Electrochemical Capacitance Properties of Electrode Based on Polyaniline Coated Graphite Nanoplatelets/Polystyrene Composite Film

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Tanveer ul Haq Zia ◽  
Ahmad Nawaz Khan ◽  
Behisht Ara ◽  
Kashif Gul
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
Specific Power ◽  
Graphite Nanoplatelets ◽  
Polystyrene Matrix ◽  
A Current ◽  
In Situ Emulsion Polymerization ◽  
Charge Discharge

Abstract The electrochemical behavior of the electrode material based on composites of polyaniline (PANI), graphite nanoplatelets (GnP), and polystyrene (PS) matrix was evaluated by applying cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS), for its application in electrochemical supercapacitor which is an advanced energy storing device. Composites were prepared by coating polyaniline on graphite nanoplatelets (PANI/GnP) via in situ emulsion polymerization, exhibiting specific surface area of 178.75 m2/g as compared with 72.1 m2/g of pristine GnP. The PANI/GnP was then embedded in polystyrene matrix (PANI/GnP/PS), which showed improved electrical conductivity due to an interconnected mesh of PANI/GnP as confirmed by scanning electron microscopy (SEM) morphological analysis. The formation of porous conductive network in PANI/GnP/PS with conductivity value of 8.6 × 10−3 S/cm resulted in high specific capacitance of 411.3 F/g measured at a current density of 0.5 A/g which corresponded to specific energy of 47.94 Wh/kg and specific power of 281.94 W/kg, as well as the decrease in specific capacitance was 32% even after 1600 charge–discharge cycles showing good rate performance which renders it an ideal material for electrodes in supercapacitors.

Effects of Deposition Temperatures on the Nanoflakes Co(OH)2 Porous Films for Supercapacitors

2011 ◽  
Vol 694 ◽  
pp. 214-218
Author(s):  
Zhan Jun Yu ◽  
Bin Bin Wang ◽  
Rong Bao Liao ◽  
Yu Min Cui
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
High Specific Capacitance ◽  
Electrochemical Technique ◽  
Porous Films ◽  
Discharge Current Density ◽  
A Charge ◽  
Maximum Specific Capacitance ◽  
Charge Discharge

Nanoflakes Co(OH)2 porous films were successfully synthesized by a facile electrochemical technique. The morphology was characterized by field emission scanning electron microscopy (FESEM). Electrochemical techniques such as cyclic voltammetry (CV), galvanostaitc charge/discharge and electrochemical impedance spectroscopy were used to study the effects of deposition temperatures on the capacitance of the films. The results exhibited that the Co(OH)2 films single electrode had high specific capacitance in KOH electrolyte. A maximum specific capacitance of 2780 F/g could be achieved for the Co(OH)2 film deposited at 50°C in 2 M aqueous KOH with 0 to 0.4V potential at a charge-discharge current density of 4 mA/cm2. Therefore, the obtained nanoflakes Co(OH)2 porous films can be a potential application electrode material for supercapacitors.

Synthesis and Characterization of Nanoflakes β-Ni(OH)2 Microspheres for Supercapacitors

2011 ◽  
Vol 230-232 ◽  
pp. 306-309 ◽  
Author(s):  
Zhan Jun Yu ◽  
Ying Dai ◽  
Wen Chen
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Impedance ◽  
High Specific Capacitance ◽  
X Ray Diffraction ◽  
Discharge Current Density ◽  
X Ray ◽  
A Charge ◽  
Maximum Specific Capacitance ◽  
Charge Discharge

Nanoflakes β-Ni(OH)2microspheres were successfully synthesized by a facile hydrothermal. The microstructures and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical properties studies were carried out using cyclic voltammetry (CV), galvanostaitc charge/discharge and electrochemical impedance spectroscopy methods, respectively. The results exhibited that the β-Ni(OH)2single electrode had high specific capacitance in KOH electrolyte. A maximum specific capacitance of 1929 F/g could be achieved in 6 M aqueous KOH with 0 to 0.4 V potential at a charge-discharge current density of 6 mA/cm2. Therefore, the obtained nanoflakes β-Ni(OH)2microspheres can be a potential application electrode material for supercapacitors.

scholarly journals Fabrication of Hierarchical NiMoO4/NiMoO4 Nanoflowers on Highly Conductive Flexible Nickel Foam Substrate as a Capacitive Electrode Material for Supercapacitors with Enhanced Electrochemical Performance

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1143 ◽  
Author(s):  
Anil Yedluri ◽  
Tarugu Anitha ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.

A novel synthesis of ultra thin graphene sheets for energy storage applications using malonic acid as a reducing agent

2014 ◽  
Vol 2 (47) ◽  
pp. 20345-20357 ◽  
Author(s):  
Anil Kumar ◽  
Mahima Khandelwal
Keyword(s):  
Energy Storage ◽  
Potential Energy ◽  
Specific Capacitance ◽  
Malonic Acid ◽  
High Specific Capacitance ◽  
Reducing Agent ◽  
Graphene Sheets ◽  
Novel Synthesis ◽  
Energy Storage Applications ◽  
Charge Discharge

Novel ultrathin graphene sheets (0.41 ± 0.03 nm) with increased sp2 character, high specific capacitance and charge–discharge capability have been synthesized and demonstrated to have potential energy storage applications.

Ferrous Nitrate–Nickel Oxide (Fe(NO3)2–NiO) Nanospheres Incorporated With Carbon Black and Polyvinylidenefluoride for Supercapacitor Applications

2019 ◽  
Vol 16 (3) ◽  
Author(s):  
Aqib Muzaffar ◽  
Keerthana Muthusamy ◽  
M. Basheer Ahamed
Keyword(s):  
Nickel Oxide ◽  
Specific Capacitance ◽  
Double Layer ◽  
Electrochemical Impedance ◽  
Maximum Efficiency ◽  
Potential Range ◽  
Double Layer Capacitance ◽  
Hydrothermal Route ◽  
Sem Images ◽  
Charge Discharge

Ferrous nitrate/nickel oxide {Fe(NO3)2–NiO} nanocomposite was synthesized via two-step facile hydrothermal route. The nanocomposite exhibits crystalline structure as unveiled by X-ray diffraction (XRD) pattern, while as the scanning electron microscope (SEM) images divulge spherical morphologies for both Fe(NO3)2 as well as NiO nanoparticles differentiating from each other in size. Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques were used to investigate supercapacitive behavior of the symmetrically fabricated nanocomposite electrode configuration using aqueous KOH as the electrolyte. The CV analyses demonstrate dominant electrical double layer capacitance (EDLC) behavior in the potential range of 0–1 V. From charge–discharge curves, the maximum specific capacitance calculated was 460 F g−1 corresponding to the energy density of 16 W h kg−1 at a high power density of 250 W kg−1. EIS data affiliate well with the CV and GCD results justifying the maximum contribution of specific capacitance due to double layer capacitance. The nanocomposite retained 84% of its original capacitance after 1000 cycles and yielded maximum efficiency of 78%.

scholarly journals High Specific Capacitance of the Electrodeposited MnO2 on Porous Foam Nickel Soaked in Alcohol and its Dependence on Precursor Concentration

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 181 ◽  
Author(s):  
Ming Zhang ◽  
Xiaoli Dai ◽  
Cuixian Zhang ◽  
Yuanwu Fuan ◽  
Dingyu Yang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Specific Capacitance ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Retention Rate ◽  
Nickel Foam ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Manganese Acetate ◽  
Mixed Solution

In this work, we used the mixed solution of manganese acetate and sodium sulfate to deposit manganese dioxide on the three-dimensional porous nickel foam that was previously soaked in alcohol, and then the effects of solution concentrations on their capacitance properties were investigated. The surface morphology, microstructure, elemental valence and other information of the material were observed by scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), etc. The electrochemical properties of the material were tested by Galvanostatic charge-discharge (GCD), Cyclic Voltammetry (CV), Chronoamperometry (CA), Electrochemical impedance spectroscopy (EIS), etc. The MnO2 electrode prepared at lower concentrations can respectively reach a specific capacitance of 529.5 F g−1 and 237.3 F g−1 at the current density of 1 A g−1 and 10 A g−1, and after 2000 cycles, the capacity retention rate was still 79.8% of the initial capacitance, and the energy density can even reach 59.4 Wh Kg−1, while at the same time, it also has a lower electrochemical impedance (Rs = 1.18 Ω, Rct = 0.84 Ω).

Hierarchical Dendritic Polypyrrole with High Specific Capacitance for High-performance Supercapacitor Electrode Materials

2017 ◽  
Vol 20 (4) ◽  
pp. 197-204
Author(s):  
Weiliang Chen ◽  
Shuhua Pang ◽  
Zheng Liu ◽  
Zhewei Yang ◽  
Xin Fan ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Chemical Oxidation ◽  
Channel Structure ◽  
Supercapacitor Electrode ◽  
Infrared Spectrometer ◽  
A Current

Polypyrrole with hierarchical dendritic structures assembled with cauliflower-like structure of nanospheres, was synthesized by chemical oxidation polymerization. The structure of polyryrrole was characterized by Fourier transform infrared spectrometer and scanning electron microscopy. The electrochemical performance was performed on CHI660 electrochemical workstation. The results show that oxalic acid has a significant effect on morphology of PPy products. The hierarchical dendritic PPyOA(3) electrodes possess a large specific capacitance as high as 744 F/g at a current density of 0.2 A/g and could achieve a higher specific capacitance of 362 F/g even at a current density of 5.0 A/g. Moreover, the dendritic PPy products produce a large surface area on the electrode through the formation of the channel structure with their assembled cauliflower-like morphology, which facilitates the charge/electron transfer relative to the spherical PPy electrode. The spherical dendritic PPyOA(3) electrode has 58% retention of initial specific capacitance after 260 cycles. The as-prepared dendritic polypyrrole with high performance is a promsing electrode material for supercapacitor.

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.

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