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

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.

Download Full-text

Synthesis and Electrochemical Properties of Nanorod Polyaniline/Activated Carbon Composites for Electrochemical Capacitor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.561 ◽

2009 ◽

Vol 79-82 ◽

pp. 561-564 ◽

Cited By ~ 1

Author(s):

Lan Liu ◽

Wei Wang ◽

Ben Lin He ◽

Ming Liang Sun ◽

Wu Yuan Zou ◽

...

Keyword(s):

Electrochemical Method ◽

Electrochemical Impedance ◽

Electrochemical Capacitor ◽

Carbon Composites ◽

Composite Electrodes ◽

Galvanostatic Charge ◽

Power Characteristics ◽

Pani Composite ◽

Electronic Microscope ◽

Discharge Test

In this study, polyaniline (PANI) was prepared by electrochemical method on the surface of active carbon (AC) electrodes. The physical and electrochemistry properties of AC/PANI composite compared with pure AC electrode were investigated by scanning electronic microscope (SEM), galvanostatic charge/discharge test and electrochemical impedance spectroscopy (EIS). The AC/PANI composite electrodes showed much higher specific capacitance (624 F•g-1), better power characteristics and were more promising for application in capacitor than pure AC electrodes.

Download Full-text

Nitric Acid Activated Carbon Aerogels for Supercapacitors

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.302.158 ◽

2013 ◽

Vol 302 ◽

pp. 158-164 ◽

Cited By ~ 1

Author(s):

Ya Jie Li ◽

Xing Yuan Ni ◽

Jun Shen ◽

Dong Liu ◽

Nian Ping Liu

Keyword(s):

Activated Carbon ◽

Nitric Acid ◽

Electrochemical Impedance ◽

Carbon Aerogels ◽

Electrochemical Performances ◽

Galvanostatic Charge ◽

Sem Images ◽

Resorcinol Formaldehyde ◽

Charge Discharge ◽

Discharge Test

The electrochemical performances of resorcinol–formaldehyde-based carbon aerogels can be significantly enhanced by nitric acid activation.FT-IR spectra and SEM images reveal the constitution and morphology of samples .The electrochemical performances of materials were tested by cyclic voltammetry,galvanostatic charge/discharge test ,electrochemical impedance spectroscopy and cyclic test. The results show that activation does not influence the molecular structure of carbon aerogels,which maintains their nano-porous structure. Activation increases the specific capacitance by 50% and improves the conductivity of carbon aerogels,resulting in fenfect cycling stability. So nitric acid activated carbon aerogels is an ideal electrode material for supercapacitors.

Download Full-text

Ag Doped Co3O4 Nanowire Arrays as an Electrode Material for Electrochemical Capacitors

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.268-270.157 ◽

2012 ◽

Vol 268-270 ◽

pp. 157-163 ◽

Cited By ~ 1

Author(s):

Yang Xu ◽

Ji Chun Huang ◽

Lin Cheng ◽

Dian Xue Cao ◽

Gui Ling Wang

Keyword(s):

Electrochemical Impedance ◽

Nickel Foam ◽

Nanowire Arrays ◽

X Ray Diffraction ◽

X Ray ◽

Growth Method ◽

Template Free ◽

A Current ◽

Charge Discharge ◽

Discharge Test

Co3O4 nanowire arrays freely standing on nickel foam are prepared via a template-free growth method，and it is doped by Ag via electrodeposition method (denoted as NWA-Ag/Co3O4，NWA represents Nanowire Arrays). The morphology of NWA-Ag/Co3O4 is examined by scanning electron microscopy. The phase structure of the NWA-Ag/Co3O4 electrode is characterized by X-ray diffraction spectroscopy. The supercapacitance behavior of the NWA-Ag/Co3O4 electrodes is investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The results show that the nanowire arrays densely cover the nickel foam substrate and have diameters around 250 nm. The NWA-Ag/Co3O4 electrodes exhibit a specific capacitance of 1009 F g−1 at a current density of 5 mA cm-2 in 6.0 mol dm-3 KOH electrolyte. The capacitance loss is less than 6.5% after 500 charge/discharge cycles at 10 mA cm-2 and with columbic efficiency higher than 97.5%.

Download Full-text

Preparation of Co-Ni Mixed Oxide/Graphene Composite and its Electrochemical Performances as Supercapacitor Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.727.775 ◽

2017 ◽

Vol 727 ◽

pp. 775-780 ◽

Cited By ~ 2

Author(s):

Yun Long Zhou ◽

Chen Hao Zhao ◽

Zhi Biao Hu ◽

Xue Yan Huang ◽

Kai Yu Liu ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Mixed Oxides ◽

Electrochemical Performances ◽

X Ray Diffraction ◽

Galvanostatic Charge ◽

X Ray ◽

Graphene Composite ◽

A Current ◽

Charge Discharge ◽

Discharge Test

The Co-Ni mixed oxides/graphene composite has been prepared using the solution based oxidation route. The structures of bare Co-Ni mixed oxides and Co-Ni mixed oxides/graphene composite is clearly studied by X-ray diffraction. The electrochemical properties of Co-Ni mixed oxides/graphene composite are investigated by Cyclic Voltammetry (CV) and galvanostatic charge discharge test. The result shows that, the NiO phase has not been detected in the composite, and the graphene composite delivers a discharge capacity of 353.6 F/g at a current density of 0.32 A g-1.

Download Full-text

Synthesis and Electrochemical Performance of Poly(N-Acetylaniline)/Carbon Nanotubes Composite for Supercapacitors

Materials Science Forum ◽

10.4028/www.scientific.net/msf.694.315 ◽

2011 ◽

Vol 694 ◽

pp. 315-318

Author(s):

Jing Li ◽

Hua Qing Xie ◽

Yang Li ◽

Ji Fen Wang

Keyword(s):

Carbon Nanotubes ◽

Electrochemical Method ◽

Cycle Stability ◽

Galvanostatic Charge ◽

Maximum Capacity ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

A Current ◽

Charge Discharge ◽

Scanning Electron

Poly(N-acetylaniline)/multi-walled carbon nanotubes composite (PAANI/MWCNTs) are synthesized using electrochemical method. The morphology of the composite is examined by scanning electron microscopy. Electrochemical properties are characterized by cyclic voltammetry and galvanostatic charge/discharge. A remarkable specific capacitance of 690 F g-1 is obtained at a current density of 2.5 A g-1, compared to 225 F g-1 for pure PAANI and 90 F g-1 for MWCNTs. The composite presents excellent cycle stability, losing 15% of the maximum capacity after 1000 cycles.

Download Full-text

Nanofiber NiMoO4/g-C3N4 Composite Electrode Materials for Redox Supercapacitor Applications

Nanomaterials ◽

10.3390/nano10020392 ◽

2020 ◽

Vol 10 (2) ◽

pp. 392 ◽

Cited By ~ 9

Author(s):

Kannadasan Thiagarajan ◽

Thirugnanam Bavani ◽

Prabhakarn Arunachalam ◽

Seung Jun Lee ◽

Jayaraman Theerthagiri ◽

...

Keyword(s):

Electron Microscopy ◽

Electrode Material ◽

Composite Electrode ◽

Electrode Materials ◽

Electrochemical Impedance ◽

Galvanostatic Charge ◽

Transmission Electron ◽

Cd Studies ◽

Supercapacitor Applications ◽

Charge Discharge

NiMoO4/g-C3N4 was fabricated by a hydrothermal method and used as an electrode material in a supercapacitor. The samples were characterized by XRD, FTIR, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to study the physical and structural properties of the as-prepared NiMoO4/g-C3N4 material. The electrochemical responses of pristine NiMoO4 and the NiMoO4/g-C3N4 nanocomposite material were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). From the CD studies, the NiMoO4/g-C3N4 nanocomposite revealed a higher maximum specific capacitance (510 Fg−1) in comparison to pristine NiMoO4 (203 Fg−1). In addition, the NiMoO4/g-C3N4 composite electrode material exhibited high stability, which maintained up to 91.8% capacity even after 2000 charge-discharge cycles. Finally, NiMoO4/g-C3N4 was found to exhibit an energy density value of 11.3 Whkg−1. These findings clearly suggested that NiMoO4/g-C3N4 could be a suitable electrode material for electrochemical capacitors.

Download Full-text

Hydrothermal Synthesis and Electrochemical Performance of LiFePO4/Graphene Composites for Lithium-Ion Batteries

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.900.242 ◽

2014 ◽

Vol 900 ◽

pp. 242-246 ◽

Cited By ~ 1

Author(s):

Xing Ling Lei ◽

Hai Yan Zhang ◽

Yi Ming Chen ◽

Wen Guang Wang ◽

Zi Dong Huang ◽

...

Keyword(s):

Electron Microscopy ◽

Lithium Ion Batteries ◽

Electrochemical Impedance ◽

Lithium Ion ◽

X Ray Diffraction ◽

Galvanostatic Charge ◽

X Ray ◽

Charge Discharge ◽

Scanning Electron ◽

Discharge Test

LiFePO4/graphene composites were prepared via a simple hydrothermal method. The as-prepared LiFePO4/graphene composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. The lithium-ion batteries using LiFePO4/graphene composites as cathode material exhibited a discharge capacity of 165 mAh/g, which was 97% of the theoretical capacity of 170 mAh/g.

Download Full-text

Square-wave voltammetric determination of rutin in pharmaceutical formulations using a carbon composite electrode modified with copper (II) phosphate immobilized in polyester resin

Brazilian Journal of Pharmaceutical Sciences ◽

10.1590/s1984-82502012000400007 ◽

2012 ◽

Vol 48 (4) ◽

pp. 639-649 ◽

Cited By ~ 9

Author(s):

Kellen Heloizy Garcia Freitas ◽

Orlando Fatibello-Filho ◽

Ivanildo Luiz de Mattos

Keyword(s):

Modified Electrode ◽

Composite Electrode ◽

Polyester Resin ◽

Pharmaceutical Formulations ◽

Carbon Composite ◽

X Ray ◽

Square Wave ◽

Wave Voltammetry ◽

Carbon Composite Electrode

A carbon composite electrode modified with copper (II) phosphate immobilized in a polyester resin (Cu3(PO4)2-Poly) for the determination of rutin in pharmaceutical samples by square-wave voltammetry is described herein. The modified electrode allows the determination of rutin at a potential (0.20 V vs. Ag/AgCl (3.0 mol L-1 KCl)) lower than that observed at an unmodified electrode. The peak current was found to be linear to the rutin concentration in the range from 9.9 × 10-8 to 2.5 × 10-6 mol L-1, with a detection limit of 1.2×10-8 mol L-1. The response of the electrode was stable, with no variation in baseline levels within several hours of continuous operation. The surface morphology of the modified electrode was characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) system. The results obtained are precise and accurate. In addition, these results are in agreement with those obtained by the chromatographic method at a 95% confidence level.

Download Full-text