Electrochemical Characterization of Films of Single-Walled Carbon Nanotubes and Their Possible Application in Supercapacitors

Liu, Chong‐Yang; Bard, Allen J.; Wudl, Fred; Weitz, Iris S.; Heath, James R.

doi:10.1149/1.1390910

Cited by 291 publications

(117 citation statements)

References 7 publications

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“…For example, carbon nanotubes have been formed into electrodes for Li-ion secondary batteries [1][2][3][4][5], for hydrogen storage in fuel cells [6], and for supercapacitors [7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

High power density supercapacitors using locally aligned carbon nanotube electrodes

Yeh²,

2005

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TitleHigh power density supercapacitors using locally aligned carbon nanotube electrodes Abstract A new form of thin films formed by multi-walled carbon nanotubes exhibiting high packing density and local alignment were fabricated using a highly concentrated colloidal suspension of carbon nanotubes. Electrical double layer capacitors built from these film electrodes exhibited a close to rectangular cyclic voltammogram even at a high scan rate of 1000 mV s −1 , and produced very high specific power density of about 30 kW kg −1 , ideal for surge-power delivery applications. The preparation procedure is very simple, and does not require any binders. It has potential for highly efficient manufacturing of high power density supercapacitors and other similar electronic devices.

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Section: Introductionmentioning

confidence: 99%

High power density supercapacitors using locally aligned carbon nanotube electrodes

Yeh²,

2005

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“…Besides, postdeposited SWCNT film on the substrates can be used as electrode materials for the supercapacitor and excellent results have been reported. [21][22][23][24] However, these SWCNT films used as supercapacitor electrodes have to be deposited onto the substrates and the resulting SWCNT films with substrates are not flexible and tough enough. SWCNT arrays were also used as the electrodes of supercapacitors and ultrahigh energy density and power density were achieved.…”

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confidence: 99%

Compact-designed supercapacitors using free-standing single-walled carbon nanotube films

Niu

Zhou

Chen

et al. 2011

Energy Environ. Sci.

321

214

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We reported the realization of assembling compact-designed supercapacitors using large-scaled freestanding and flexible single-walled carbon nanotube (SWCNT) films as both anode and cathode. A prototype of the processing procedures was developed to obtain the uniform spreading of the SWCNT films onto the separators serving as both electrodes and charge collectors without metallic current collectors, leading to a simplified and lightweight architecture. The area of SWCNT film on a separator can be scaled up and its thickness can be extended. High energy and power densities (43.7 Wh kg -1 and 197.3 kW kg -1 , respectively) were achieved from the prepared SWCNT film-based compact-designed supercapacitors with small equivalent series resistance. The specific capacitance of this kind of compact-designed SWCNT film supercapacitor is about 35 F g -1 . These results clearly show the potential application of free-standing SWCNT film in compact-designed supercapacitor with enhanced performance and significantly improved energy and power densities. We reported the realization of assembling compact-designed supercapacitors using large-scaled freestanding and flexible single-walled carbon nanotube (SWCNT) films as both anode and cathode. A prototype of the processing procedures was developed to obtain the uniform spreading of the SWCNT films onto the separators serving as both electrodes and charge collectors without metallic current collectors, leading to a simplified and lightweight architecture. The area of SWCNT film on a separator can be scaled up and its thickness can be extended. High energy and power densities (43.7 Wh kg À1 and 197.3 kW kg À1, respectively) were achieved from the prepared SWCNT film-based compact-designed supercapacitors with small equivalent series resistance. The specific capacitance of this kind of compact-designed SWCNT film supercapacitor is about 35 F g À1 . These results clearly show the potential application of free-standing SWCNT film in compact-designed supercapacitor with enhanced performance and significantly improved energy and power densities.

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“…[4][5][6][7][8][9] Electrodes modified with CNT and used to analyze biomolecules have received much interest. [10][11][12][13][14][15][16][17][18] However, no preparation of electrodes modified by nano metal particlesdecorated carbon nanotubes has been reported. In our research, a glassy carbon electrode modified with platinum nano particles decorated on carbon nanotubes (Pt-CNT/GCE) was developed.…”

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confidence: 99%

Electrocatalytic Oxidation of Hydrogen Peroxide and Cysteine at a Glassy Carbon Electrode Modified with Platinum Nanoparticle-deposited Carbon Nanotubes

Tian

2005

ANAL. SCI.

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Dispersed metal particles exhibit excellent catalytic activity that closely relates to their minimized diameters. The micro and nano particles trend to have excellent quality in chemical and electrochemical reactions. For this purpose, metal particles have been successfully dispersed and decorated on some substrates such as carbon and conductive polymers to make catalyst. [1][2][3] It is essential to find ways to further reduce diameters of these metal particles to promote their catalytic activity. The diameters of nano particles vary with the medium and the substrates on which they are made. As one typical nano material, carbon nanotubes (CNT) whose diameters vary from 0.33 to less than 100 nanometers were made up with hexagonal lattices of carbon. Because of their characteristic electron conductivity valves, pore structures and absorption abilities they are fit for metal substrates. Various metals and alloys were deposited on them. [4][5][6][7][8][9] Electrodes modified with CNT and used to analyze biomolecules have received much interest. [10][11][12][13][14][15][16][17][18] However, no preparation of electrodes modified by nano metal particlesdecorated carbon nanotubes has been reported. In our research, a glassy carbon electrode modified with platinum nano particles decorated on carbon nanotubes (Pt-CNT/GCE) was developed. Carbon nanotubes decorated with platinum nano particles (Pt-CNT) were obtained by chemical method, 19 and then were immobilized on the surfaces of GCE electrodes. Electrochemical determinations using metals particle-modified electrodes have been focused on. [20][21][22][23][24][25][26][27] On the other hand, it is also important to prepare an amperometric sensor for the measurement of hydrogen peroxide and cysteine. 28 In the paper, electrocatalytic oxidation for hydrogen peroxide and cysteine at Pt-CNT/GCE was investigated. Due to the nano-sized platinum particles deposited on CNT, the currents at Pt-CNT/GCE were almost 3-times higher and the electrode reaction rates were obviously faster, compared with bare platinum electrode results. So, the Pt-CNT/GCE has high electro-catalytic activity, which is suitable for preparing enzyme electrodes with better sensitivity, repeatability and stability. Experimental Equipment and reagentsElectrochemical experiments were carried out using a CHI660B electrochemical workstation (CHI Instruments Inc., US). A glassy carbon electrode (φ = 2 mm) modified with Pt-CNT was used as the working electrode. A platinum wire and KCl saturated Ag/AgCl electrodes were employed as the counter electrode and a reference electrode, respectively. For comparison of the electro-catalytic activities, a bare Pt electrode (φ = 2 mm) was also used as a working electrode.Carbon nanotubes (inner φ = 4 -8 nm, outer φ = 10 -30 nm) were supplied by the Dept. of Materials, Zhejiang University; they were synthesized by Chemical Vapor Deposit method. 0.1 mol/L phosphate buffer solution (pH 7.0) was prepared by freshly distilled water. 10 mg/mL H2PtCl6 was made in 6 mol/L HCl solutions...

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Electrochemical Characterization of Films of Single-Walled Carbon Nanotubes and Their Possible Application in Supercapacitors

Cited by 291 publications

References 7 publications

High power density supercapacitors using locally aligned carbon nanotube electrodes

High power density supercapacitors using locally aligned carbon nanotube electrodes

Compact-designed supercapacitors using free-standing single-walled carbon nanotube films

Electrocatalytic Oxidation of Hydrogen Peroxide and Cysteine at a Glassy Carbon Electrode Modified with Platinum Nanoparticle-deposited Carbon Nanotubes

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