All solid supercapacitor based on activated carbon and poly [2,5-benzimidazole] for high temperature application

Hastak, R. S.; Sivaraman, P.; Potphode, Darshna; Shashidhara, K.; Samui, A. B.

doi:10.1016/j.electacta.2011.10.102

Cited by 106 publications

(71 citation statements)

References 28 publications

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“…For example, in a particular study at a current density of 0.1 A g −1 , energy density increased by 19 % at 40°C and decreased by 32 % at −20°C, as compared to room temperature [40]. The high-temperature performance of supercapacitors based on activated carbon and MWCNT electrodes separately with the proton-conducting polymer electrolyte phosphoric acid doped poly [2,5 benzimidazole] (ABPBI) has been characterized over a wide temperature range of 27-120°C [1,41]. The specific capacitance of supercapacitors having different compositions increased linearly with temperature.…”

Section: Water-containing Polymer Electrolytesmentioning

confidence: 98%

Influence of Temperature on Supercapacitor Performance

Xiong

Kundu

Fisher

2015

Thermal Effects in Supercapacitors

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Because of the negligible faradic reactions in double-layer capacitors, heat generated during charge/discharge processes derives mostly from Joule heating, which is determined by internal resistance (or equivalent series resistance, ESR). However, heat generated in pseudo-capacitors derives from both Joule heating and exothermic/ endothermic Faradic reactions. Thus, understanding how temperature affects capacitance and ESR is essential to predict supercapacitor performance under different operating conditions. The general techniques (e.g., CV, constant current-charge/ discharge and EIS) to evaluate capacitance and ESR have been discussed in Sect. 2.4.Many factors contribute to ESR in a supercapacitor: (i) interfacial resistance (contact resistance) between the electrode and the current collectors; (ii) electronic resistance of the electrode material; (iii) resistance of ions migrating through the electrode pores; (v) electrolyte resistance, and (vi) resistance of ions migrating through the separator [2,3]. Consequently, ESR depends on the active area and porosity of electrodes, ionic conductivity of the electrolyte, and physical properties of the separator (e.g., porosity, thickness and tortuosity). Notably, electrolyte resistance is only part of ESR. ESR depends on many factors (e.g., electrode structure, materials, electrolytes, fabrication and temperature). ESR is suggested to be inversely proportional to σ within certain ranges [4], but this relation can be violated. For instance, ESR is more dominated by the carbon electrode resistance and the interface resistance at the current collector than electrolyte resistance, as indicated by a much smaller activation energy of ACN-based supercapacitors than that of the electrolyte [5]. Capacitance is a function of surface area and volume of the electrodes, and ionic conductivity of electrolytes, which strongly depends on temperature variations.The operating temperature strongly influences the properties of electrolytes (e.g., viscosity, solubility of the salt in solvents, ionic conductivity, and thermal stability), leading to dramatic changes of capacitance and ESR, particularly at extreme temperatures (ultra-low and ultra-high temperatures). Consequently, the influence of

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Section: Water-containing Polymer Electrolytesmentioning

confidence: 98%

Influence of Temperature on Supercapacitor Performance

Xiong

Kundu

Fisher

2015

Thermal Effects in Supercapacitors

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“…The electrochemical performance after cooling from 100 to 25°C was better than that before the heating at 25°C, indicating that the surface modification of the electrodes was stable after repeated heating and cooling testing conditions. Improved performance at room temperature after annealing of electrolytes has also been observed with ionic liquid electrolyte and activated carbon electrodes at an annealing temperature of 100°C [38]. Another reason for the increased capacitance might be the enhanced migration of ions into the innermost pores of electrodes at elevated temperatures.…”

Section: Thermal Stability Of Organic Electrolytesmentioning

confidence: 87%

Influence of Temperature on Supercapacitor Components

Xiong

Kundu

Fisher

2015

Thermal Effects in Supercapacitors

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Among the major thermophysical properties of electrolytes, thermal stability and ionic conductivity are the most two crucial properties in determining the thermal performance of supercapacitors. The former determines the usable temperature range of supercapacitor devices, and the latter dictates the electrochemical performance at different temperatures. This section generally introduces the relationships among the critical thermophysical properties of electrolytes, followed by a discussion of the thermal stability and ionic conductivity of different common electrolytes.

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“…The intercept of the x-axis of the Nyquist plot at the high frequency end represents the solution resistance (R s ) as illustrated in Fig. 6 [10]. It can be observed from the inset illustration that the R s is at *0.6 ohm for rGO and *0.5 ohm for 1-PB-rGO.…”

Section: Electrochemical Studiesmentioning

confidence: 95%

“…The last part is the vertical line observed after the semi-circular arch. The slope for rGO and 1-PB-rGO is recorded to be *83°and *82°which shows that the supercapacitor functions closely to an ideal capacitor [10].…”

Section: Electrochemical Studiesmentioning

confidence: 99%

1-Pyrenebutyric Acid Functionalized Reduced Graphene Oxide (1-Pb-Rgo) Energy Storage

Yusoff

Chong

2015

Icgsce 2014

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Supercapacitors are a class of energy storage device which has high energy density and high power density. As a material with unique 2D structure as well as outstanding physical properties such as high electrical conductivity and large surface area, graphene demonstrates great potential to be the electrode material for supercapacitors. Despite graphene showing theoretical surface area as high as 2630 m 2 /g, results acquired showed that not all the surface area were utilized. This could be due to the tendency of the graphene layers to restack. In this work, 1-pyrenebutyric acid (1-PB) was anchored to graphene with the pyrenyl group via π-π stacking to prevent the restacking of graphene layers. The successful functionalization of 1-PB on the hydrophobic surface of rGO was characterized with UV-Vis Spectroscopy and Fourier Transformed Infrared Spectroscopy (FTIR). The electrochemical performance of 1-PB-rGO was studied through cyclic voltammetry (CV), galvanostatic charge-discharge (CD) and electrochemical impedance spectroscopy (EIS). Using 6 M KOH as the electrolyte, we obtained an enhanced specific capacitance for 1-PB-rGO. These findings indicates that the noncovalent functionalization of 1-PB on rGO enhances the capacitive storage ability and it show potential as an electrode material in the energy storage application.

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All solid supercapacitor based on activated carbon and poly [2,5-benzimidazole] for high temperature application

Cited by 106 publications

References 28 publications

Influence of Temperature on Supercapacitor Performance

Influence of Temperature on Supercapacitor Performance

Influence of Temperature on Supercapacitor Components

1-Pyrenebutyric Acid Functionalized Reduced Graphene Oxide (1-Pb-Rgo) Energy Storage

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