Carbon Nanotubes for Supercapacitor

Pan, Hui; Li, Jianyi; Feng, Yuan Ping

doi:10.1007/s11671-009-9508-2

Cited by 691 publications

(366 citation statements)

References 117 publications

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“…In order to clearly show the etlect of oxidation, a smaller potential range was chosen such that the fitradaic behavior of the current collector did not dominate the non-faradaic behavior of the CNT electrode. Nevertheless, the result presented herein is comparable to the previously reported study [9).…”

Section: Introductionsupporting

confidence: 91%

Effect of Dry Oxidation on the Performance of Carbon Nanotube Arrays Electrochemical Capacitors

Aria

Gharib

2012

MRS Proc.

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In this study, the effect of dry oxidation on the electrochemical properties of carbon nanotube arrays is investigated. Oxygenated surface functional groups were introduced to the arrays by oxygen plasma treatment, where their surface concentrations were varied by controlling the exposure time. The finding presented herein shows an augmentation of nearly thirty times in term of specific capacitance when the arrays are oxidized. Similar behavior is also observed in the non-aqueous electrolytes where the specific capacitance of the oxidized carbon nanotube arrays is measured more than three times higher than that of the pristine ones. However, overexposure to oxygen plasma treatment reverses this eftect. At such high oxidation level, the damage to the graphitic structure becomes more pronounced such that the capacitive behavior of the arrays is overshadowed by their resistive behavior. These findings are important for further development of carbon nanotube based electrochemical capacitors.

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Section: Introductionsupporting

confidence: 91%

Effect of Dry Oxidation on the Performance of Carbon Nanotube Arrays Electrochemical Capacitors

Aria

Gharib

2012

MRS Proc.

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“…Normally, to obtain high surface area, CNTs are functionalized with functional groups to improve suspension stability and to reduce the bundle size before the fabrication of composites. 45 However, electrical conductivity of CNTs decreases if too much functional groups are created on the sidewall of nanotubes. Therefore, to have both high capacitance and good rate performance, a proper balance between the specific surface area and the electrical conductivity must be achieved through well controlled functionalization steps.…”

mentioning

confidence: 99%

Design and Synthesis of Hierarchical MnO₂ Nanospheres/Carbon Nanotubes/Conducting Polymer Ternary Composite for High Performance Electrochemical Electrodes

Hou

Cheng

Hobson³

et al. 2010

Nano Lett.

908

562

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For efficient use of metal oxides, such as MnO 2 and RuO 2 , in pseudocapacitors and other electrochemical applications, the poor conductivity of the metal oxide is a major problem. To tackle the problem, we have designed a ternary nanocomposite film composed of metal oxide (MnO 2 ), carbon nanotube (CNT), and conducting polymer (CP). Each component in the MnO 2 /CNT/CP film provides unique and critical function to achieve optimized electrochemical properties. The electrochemical performance of the film is evaluated by cyclic voltammetry, and constant-current charge/discharge cycling techniques. Specific capacitance (SC) of the ternary composite electrode can reach 427 F/g. Even at high mass loading and high concentration of MnO 2 (60%), the film still showed SC value as high as 200 F/g. The electrode also exhibited excellent charge/discharge rate and good cycling stability, retaining over 99% of its initial charge after 1000 cycles. The results demonstrated that MnO 2 is effectively utilized with assistance of other components (fFWNTs and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) in the electrode. Such ternary composite is very promising for the next generation high performance electrochemical supercapacitors. KEYWORDS MnO 2; fFWNTs, PEDOT-PSS, supercapacitor, effective utilization.A s the limited availability of fossil fuel and the environmental impacts of a society based on such energy sources becoming more obvious, the need for renewable energy sources has attracted attentions of the world. Systems for electrochemical energy storage and conversion include batteries, fuel cells, and supercapacitors. Among them, supercapacitors, also known as electrical double layer capacitor, ultracapacitor, or electrochemical capacitor (EC), have attracted much attention because of their high power density, long cycle life (>100 000 cycles), and rapid charging-discharging rates.1 They can be applied in a large variety of applications, including consumer electronics, memory back-up systems, industrial power, energy management, public transportation, and military devices. More importantly, supercapacitors are critical components in the next generation all-electric cars and cars based on fuel cells that use hydrogen or alcohol as clean and renewable energy media.Various materials have been investigated as the electrodes in ECs, including carboneous materials, 2-4 conducting polymers 5,6 and transition-metal oxides. 7,8 MnO 2 is generally considered to be the most promising transition metal oxides for the next generation of supercapacitors because of its high-energy density, low cost, environmental friendliness, and natural abundance. 9,10The published results thus far established that the electrochemical performance of MnO 2 depended on their morphology, porosity, specific surface area, electrical conductivity and ionic transport within the pores. 11,12 In this context, layered mesoporous birnessite-type manganese oxide materials are attracting great interest due to their high surface area, low density, a...

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“…Two 3000 F capacitors are shown in Figure 6. There is even a startup company that claims to be able to create ultra capacitors with higher energy densities than lead-acid, Nickel metal hydride and even lithium ion batteries [49]. There have also been advances in the design of the ultracapacitors using nano-tube technology to improve the surface area of the capacitor.…”

Section: Ultra-capacitorsmentioning

confidence: 99%

Towards Implementation of Smart Grid: An Updated Review on Electrical Energy Storage Systems

Biswas¹,

Azim²,

Saha³

et al. 2013

SGRE

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A smart grid will require, to greater or lesser degrees, advanced tools for planning and operation, broadly accepted communications platforms, smart sensors and controls, and real-time pricing. The smart grid has been described as something of an ecosystem with constantly communication, proactive, and virtually self-aware. The use of smart grid has a lot of economical and environmental advantages; however it has a downside of instability and unpredictability introduced by distributed generation (DG) from renewable energy into the public electric systems. Variable energies such as solar and wind power have a lack of stability and to avoid short-term fluctuations in power supplied to the grid, a local storage subsystem could be used to provide higher quality and stability in the fed energy. Energy storage systems (ESSs) would be a facilitator of smart grid deployment and a "small amount" of storage would have a "great impact" on the future power grid. The smart grid, with its various superior communications and control features, would make it possible to integrate the potential application of widely dispersed battery storage systems as well other ESSs. This work deals with a detailed updated review on available ESSs applications in future smart power grids. It also highlights latest projects carried out on different ESSs throughout all around the world.

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Carbon Nanotubes for Supercapacitor

Cited by 691 publications

References 117 publications

Effect of Dry Oxidation on the Performance of Carbon Nanotube Arrays Electrochemical Capacitors

Effect of Dry Oxidation on the Performance of Carbon Nanotube Arrays Electrochemical Capacitors

Design and Synthesis of Hierarchical MnO₂ Nanospheres/Carbon Nanotubes/Conducting Polymer Ternary Composite for High Performance Electrochemical Electrodes

Towards Implementation of Smart Grid: An Updated Review on Electrical Energy Storage Systems

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Carbon Nanotubes for Supercapacitor

Cited by 691 publications

References 117 publications

Effect of Dry Oxidation on the Performance of Carbon Nanotube Arrays Electrochemical Capacitors

Effect of Dry Oxidation on the Performance of Carbon Nanotube Arrays Electrochemical Capacitors

Design and Synthesis of Hierarchical MnO2 Nanospheres/Carbon Nanotubes/Conducting Polymer Ternary Composite for High Performance Electrochemical Electrodes

Towards Implementation of Smart Grid: An Updated Review on Electrical Energy Storage Systems

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Design and Synthesis of Hierarchical MnO₂ Nanospheres/Carbon Nanotubes/Conducting Polymer Ternary Composite for High Performance Electrochemical Electrodes