Electrical properties of electrical double layer capacitors with integrated carbon nanotube electrodes

Yoon, Beom-Jin; Jeong, Soo‐Hwan; Lee, Kun‐Hong; Kim, Hyung Seok; Park, Chan Gyung; Han, Jong Hun

doi:10.1016/j.cplett.2004.02.071

Cited by 216 publications

(94 citation statements)

References 14 publications

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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

133

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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

133

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“…Typically, there are two types of supercapacitor, according to their charge storage mechanisms. The most commonly used devices at present, mainly based on carbon materials such as porous carbon materials [74,75] and carbon nanotubes [76,77], are known as electrochemical double-layer capacitors, and they store charge electrostatically by reversible accumulation of ions at the electrode/electrolyte interface. Another type, pseudo-capacitors, adopts TM oxides or conducting polymers as electrode materials, using fast and reversible surface or near-surface reactions for charge storage.…”

Section: Supercapacitorsmentioning

confidence: 99%

Porous graphene: Properties, preparation, and potential applications

et al. 2012

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Graphene has recently emerged as an important and exciting material. Inspired by its outstanding properties, many researchers have extensively studied graphene-related materials both experimentally and theoretically. Porous graphene is a collection of graphene-related materials with nanopores in the plane. Porous graphene exhibits properties distinct from those of graphene, and it has widespread potential applications in various fields such as gas separation, hydrogen storage, DNA sequencing, and supercapacitors. In this review, we summarize recent progress in studies of the properties, preparation, and potential applications of porous graphene, and show that porous graphene is a promising material with great potential for future development.graphene, porous graphene, electronic structure, gas separation, DNA sequencing Citation:Xu P T, Yang J X, Wang K S, et al. [9] have made the preparation of large-area graphene feasible. The most intriguing aspect of graphene is its extraordinary properties. Graphene, which is constructed by strong sp 2 covalent bonds, is believed to be the strongest material ever measured [10]. Experiments have revealed that graphene exhibits a high ambipolar electric-field effect at room temperature, better conductivity than any other known material [3], and many other novel properties, including room-temperature quantum Hall effects, mass-less Dirac electrons near the K point, and high mobility of carriers (10 6 m s −1 , close to the speed of light) [11][12][13]. All these properties distinguish graphene from ordinary materials, and make graphene an ideal candidate for the manufacture of electronic devices. To develop a full understanding of its nature and realize the full potential of graphene, extensive investigations have proceeded in various directions. For instance, the electronic and magnetic properties of graphene can be modified by hydrogenation [14] and doping [15]. Another research area, porous graphene, has also attracted increasing attention recently. Porous graphene is a collection of graphene-related materials with nanopores in the plane. Depending on the production techniques used, the pore size ranges from atomic precision to nanoscale. As a result of the nanopores in the graphene plane, porous graphene exhibits properties distinct from those of pristine graphene, leading to its potential applications in numerous

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“…Instead of attaching CNTs to the current collectors mechanically (the transfer method) [2,4,5], the method of directly growing CNTs on current collectors has received considerable attentions due to the robust CNT-metal contacts and one-step process [6]. Recently, Many efforts have been made for directly growing CNTs on bulk substrates, such as Al [7], Ni [8], Ta [9], stainless steel [10] and Inconel [6,11], achieving desired electrochemical capacitive properties. However, these direct growth processes generally use a chemical vapor deposition (CVD) technique through catalyst based methods [6,7].…”

Section: Introductionmentioning

confidence: 99%