Theoretical and experimental specific capacitance of polyaniline in sulfuric acid

Li, Hanlu; Wang, Jixiao; Chu, Qingxian; Wang, Zhi; Zhang, Fengbao; Wang, Shichang

doi:10.1016/j.jpowsour.2009.01.052

Cited by 566 publications

(335 citation statements)

References 55 publications

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“…This represents the diffusion of ions to the interface between electrode and electrolyte. At these low frequencies, the current flowing through the cell usually has resistance and a Warburg impedance characteristic element denoted by W, which is expressed as [33,34] where A is the Warburg coefficient and ω is the angular frequency.…”

Section: Electrochemical Testingmentioning

confidence: 99%

“…Figure 6 shows the Nyquist plot in the frequency range of 100 kHz to 10 mHz resistive element R L is associated with CPE L . The impedance of CPE DL is defined as [34] where T and n are frequency-independent constants and ω is the angular frequency. The exponent n is a correction factor which is related to the capacitive kinetics and roughness of electrode surfaces.…”

Section: Electrochemical Testingmentioning

confidence: 99%

“…The exponent n is a correction factor which is related to the capacitive kinetics and roughness of electrode surfaces. The values for n range between 0 and 1; n = 1 denotes that the CPE is an ideal capacitor, for n = -1, CPE behaves as an inductor, while n = 0 and 0.5 denote a resistance and Warburg behavior respectively [34]. Table 1 for a single electrode in series.…”

Section: Electrochemical Testingmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Barzegar

Bello

Fashedemi

et al. 2015

Electrochimica Acta

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A scalable production of high surface area nanoporous carbon material (~ 2994 m 2 g -1 ) with good distribution of micro-, meso-and macro-pores was hydrothermally synthesized using both cheap polymers and graphene foam as carbon sources. The as synthesised material shows a unique interconnected porous graphitic structure. The electrochemical double-layer capacitor fabricated from this nanoporous carbon material exhibited a superior supercapacitive performance of 188 F g -1 at current density 0.5 A g -1 . This corresponded to areal capacitance of 6.3 µF cm -2 coupled with a high energy of 0.56 µWh cm -2 (16.71 Wh kg -1 ) and a power density of 13.39 µW cm -2 (401 W kg -1 ) due to extended potential window of 1.6 V in KOH aqueous electrolyte. Moreover, no capacitance loss after 10,000 cycles was observed, owing to the 2 unique structure and large surface area of the active material. The outstanding performance of this material as supercapacitor electrode shows that it has great potential for high performance energy-related applications.

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Section: Electrochemical Testingmentioning

confidence: 99%

Section: Electrochemical Testingmentioning

confidence: 99%

Section: Electrochemical Testingmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Barzegar

Bello

Fashedemi

et al. 2015

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…A constant phase element (CPE) defined by Eq. S4 [50] is employed in the equivalent circuit considering the deviation from the ideal capacitor behavior. Without the magnetic field, the composite electrode in Fig.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Significantly enhanced energy density of magnetite/polypyrrole nanocomposite capacitors at high rates by low magnetic fields

Wei

Guo

et al. 2017

Adv Compos Hybrid Mater

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One great challenge existing in electrochemical capacitors (ECs) is to achieve high energy densities at high rates. Currently, most research efforts are focused on development of new electrode materials or modification of the microstructure of traditional electrode materials. Herein, we propose a new strategy for significant enhancement of the energy density of ECs at high rates, in which an external magnetic field is exerted. Results indicate that exertion of a magnetic field can increase the energy density of nanocomposite capacitors significantly. In particular, the energy densities of the magnetite/ polypyrrole nanocomposite capacitors containing different content magnetite nanoparticles achieve an increase of more than 10 times at a high current density of 10 A/g, compared to the counterparts without a magnetic field. The possible mechanism is that the magnetic field induces electrolyte ion movement enhancement and charge transfer resistance reduction, which remarkably cause the increase of capacitance and energy density. This work provides an innovative strategy to significantly enhance the rate capabilities of current ECs by a simple physical process rather than chemical process.

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“…Among them, conducting polymers are one of the most studied due to their characteristics, such as high electrical conductivity, electrochemical reversibility, low weight, and stability in the air [2][3][4][5][6][7] . Particularly, cconducting polymers such as polyaniline (PAni) [9,10] , polypyrrole [11,12] , poly(ethylenedioxythiophene) polythiophene [4] have appeared as the most cited in literature. In this context, PAni is a very promising candidate for practical applications due to its reversible control of electrical properties by both charge-transfer doping and protonation, good processability, environmental stability, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Influence of the polymeric coating thickness on the electrochemical performance of Carbon Fiber/PAni composites

et al. 2015

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SbstractCarbon fiber/polyaniline composites (CF/PAni) were synthesized at three different deposition time of 30, 60 and 90 min by oxidative polymerization. The composite materials were morphologically and physically characterized by scanning electron microscopy and by Raman spectroscopy, respectively. Their electrochemical responses were analyzed by cyclic voltammetry, by galvanostatic test, and by electrochemical impedance spectroscopy. The influence of the PAni layer thickness deposited on carbon fibers for the composite formation as well as for their electrochemical properties was discussed. The CF/PAni-30 showed a nanometric thickness with more homogeneous morphology compared to those formed in deposition times of 60 and 90 min. It also showed, from the electrochemical impedance spectroscopy measurements, the lowest charge transfer resistance value associated to the its highest value for the double-layer capacitance of 180 Fg -1 making it a very strong candidate as a supercapacitor electrode.

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Theoretical and experimental specific capacitance of polyaniline in sulfuric acid

Cited by 566 publications

References 55 publications

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Synthesis of 3D porous carbon based on cheap polymers and graphene foam for high-performance electrochemical capacitors

Significantly enhanced energy density of magnetite/polypyrrole nanocomposite capacitors at high rates by low magnetic fields

Influence of the polymeric coating thickness on the electrochemical performance of Carbon Fiber/PAni composites

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