Supercapacitors using carbon nanotubes films by electrophoretic deposition

Du, Chunsheng; Pan, Ning

doi:10.1016/j.jpowsour.2006.02.092

Cited by 273 publications

(171 citation statements)

References 37 publications

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“…As shown in Fig. 3C, the specific capacitances of all-paper SCs at various currents are superior to the previously reported values with pure CNT electrodes on flat substrates (6,(26)(27)(28)(29)(30)(31)(32)(33), and are even close to those of pseudocapacitors based on the polymer/CNT composites (34,35). A high specific capacitance of 200 F/g was achieved for devices in sulfuric acid electrolyte (Fig.…”

Section: Resultsmentioning

confidence: 44%

See 1 more Smart Citation

Highly conductive paper for energy-storage devices

Hu¹,

Choi²,

Yang³

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

1,159

899

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Paper, invented more than 2,000 years ago and widely used today in our everyday lives, is explored in this study as a platform for energy-storage devices by integration with 1D nanomaterials. Here, we show that commercially available paper can be made highly conductive with a sheet resistance as low as 1 ohm per square (⍀/sq) by using simple solution processes to achieve conformal coating of single-walled carbon nanotube (CNT) and silver nanowire films. Compared with plastics, paper substrates can dramatically improve film adhesion, greatly simplify the coating process, and significantly lower the cost. Supercapacitors based on CNT-conductive paper show excellent performance. When only CNT mass is considered, a specific capacitance of 200 F/g, a specific energy of 30 -47 Watt-hour/kilogram (Wh/kg), a specific power of 200,000 W/kg, and a stable cycling life over 40,000 cycles are achieved. These values are much better than those of devices on other flat substrates, such as plastics. Even in a case in which the weight of all of the dead components is considered, a specific energy of 7.5 Wh/kg is achieved. In addition, this conductive paper can be used as an excellent lightweight current collector in lithiumion batteries to replace the existing metallic counterparts. This work suggests that our conductive paper can be a highly scalable and low-cost solution for high-performance energy storage devices.conformal coating ͉ carbon nanotubes ͉ nanomaterial ͉ solution process P rintable solution processing has been exploited to deposit various nanomaterials, such as fullerene, carbon nanotubes (CNTs), nanocrystals, and nanowires for large-scale applications, including thin-film transistors (1-3), solar cells (4, 5), and energy-storage devices (6, 7), because the process is low-cost while maintaining the unique properties of the nanomaterials. In these processes, flat substrates, such as glass, metallic films, Si wafers, and plastics, have been used to hold nanostructure films. Nanostructured materials are usually first capped with surfactant molecules so that they can be well-dispersed as separated particles in a solvent to form ''ink.'' The ink is then deposited onto the flat substrates, followed by surfactant removal and solvent evaporation. To produce high-quality films, significant efforts have been spent on ink formulation and rheology adjustment. Moreover, because the surfactants are normally insulating, and thus limit the charge transfer between the nanomaterials, their removal is particularly critical. However, this step involves extensive washing and chemical displacement, which often cause mechanical detachment of the film from the flat substrate. Polymer binders or adhesives have been used to improve the binding of nanomaterials to substrates, but these can also cause an undesirable decrease in the film conductivity. These additional procedures increase the complexity of solution processing and result in high cost and low throughput. Here, we exploit paper substrates used in daily life to solve these issues a...

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Section: Resultsmentioning

confidence: 44%

“…CNTs deposited on porous paper are more accessible to ions in the electrolyte than those on flat substrates (6,(26)(27)(28)(29)(30)(31)(32)(33), which can result in high power density. In addition, the paper itself can function well as a separator.…”

Section: Resultsmentioning

confidence: 99%

Highly conductive paper for energy-storage devices

Hu¹,

Choi²,

Yang³

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

1,159

899

View full text Add to dashboard Cite

show abstract

“…The almost vertical curve at low frequencies suggested near-ideal capacitive energy storage behavior of the cells. A knee frequency [5] at around 385 Hz was found for all cells, indicating their similar resistive behaviors at different frequencies. This value is very close to the reported knee frequency of activated graphene-based supercapacitors at ca.…”

Section: Resultsmentioning

confidence: 64%

Enhanced performance of carbon/carbon supercapacitors upon graphene addition

Zhang

Lum

Pan

2017

Nanotechnol. Environ. Eng.

Self Cite

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Graphene has great potential for application in capacitive energy storage devices. In this study, we have investigated the effects of employing reduced graphene oxide (rGO) either as an additional supplement or as a total replacement of carbon black, the current conductive additive used in commercial carbon/carbon supercapacitors. We also examined the impact of incorporating rGO before and during the slurry preparation. Some electrochemical and morphological studies were conducted to compare the rGO and carbon black in performance enhancement for conventional activated carbon-based electrodes. Our results have demonstrated the benefits of incorporating graphene into the current carbon/carbon supercapacitors.

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“…In contrast, the graphite voltammogram shows narrow loops with a large oblique angle and an elbow around 0.8V (fig 1a), which is typical of a highly resistive electrode [7]. A large non-capacitative current response is also present between 0.8 and 1.5 V for the graphite sample (fig 1a), which is quite unexpected due to the relatively high conductivity of graphite.…”

Section: A Capacitive Behaviormentioning

confidence: 92%

Use of vertically-aligned carbon nanotube array to enhance the performance of electrochemical capacitors

Guittet

Aria

Gharib

2011

2011 11th IEEE International Conference on Nanotechnology

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-In the domain of energy storage, electrochemical capacitors have numerous applications ranging from hybrid vehicles to consumer electronics, with very high power density at the cost of relatively low energy storage. Here, we report an approach that uses vertically aligned carbon nanotube arrays as electrodes in electrochemical capacitors. Different electrolytes were used and multiple parameters of carbon nanotube array were compared: carbon nanotube arrays were shown to be two to three times better than graphite in term of specific capacitance, while the surface functionalization was demonstrated to be a critical factor in both aqueous and nonaqueous solutions to increase the specific capacitance. We found that a maximum energy density of 21 Wh/kg at a power density of 1.1 kW/kg for a hydrophilic electrode, could be easily achieved by using tetraethylammonium tetrafluoroborate in propylene carbonate. These are encouraging results in the path of energy-storage devices with both high energy density and power density, using only carbon-based materials for the electrodes with a very long lifetime, of tens of thousands of cycles.

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Supercapacitors using carbon nanotubes films by electrophoretic deposition

Cited by 273 publications

References 37 publications

Highly conductive paper for energy-storage devices

Highly conductive paper for energy-storage devices

Enhanced performance of carbon/carbon supercapacitors upon graphene addition

Use of vertically-aligned carbon nanotube array to enhance the performance of electrochemical capacitors

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