High power density supercapacitor electrodes of carbon nanotube films by electrophoretic deposition

Du, Chunsheng; Pan, Ning

doi:10.1088/0957-4484/17/21/005

Cited by 357 publications

(210 citation statements)

References 31 publications

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“…Usually, the knee frequency represents not only the maximum frequency where the capacitive behavior is dominant, but also the power capability of a supercapacitor [33]. The knee frequency of the printed SWNT films is about 158 Hz, which suggests that most of the stored electrical energy can be accessible at frequencies as high as 158 Hz.…”

Section: Resultsmentioning

confidence: 99%

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

et al. 2010

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Single-walled carbon nanotube (SWNT) thin film electrodes have been printed on flexible substrates and cloth fabrics by using SWNT inks and an off-the-shelf inkjet printer, with features of controlled pattern geometry (0.4-6 cm 2 ), location, controllable thickness (20-200 nm), and tunable electrical conductivity. The as-printed SWNT films were then sandwiched together with a piece of printable polymer electrolyte to form flexible and wearable supercapacitors, which displayed good capacitive behavior even after 1,000 charge/discharge cycles. Furthermore, a simple and efficient route to produce ruthenium oxide (RuO 2 ) nanowire/SWNT hybrid films has been developed, and it was found that the knee frequency of the hybrid thin film electrodes can reach 1,500 Hz, which is much higher than the knee frequency of the bare SWNT electrodes (~158 Hz). In addition, with the integration of RuO 2 nanowires, the performance of the printed SWNT supercapacitor was significantly improved in terms of its specific capacitance of 138 F/g, power density of 96 kW/kg, and energy density of 18.8 Wh/kg. The results indicate the potential of printable energy storage devices and their significant promise for application in wearable energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

et al. 2010

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“…For this reason, carbon has become the material of choice for many commercial supercapacitors. Among the types of carbon that have been studied in detail are activated carbon (the industry standard) [6][7][8][9][10][11][12][13], various templated carbons [14][15][16][17][18][19][20][21][22][23], carbon black [24][25][26][27], carbon aerogel [28][29][30][31][32], carbon nanotubes [33][34][35][36][37][38][39][40][41][42][43][44][45][46], and graphene [47][48][49][50][51][52][53][54][55]…”

Section: Introductionmentioning

confidence: 99%

A universal equivalent circuit for carbon-based supercapacitors

Fletcher

Black

Kirkpatrick

2013

J Solid State Electrochem

136

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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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“…However, such excellent devices require electrode materials with high specific surface area, excellent electrical conductivity and porosity. Carbonaceous material such as activated carbon [14,15], CNTs [16] and more recently graphene [17] are considered as possible materials for energy storage because of their conductivity and high surface to volume ratio. Therefore several research activities have been focused on modification of these materials for improved energy storage by increasing the contact area at the electrode-electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

Functionalized graphene foam as electrode for improved electrochemical storage

Bello

Fabiane

Momodu

et al. 2014

J Solid State Electrochem

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We report on a non-covalent functionalization of graphene foam (GF) synthesised via chemical vapor deposition (CVD). The GF was treated with pyrene carboxylic acid (PCA) which acted as a source of oxygen and/ or hydroxyl groups attached to the surface of the graphene foam for its electrochemical performance improvement.The modified graphene surface enabled a high pseudocapacitive effect on the GF. A specific capacitance of 133.3 F g -1 , power density ∼145.3 kW kg -1 , and energy density ∼4.7 W h kg -1 was achieved based on the functionalized foam in 6 M KOH aqueous electrolyte. The results suggest that non-covalent functionalization might be an effective approach to overcome the restacking problem associated with graphene electrodes and also signifies the importance of surface functionalities in graphene based electrode materials.

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High power density supercapacitor electrodes of carbon nanotube films by electrophoretic deposition

Cited by 357 publications

References 31 publications

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

A universal equivalent circuit for carbon-based supercapacitors

Functionalized graphene foam as electrode for improved electrochemical storage

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