scholarly journals Influence of Concentration and Electrodeposition Time on the Electrochemical Supercapacitor Performance of Poly(3,4-Ethylenedioxythiophene)/Graphene Oxide Hybrid Material

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Nur Hawa Nabilah Azman ◽  
Hong Ngee Lim ◽  
Yusran Sulaiman
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Electrochemical Impedance ◽  
Galvanostatic Charge ◽  
Supercapacitive Performance ◽  
Electrodeposition Time ◽  
Electrochemical Supercapacitor ◽  
Supercapacitor Performance ◽  
Energy And Power Density ◽  
Charge Discharge

Poly(3,4-ethylenedioxythiophene)/graphene oxide (PEDOT/GO) composites with wrinkled paper-like sheets morphology were electropolymerized potentiostatically at 1.2 V with different electrodeposition times (1–30 min) and various concentrations of GO (0.5, 1.0, 1.5, and 2.0 mg/mL). The electrochemical properties of PEDOT/GO composites as an electrode material for supercapacitor were investigated using cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD). The CV results revealed that PEDOT/GO containing 1.0 mg/mL GO and electropolymerized for 10 minutes exhibited the highest specific capacitance (157.17 F/g). This optimum PEDOT/GO was found to have energy and power density of 18.24 W/kg and 496.64 Wh/kg, respectively, at 1.0 A/g current density. The resistance of charge transfer obtained for PEDOT/GO is very low (13.10 Ω) compared to PEDOT (638.98 Ω), proving that PEDOT/GO has a good supercapacitive performance due to the synergistic effect of the high conductivity of PEDOT and large surface area of GO.

scholarly journals Cyclic Voltammetry and Galvanostatic Charge-Discharge Analyses of Polyaniline/Graphene Oxide Nanocomposite based Supercapacitor

2020 ◽  
Vol 3 (1) ◽  
pp. 14-26
Author(s):  
MOHD ASYADI 'AZAM MOHD ABID ◽  
Mohd Izham Radzi ◽  
Muazzin Mupit ◽  
Hisyamuddin Osman ◽  
Rose Farahiyan Munawar ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Galvanostatic Charge ◽  
Charge Discharge

scholarly journals Capacitive behavior of functionalized activated carbon-based all-solid-state supercapacitor

2021 ◽  
Author(s):  
Kyu Seok Lee ◽  
Ye Ji Seo ◽  
Hyeon Taek Jeong
Keyword(s):  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Solid State ◽  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Capacitive Behavior ◽  
Charge Discharge ◽  
Discharge Curves

AbstractIn this report, we incorporate activated carbon (AC) onto aluminum substrate via doctor blade method to produce an all-solid-state supercapacitor. The electrochemical properties of the all-solid-state supercapacitor were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Galvanostatic charge/discharge tests also were carried out to exhibit stability of the AC-based supercapacitor. The impedance and charge/discharge curves of the all-solid-state supercapacitor showed good capacitive behavior after functionalized AC. The highest specific capacitance obtained for the AC-based supercapacitor was 106 F g−1. About 160% of specific capacitance increased after functionalization of the AC, which indicated that modification of the AC by nitric acid was able to introduce functional groups on the AC and improve its electrochemical performances.

Microwave-Assisted Synthesis of Graphene Oxide-MnO2 Composites for Supercapacitors

2014 ◽  
Vol 936 ◽  
pp. 607-612
Author(s):  
Ying Wen Duan ◽  
Xun Sun ◽  
Hong Yu Zhao ◽  
Zhi Bo Liu
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Current Density ◽  
Microwave Assisted Synthesis ◽  
Random Shape ◽  
Galvanostatic Charge ◽  
Microwave Assisted ◽  
Large Numbers ◽  
Microwave Assisted Method ◽  
Charge Discharge

Graphene oxide-MnO2 (GO-MnO2) was successfully synthesized by microwave-assisted method with the substrate of GO covered by MnO2. MnO2 contained disordered pore structure and aggregate of random shape. GO exhibited layer-like shape and had a large numbers of functional groups on its surface. The electrochemical measurements were employed by cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD), the results showed that the GO-MnO2 composite had good capacitive performance, the maximum of specific capacitance was 127 F g-1 at the current density of 100 mA g-1.

scholarly journals Reduced Graphene Oxide Supported Antimony Species for High-Performance Supercapacitor Electrodes

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Mateusz Ciszewski ◽  
Andrzej Mianowski ◽  
Ginter Nawrat ◽  
Piotr Szatkowski
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Symmetric System ◽  
Galvanostatic Charge ◽  
Reduced Graphene ◽  
Charge Discharge ◽  
Discharge Curves

Antimony species was chemically anchored on graphene oxide using antimony (III) chloride precursor and then converted to the reduced graphene oxide-antimony species composite by a well-established polyol method. The resultant composite was successfully used as supercapacitor electrodes in a two-electrode symmetric system with aqueous electrolyte. The specific capacitance calculated from the galvanostatic charge/discharge curves obtained for this composite was 289 F/g. The enhanced capacitance results were confirmed by the electrochemical impedance spectroscopy and cyclic voltammetry. The high capacitance of the reduced graphene oxide-antimony species composite arises from the combination of double-layer charging and pseudocapacitance caused by the Faradaic reactions of the intercalated antimony species and residual surface-bonded functional groups.

Li0.95Na0.05Ti2(PO4)3/C with Good Performance as Anode Material for Aqueous Rechargeable Lithium Batteries

2014 ◽  
Vol 989-994 ◽  
pp. 316-319 ◽  
Author(s):  
Jing Zhu ◽  
Yong Guang Liu ◽  
Qing Qing Tian ◽  
Ling Wang ◽  
Ji Lin Cao
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Performance ◽  
Anode Material ◽  
Lithium Batteries ◽  
Sol Gel ◽  
Nasicon Structure ◽  
Galvanostatic Charge ◽  
Rechargeable Lithium Batteries ◽  
Structure And Morphology ◽  
Charge Discharge

Li0.95Na0.05Ti2(PO4)3/C nanocomposite was prepared by sol-gel method.The structure and morphology of the samples were characterized by XRD, SEM which showed the particles had typical NASICON structure and diameter range from 400~500nm. The electrochemical performance were tested by cyclic voltammetry and galvanostatic charge–discharge. Results show Li0.95Na0.05Ti2(PO4)3/C nanocomposite exhibitsmuch better electrochemical performance than bare Li0.95Na0.05Ti2(PO4)3.

Preparation and Electrochemical Properties of LaMnO3 Powder as a Supercapacitor Electrode Material

2017 ◽  
Vol 727 ◽  
pp. 698-704 ◽  
Author(s):  
Xian Wei Wang ◽  
Xiao Er Wang ◽  
Hui Chao Zhang ◽  
Qian Qian Zhu ◽  
Dong Li Zheng ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Properties ◽  
Electrode Material ◽  
Raw Materials ◽  
Sol Gel ◽  
Galvanostatic Charge ◽  
Supercapacitor Electrode ◽  
Lanthanum Manganate ◽  
Pure Phase ◽  
Charge Discharge

The structural and electrochemical properties of lanthanum manganate (LaMnO3) powder prepared by the sol-gel method are researched in this article. The powder calcined at 600 °C showed amorphous, and the powder calcined at 700-800 °C showed the pure phase of the LaMnO3. The grains with the size of about 80-120 nm were agglomerating together. Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical properties in alkaline environment. The electrochemical properties calcined at 700 °C showed a specific capacitance of 73 F/g at the current density of 0.5 A/g. The raw materials for preparing the LaMnO3 powder are cheap, and the operation method is simple.

Effect of Synthesis Conditions on Pseudocapacitance Properties of Nitrogen-Doped Porous Carbon Materials

2019 ◽  
Vol 59 ◽  
pp. 112-125
Author(s):  
Volodymyr Boichuk ◽  
Volodymyr Kotsyubynsky ◽  
Andrii Kachmar ◽  
Sergiy Budzulyak ◽  
Ivan Budzulyak ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Galvanostatic Charge ◽  
Discharge Data ◽  
Synthesis Conditions ◽  
Capacitive Properties ◽  
Charge Discharge ◽  
Redox Capacitance

The electrochemical properties of the nitrogen-enriched carbons obtained by plant raw treatment as electrode material for supercapacitors were investigated by electrochemical impedance spectroscopy, cycling voltammetry and galvanostatic charge-discharge cycling in KOH aqueous electrolyte. The effect of activation agent (NaOH) concentration and carbonization temperature were analyzed. The separation of double layer and redox capacitance components was done. The dominating role of microporosity for capacitive properties was demonstrated. The capacitance of model capacitors based on carbons obtained at different modes was calculated from both from cycling voltammetry and galvanostatic charge-discharge data. The maximal values of specific capacitance of carbon materials carbonized at 600°C and 900°C are about 100 and 120 F/g, respectively.

Template Synthesis of Activated Carbon for Supercapacitor

2010 ◽  
Vol 663-665 ◽  
pp. 568-571
Author(s):  
Ren Qing Wang ◽  
Qin Fang ◽  
Mei Gen Deng
Keyword(s):  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Phenolic Resin ◽  
Tween 80 ◽  
Galvanostatic Charge ◽  
N2 Adsorption ◽  
Power Property ◽  
Capacitance Characteristics ◽  
A Current ◽  
Charge Discharge

Activated carbon was fabricated by using phenolic resin as carbon source, tween-80 as organic template, KOH as activator. The samples were analyzed by N2 adsorption, scanning electron microscopy (SEM). Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical performance of the samples. The results showed that specific surface area of the prepared sample was 1935.99 m2/g, pore size was mainly in the range of 1.0～4.0 nm and showed typical capacitance characteristics in cyclic voltammetry. At a current density of 15mA/cm2, a specific capacitance of 246.18F/g was achieved and the resistance was 1.11Ω. Supercapacitors based on the sample had low ESR and excellent power property.

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.

scholarly journals ХАРАКТЕРИЗАЦИЯ УГЛЕРОДНЫХ ЭЛЕКТРОДОВ С НАНОЧАСТИЦАМИ ГИДРОКСИД НИКЕЛЯ ДЛЯ СУПЕРКОНДЕНСАТОРОВ (CHARACTERIZATION OF CARBON ELECTRODES WITH NANOPARTICLES OF NICKEL HYDROXIDE FOR SUPERCONDENSERS)

2020 ◽  
Author(s):  
Shyryn Nurbolat ◽  
Zhanar Kalkozova ◽  
Khabibulla Abdullin
Keyword(s):  
Cyclic Voltammetry ◽  
Nickel Hydroxide ◽  
Polyvinylidene Fluoride ◽  
Carbon Materials ◽  
Specific Capacity ◽  
Carbon Electrodes ◽  
Composite Electrodes ◽  
Galvanostatic Charge ◽  
Highly Dispersed ◽  
Charge Discharge

Composite electrodes for supercapacitors have been obtained, consisting of a matrix of highly dispersed carbon materials: microcrystalline graphite and multi-walled carbon nanotubes, also a filler of nanoparticles of nickel hydroxide. Β-Co (OH) 2 and β-Ni (OH) 2 nanopowders were obtained by chemical deposition from solution. To create the electrodes, a polyvinylidene fluoride polymer in the form of a powder was used as a bonding material. The main technological stages of the manufacture of electrodes were determined, the parameters of the obtained structures were measured by the method of cyclic voltammetry and galvanostatic charge-discharge. For the manufacture of carbon electrodes, the optimal ratios of highly dispersed carbon materials, a binder polymer and a solvent have been determined to create mechanically strong layers with high conductivity and capacity. The technique of creating capacitor structures and measuring the capacitance of the obtained electrochemical capacitors has been worked out. Capacitors made of highly dispersed carbon materials showed typical rectangular curves of cyclic voltammetry and a linear decay-rise of the galvanostatic charge-discharge dependences. Typical values of specific capacity ~ 50 F / g were obtained. Composite electrodes made of nickel hydroxide nanoparticles in a carbon matrix demonstrated an increase in capacitance to ~ 180 F / g. It is shown that composite electrodes are promising for creating capacitors with a high specific capacity.

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