Influence of chemical modification of activated carbon surface on characteristics of supercapacitors

Bakhmatyuk, B. P.; Venhryn, B.Ya.; Grygorchak, I. I.; Micov, Miroslav

doi:10.1016/j.jpowsour.2008.02.045

Cited by 25 publications

(11 citation statements)

References 15 publications

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“…For example, some researchers have applied small-amplitude techniques such as impedance spectroscopy [57][58][59][60][61][62][63][64][65][66][67][68][69][70], while others have applied large-amplitude techniques such as cyclic voltammetry [71][72][73][74][75][76][77]. A few pioneers have even performed computer simulations [78][79][80][81][82][83][84][85][86][87][88][89][90].…”

Section: Introductionmentioning

confidence: 99%

A universal equivalent circuit for carbon-based supercapacitors

Fletcher

Black

Kirkpatrick

2013

J Solid State Electrochem

137

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A universal equivalent circuit is proposed for carbon-based supercapacitors. The circuit, which actually applies to all porous electrodes having non-branching pores, consists of a single vertical ladder network in series with an RC parallel network. This elegant arrangement explains the three most important shortcomings of present-day supercapacitors, namely open circuit voltage decay, capacitance loss at high frequency, and voltammetric distortion at high scan rate. It also explains the shape of the complex plane impedance plots of commercial devices and reveals why the equivalent series capacitance increases with temperature. Finally, the construction of a solid-state supercapacitor simulator is described. This device is based on a truncated version of the universal equivalent circuit, and it allows experimenters to explore the responses of different supercapacitor designs without having to modify real supercapacitors.

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Section: Introductionmentioning

confidence: 99%

A universal equivalent circuit for carbon-based supercapacitors

Fletcher

Black

Kirkpatrick

2013

J Solid State Electrochem

137

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“…У роботі [8] було вивчено вплив структури активованого кісточкового вугілля на електрохімічні властивості ПЕШ у водних розчинах та були отримані високі питомі енергетичні характеристики дослідженого матеріалу в системі прототипу гібридного ЕК. Експериментально встановлено [9], що одним із оптимальних способів отримання вуглецевого електродного матеріалу є карбонізація вихідної сировини рослинного походження у закритій печі в інтервалі температур 320…520 ºС і наступна активація гідроксидом калію при температурі 850…920 ºС, що дало змогу отримати вуглецевий матеріал з величиною питомої ємності 150…195 Ф/г при величині розрядного струму 50 мА.…”

Section: вступunclassified

Electric Stimulation of Charge-Discharge Processes of Electrochemical Capacitors

Budzulyak

Rachiy

Vashchynsky

et al. 2015

PCSS

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The research is devoted to study the impact of charge-discharge processes in electrochemical capacitors. Nanoporous carbon material was used like electrode material , which was gotten through carbonization of raw plant material. The supercapacitor model and main mode parameters of operation were chosen for this experiment. Experimental data were gotten, where we make the conclusion, that the long-term processing of electric stimulation enhances capacity properties of electrochemical capacitors.

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“…From the inserted plots, it is found that the chargetransfer resistance of the cell assembled by CNTs/PPy/CNTs/MF is smaller than that assembled by PPy/CNTs/MF, which is an important factor in the electrochemical capacitor. 38 This also indicates that the out layer of CNTs in CNTs/PPy/CNTs/MF has improved the conductivity and makes the composite having better electrochemical capacity compared with PPy/CNTs/MF. The cyclic stability of the cells is one of the important factors for their practical application.…”

Section: Capacitive Properties Of the Cells Assembled By Ppy/cnts/ Mfmentioning

confidence: 99%

Fabrication of carbon nanotubes/polypyrrole/carbon nanotubes/melamine foam for supercapacitor

Liu

Han

Chang

et al. 2013

J of Applied Polymer Sci

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The carbon nanotubes (CNTs) have been loaded on the melamine foam (MF) to form the composite (CNTs/MF) by dip‐dry process, then polypyrrole (PPy) is coated on CNTs/MF (PPy/CNTs/MF) through chemical oxidation polymerization by using FeCl3·6H2O adsorbed on CNTs/MF as oxidant to polymerize the pyrrole vapor. Finally, CNTs are coated on the surface of PPy/CNTs/MF to increase the conductivity of the composite (CNTs/PPy/CNTs/MF) by dip‐dry process again. The composites have been characterized by X‐ray diffraction spectroscopy, scanning electron microscopy and electrochemical method. The results show that the structure of the composites has obvious influence on their capacitive properties. According to the galvanostatic charge/discharge test, the specific capacitance of CNTs/PPy/CNTs/MF is about 184 F g−1 based on the total mass of the composite and 262 F g−1 based on the mass of PPy (70.2 wt % in the composite) at the current density of 0.4 A g−1, which is higher than that of PPy/CNTs/MF (120 F g−1 based on the total mass of the composite and 167 F g−1 based on the mass of the PPy). Furthermore, the capacitor assembled by CNTs/PPy/CNTs/MF shows excellent cyclic stability. The capacitance of the cell assembled by CNTs/PPy/CNTs/MF retains 96.3% over 450 scan cycles at scan rate of 20 mV s−1, which is larger than that assembled by CNTs/PPy/MF (72.5%). © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39779.

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Influence of chemical modification of activated carbon surface on characteristics of supercapacitors

Cited by 25 publications

References 15 publications

A universal equivalent circuit for carbon-based supercapacitors

A universal equivalent circuit for carbon-based supercapacitors

Electric Stimulation of Charge-Discharge Processes of Electrochemical Capacitors

Fabrication of carbon nanotubes/polypyrrole/carbon nanotubes/melamine foam for supercapacitor

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