High-Performance Supercapacitors Based on Poly(ionic liquid)-Modified Graphene Electrodes

Kim, Tae Young; Lee, Hyun‐Wook; Stoller, Meryl D.; Dreyer, Daniel R.; Bielawski, Christopher W.; Ruoff, Rodney S.; Suh, Kwang S.

doi:10.1021/nn101968p

Cited by 685 publications

(446 citation statements)

References 33 publications

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“…Note that Equation 34 gives the expressions for the capacitances C s,di f f and C s,int of one electrode and not those of the entire EDLC device. The galvanostatic cycling method consists of charging and discharging the EDLC at constant current ± j s [Equation 27] while measuring the cell or device potential ψ s (t).…”

Section: Journal Of the Electrochemical Society 162 (5) A5158-a5178 mentioning

confidence: 99%

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Pilon

Wang

d’Entremont

2015

J. Electrochem. Soc.

117

105

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This paper reviews recent advances in physical modeling of interfacial and transport phenomena in electric double layer capacitors (EDLCs) under both equilibrium and dynamic cycling. The models are based on continuum theory and account for (i) the Stern layer at the electrode/electrolyte interface, (ii) finite ion sizes, (iii) steric repulsions, (iv) asymmetric electrolytes featuring ions with different valencies, effective diameters, or diffusion coefficients, (v) electric-field-dependent dielectric permittivity of the electrolyte, and/or (vi) porous three-dimensional morphology of the electrodes. Typical characterization methods such as electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic cycling were reproduced numerically to identify the dominant physical phenomena and to gain insight into experimental observations. In addition, recent thermal models derived from first principles for EDLCs under constant-current cycling accounting for irreversible Joule heating and reversible heat generation rates due to ion diffusion, steric effects, and changes in entropy are discussed. Scaling analyses of both equilibrium and dynamic models are also presented as a way to identify self-similar and asymptotic behaviors as well as to develop design rules for electrodes and electrolytes of next generation EDLCs. Electrical double layer capacitors (EDLCs) store energy by ion adsorption in the electrical double layer (EDL) forming at the electrode/electrolyte interfaces.1,2 This process is highly reversible and the cycle life of EDLCs exceeds 100,000 cycles.2,3 EDLCs can operate in a wide range of specific energy and power densities. This versatility is a key feature for electrical energy storage, energy harvesting, and energy regeneration applications. 2The performance of EDLCs is determined by the combination of the electrode material and morphology and of the electrolyte. In general, the key attributes of a good electrode include 1,3-7 (i) large surface area accessible to ions to maximize charge storage, (ii) optimum pore size, short pore length, and good pore connectivity to facilitate ion transport, (iii) large electrical conductivity to enable fast charging and discharging and low ohmic resistance, (iv) thin electrodes and current collectors to reduce the total resistance of the device, (v) small leakage current, (vi) small self-discharge, (vii) environmentally friendly materials, and (viii) low price. However, satisfying all these criteria simultaneously is challenging. For example, increasing surface area often results in larger electrode electrical resistivity.1 Micropores with diameter less than 2 nm contribute greatly to EDLCs capacitance.2 But pores smaller than the ion size are typically inactive and do not contribute to charge storage. 1,8 Porous electrodes must also be electrochemically accessible to ions. Then, interconnected mesopores with diameter ranging from 2 to 50 nm are necessary for fast charging thanks to their easier accessibility to ions. 1,6,[9][10][11] In practice, electrode...

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Section: Journal Of the Electrochemical Society 162 (5) A5158-a5178 mentioning

confidence: 99%

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Pilon

Wang

d’Entremont

2015

J. Electrochem. Soc.

117

105

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“…Supercapacitors have been considered most promising materials for alternative energy sources in the different device and electronics applications due to their rapid charging-discharging rates, high power density and long cycle life (>100 000 cycles) [1][2][3]. Thus, they have been taken as more important components for all electric cars and cars based on fuel cells like hydrogen fuel cell and direct methanol fuel cell (DMFC) in the modern generation [4,5]. In general, supercapacitors have been greatly used as complementary devices to different fuel cells and batteries due to their high energy densities but unable to supply a high power during short time period.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline integrated carbon nanohorn: A superior electrode materials for advanced energy storage

Maiti¹,

Khatua²

2014

Express Polym. Lett.

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Abstract. Fiber-like polyaniline (PANI)/carbon nanohorn (CNH) composites (PACN composites) were prepared as electrode materials for supercapacitor by simple method that involves in-situ polymerization of aniline in the presence of CNH in acidic (HCl) medium with noteworthy electrochemical performances. Thus, the prepared PACN composites show high specific capacitance value of ! 834 F/g at 5 mV/s scan rate compared to ! 231 F/g for pure PANI and CNH (! 145 F/g) at same scan rate of 5 mV/s. CNHs are homogeneously dispersed throughout the matrix and coated successfully. Thus, it provides more active sites for nucleation and electron transfer path. In addition, the composites show high electrical conductivity in the order of ! 6.7·10 -2 S·cm -1 which indicates the formation of continuous interconnected conducting network path in the PACN composites. Morphological study of the PACN composites was carried out by high resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM).

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“…More recently, the development of supercapacitors device has been concentrated on graphene due to its theoretical high surface area (2630 m 2 g -1 ), high electrical conductivity, chemical stability and excellent mechanical properties [14][15][16][17][18][19]. Graphene also offers a suitable platform for accommodating metal oxide materials or conducting polymers for energy storage applications [20,21]. This is usually attributed to the large surface area of graphene which allows for uniform loading and incorporation of these materials.…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

Bello

Fashedemi

Fabiane

et al. 2013

Electrochimica Acta

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A green chemistry approach (Hydrothermal Microwave Irradiation) has been used to deposit manganese oxide on nickel foam-graphene. The 3D graphene was synthesized using nickel foam template by chemical vapour deposition (CVD) technique. Raman spectroscopy, X-ray diffraction (XRD), scanning electron and transmission electron microscopies (SEM and TEM); have been used to characterize structure and surface morphology of the composite respectively. The Raman spectroscopy measurements on the samples reveal that 3D graphene consists of mostly few layers with low defect density. The composite was tested in a three electrode configuration for electrochemical capacitor, and exhibited a specific capacitance of 305 F g -1 at a current density of 1 A g -1 and showed excellent cycling stability. The obtained results demonstrate that microwave irradiation technique could be a promising approach to synthesis graphene based functional materials for electrochemical applications.

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High-Performance Supercapacitors Based on Poly(ionic liquid)-Modified Graphene Electrodes

Cited by 685 publications

References 33 publications

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Polyaniline integrated carbon nanohorn: A superior electrode materials for advanced energy storage

Microwave assisted synthesis of MnO2 on nickel foam-graphene for electrochemical capacitor

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