Significantly enhanced charge conduction in electric double layer capacitors using carbon nanotube-grafted activated carbon electrodes

Huang, Chengwei; Chuang, Chih-Min; Ting, Jyh‐Ming; Teng, Hsisheng

doi:10.1016/j.jpowsour.2008.04.075

Cited by 56 publications

(41 citation statements)

References 49 publications

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“…A Warburg diffusion element is incorporated in the circuit to emphasize the distributed resistance for ion diffusion in the micropores. 22 The results indicate that the composite material reduced the polarization and improved the hydrophilicity of the CNT surface, resulting in the decrease of internal resistance between electrode and electrolyte and increase of the efficiency of charge and masstransfer on the electrode/electrolyte interface. 5 This result of Nyquist plot agreed well with that from the cycle life performance.…”

Section: Resultsmentioning

confidence: 94%

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Kim¹,

Kim²,

Morita

et al. 2010

Bulletin of the Korean Chemical Society

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To reduce polarization of electrochemical capacitor based on carbon nanotube, titanium oxide nanoparticles were deposited by ultrasound. The pore distribution of TiO2/CNT nanoparticle exhibited surface area of 341 m 2 g -1 when TiO2 content was 4 wt %, which was better than that of pristine CNT with surface area of 188 m 2 g -1 . The analyses indicated that titanium oxide (particle diameter < 20 nm) was deposited on the CNT surface. The electrochemical performance was evaluated by using cyclic voltammetry (CV), impedance measurement, and constant-current charge/discharge cycling techniques. The TiO2/CNT composite electrode showed relatively better electrochemical behaviors than CNT electrode by increasing the specific capacitance from 22 Fg -1 to 37 Fg -1 in 1 M H2SO4 solution. A symmetric cell assembled with the composite electrodes showed the specific capacitance value of 11 Fg -1 at a current loading of 0.5 mAcm -2 during initial cycling.

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Section: Resultsmentioning

confidence: 94%

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Kim¹,

Kim²,

Morita

et al. 2010

Bulletin of the Korean Chemical Society

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“…The insert in (a) is the equivalent circuit. (b) is an enlarged view of (a) due to the contact interface (C c and R c ), a Warburg diffusion element attributable to the ion migration through the carbon film (Z W ), and the capacitance inside the pores, C d [59,60]. The Warburg element is given by…”

Section: Resultsmentioning

confidence: 99%

Binder-free activated carbon/carbon nanotube paper electrodes for use in supercapacitors

et al. 2011

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Novel inexpensive, light, flexible, and even rollup or wearable devices are required for multi-functional portable electronics and developing new versatile and flexible electrode materials as alternatives to the materials used in contemporary batteries and supercapacitors is a key challenge. Here, binder-free activated carbon (AC)/carbon nanotube (CNT) paper electrodes for use in advanced supercapacitors have been fabricated based on low-cost, industrial-grade aligned CNTs. By a two-step shearing strategy, aligned CNTs were dispersed into individual long CNTs, and then 90 wt%-99 wt% of AC powder was incorporated into the CNT pulp and the AC/CNT paper electrode was fabricated by deposition on a filter. The specific capacity, rate performance, and power density of the AC/CNT paper electrode were better than the corresponding values for an AC/acetylene black electrode. The capacity reached a maximum value of 267.6 F/g with a CNT loading of 5 wt%, and the energy density and power density were 22.5 W·h/kg and 7.3 kW/kg at a high current density of 20 A/g. The AC/CNT paper electrode also showed a good cycle performance, with 97.5% of the original capacity retained after 5000 cycles at a scan rate of 200 mV/s. This method affords not only a promising paper-like nanocomposite for use in low-cost and flexible supercapacitors, but also a general way of fabricating multi-functional paper-like CNT-based nanocomposites for use in devices such as flexible lithium ion batteries and solar cells.

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“…In particular, the combination of its high conductivity and high surface area makes CNTs very attractive to be used as electrodes in electrochemical applications as well as electron field emission sources [3][4][5][6][7][8] . Specially, CNTs and carbon nanofibers (CNFs) have become key materials as electrodes in proton exchange membranes (PEM) fuel cells [6][7][8][9][10][11][12][13][14][15] . For instance, the intrinsic properties of carbon fibers such as high flexibility, mechanical and chemical stability can ensure a higher durability, versatility and lifetime of the electrode 11,13 .…”

Section: Introductionmentioning

confidence: 99%

“…Besides that, the interactions between the gases with the catalysts nanoparticles on the external wall of the CNTs are more efficient than those interactions at the internal porous of carbon black 12 . Another advantage related with the growth of CNTs on CFs, is the direct electron conduction due to the weak interaction between the deposited catalyst and the carbon substrate 15 . Additionally, a higher electron emission was also observed in CNT grown on carbon fibers compared to CNT on Si, revealing that multiwalled carbon nanotubes (MWCNTs) on carbon fibers has a great potential for emission displays 5 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical activity using vertically aligned carbon nanotube electrodes grown on carbon fiber

et al. 2011

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Vertically aligned carbon nanotubes were successfully grown on flexible carbon fibers by plasma enhanced chemical vapor deposition. The diameter of the CNT is controllable by adjusting the thickness of the catalyst Ni layer deposited on the fiber. Vertically aligned nanotubes were grown in a Plasma Enhanced Chemical Deposition system (PECVD) at a temperature of 630 °C, d.c. bias of -600 V and 160 and 68 sccm flow of ammonia and acetylene, respectively. Using cyclic voltammetry measurements, an increase of the surface area of our electrodes, up to 50 times higher, was observed in our samples with CNT. The combination of VACNTs with flexible carbon fibers can have a significant impact on applications ranging from sensors to electrodes for fuel cells.

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Significantly enhanced charge conduction in electric double layer capacitors using carbon nanotube-grafted activated carbon electrodes

Cited by 56 publications

References 49 publications

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Binder-free activated carbon/carbon nanotube paper electrodes for use in supercapacitors

Enhanced electrochemical activity using vertically aligned carbon nanotube electrodes grown on carbon fiber

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