89.2% during 700 charge-discharge cycles.

Preparation and Characterization of Pt/YSZ Composite Electrode

2009 ◽  
Vol 66 ◽  
pp. 202-205
Author(s):  
Zhian Luo ◽  
Jian Zhong Xiao
Keyword(s):  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Composite Electrodes ◽  
Stabilized Zirconia ◽  
Remarkable Effect ◽  
Surface And Interface ◽  
Ceramic Injection Molding ◽  
Pt Electrodes ◽  
Zirconia Electrolyte

Substrates of ytrria stabilized zirconia electrolyte were prepared by the ceramic injection molding, and then composite electrode slurry was made of platinum powder and yttria stabilized zirconia powder by ball milling, and then was brushed on both surfaces of the zirconia substrate. After this, the Pt/YSZ composites were sintered on the YSZ substrate under various temperatures. The microstructure of the surface and interface of the electrodes was characterized by scanning electronic microscope, and the results showed that the sintering temperature of the electrode has a remarkable effect on the microstructure of the composite electrode, and that the electrode and substrate was interconnected and interpenetrated. The electrochemical properties of the as-prepared electrodes were investigated by electrochemical impedance spectroscopy (EIS). The EIS experimental results reveal that the Pt/YSZ composite electrodes show the favorable electrochemical catalysis performance compared with the Pt electrodes.

Electrochemical hydrogen peroxide sensor based on cobalt phthalocyanine captured in polyaniline film on a glassy carbon electrode

2012 ◽  
Vol 16 (04) ◽  
pp. 380-389 ◽  
Author(s):  
Berna Çeken ◽  
Mehmet Kandaz ◽  
Atıf Koca
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Pani Film ◽  
Cobalt Phthalocyanine ◽  
Carbon Electrode ◽  
Hydrogen Peroxide Sensor ◽  
Vis Spectroscopy

This work demonstrated preparation, characterization, and application of a cobalt phthalocyanine based enzymeless/mediatorless hydrogen peroxide sensor. The cobalt phthalocyanine (CoPc) was retained in polyaniline (PANI) film on a glassy carbon electrode during electrochemical polymerization of aniline and consequently a novel composite electrode (GCE/PANI/ CoPc ) for the electrochemical sensor application was constructed. The CoPc functionalized composite electrode, GCE/PANI/ CoPc , was evaluated by voltammetry, electrochemical impedance spectroscopy, and UV-vis spectroscopy. The results displayed retaining of the CoPc molecules in the PANI film on the GCE electrode. Presence of CoPc in PANI increased conductivity of the composite on the electrode. Sensing performance of the GCE/PANI/ CoPc composite electrode to H2O2 were evaluated in detail with respect to the selectivity, reproducibility, repeatability, stability, linear concentration range, and sensitivity with voltammetric and double potential step chronoamperometric techniques. The GCE/PANI/ CoPc composite electrode gives a linear range for H2O2 between 2 and 18 μM H2O2 with sensitivities of 1.55 A.M-1 during the cathodic SWV scan and with sensitivities of 4.01 A.M-1 during the anodic SWV scan. A direct application of the sensor was performed in a real working condition, for the detection of hydrogen peroxide produced from the reaction between the glucose and glucose oxidase enzyme.

Graphene-NiO Composite Electrode for Supercapacitors

2011 ◽  
Vol 345 ◽  
pp. 75-78 ◽  
Author(s):  
Wei Zhou ◽  
Man Lin Tan ◽  
Xiao Song Zhou
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Graphene Sheets ◽  
Supercapacitor Electrode ◽  
Scan Rate

In this paper, a facilesolution method was employed to synthesize the graphene-NiO composite. SEM and XRD results indicated the graphene sheets were covered by the NiO nanoplates. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to measure the electrochemical properties of the composite. The specific capacitance reached 1292F/g at a scan rate of 5mV/s. The results show that this composite is a promising material for supercapacitor electrode.

Hybrid Organic-Inorganic Electrode-Membranes Based on Organo-Polysiloxane/Macrocycle Systems

1998 ◽  
Vol 519 ◽  
Author(s):  
A. Jiménez-Morales ◽  
J.C. Galvan ◽  
P. Aránda ◽  
E. Ruiz-Hitzky
Keyword(s):  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Ion Selectivity ◽  
Sol Gel ◽  
Solution Concentration ◽  
Complexing Agents ◽  
Cavity Size ◽  
Sol Gel Process ◽  
Porous Supports

AbstractSpecific complexing agents for alkaline ions such as some crown-ethers of different intramolecular cavity size (12-crown-4, 15-crown-5 and 18-crown-6) are incorporated into a organo-polyorganosiloxane network generated via the sol-gel process. The resulting xerogels embody macrocycle compounds with different ion-selectivity. These xerogels are deposited onto porous supports (borosilicate, polyacrylonitrile,…) to obtain new composite electrode- membranes. The electrochemical characterization of the membranes and the electrode- membranes by electrochemical impedance spectroscopy (EIS) shows information about the reversible behavior and the ion resistance of the membranes, which are a function of both, nature and content of the entrapped macrocycle as well as the salt solution concentration. The electrochemical response of these systems acting as electrode-membranes shows their sensitivity towards different metal ions at variable concentrations.

Hybrid Supercapacitors Based on Polyaniline and Carbon Aerogels Composite Electrode Materials

2011 ◽  
Vol 391-392 ◽  
pp. 18-22
Author(s):  
Zheng Jin ◽  
Dong Yu Zhao ◽  
Bo Hong Li ◽  
Xiao Min Ren ◽  
Shan Tao Yan ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Carbon Aerogels ◽  
Composite Electrodes ◽  
Long Cycle Life ◽  
Hybrid Supercapacitors

The purpose of this paper is to develop feasible composite electrodes with a long cycle life and large specific capacitance and to investigate optimal ratio between aniline and carbon aerogels (CA) materials. The characterization of the composite electrode materials was studied by using scanning electron microscopy (SEM), electrochemical impedance spectroscopy, cyclic voltammetry (CV) and the constant charge-discharge. The specific capacitance of the composite electrode materials, measured using cyclic voltammetry at scan rate of 1mV•s-1, was found to be 1139.66F•g-1. For a simple supercapcitor, the highest specific capacitance (127.53 F•g-1 at 30mA) is obtained at ratio between aniline and CA is 1:4.

The Hydrogen Evolution Reaction on Ni Electrode Material Modified with Molybdenum(IV) Oxide and Chromium(III) Oxide Powders

2015 ◽  
Vol 228 ◽  
pp. 273-276
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz
Keyword(s):  
Steady State ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Room Temperature ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Nickel Matrix ◽  
Oxide Powders ◽  
Galvanostatic Conditions

The Ni+MoO2and Ni+Cr2O3composite coatings were prepared by the electrodeposition under the galvanostatic conditions (jdep= -200 mA cm-2) from the nickel bath containing powder of MoO2or Cr2O3. Studies of hydrogen evolution reaction (HER) in 5 M KOH solution at room temperature were conducted using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. It was ascertained that the HER rate is higher for the Ni+MoO2composite electrode in comparison with the Ni+Cr2O3composite electrode due to the presence of Mo in the nickel matrix.

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