Electric Double Layer Capacitor of Multiwall Carbon Nanotubes under Different Degree of Acid Oxidations

Carbon nanotubes (CNT) are a material with unique properties (mechanical, electrical, electrochemical, etc) allied with low density and high specific area. The present paper studied the electrochemical properties of carbon nanotubes growth by Chemical Vapor Depostion (CVD) technique. The samples were characterized by SEM, Raman Spectroscopy and the double layer capacitance of the powders was evaluated in a Teflon capacitor system with a Ag/AgCl (3M) as reference electrode. The catalyst remotion is provided in Hydrochloric acid washing and the wet oxidative treatments promotes the CNT oxidation and increase the pseudocapacitive response.

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Electrochemical Double-Layer Capacitors Based on Activated Bamboo-Shaped Carbon Nanotubes

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.121-123.117 ◽

2007 ◽

Vol 121-123 ◽

pp. 117-121

Author(s):

X.Y. Tao ◽

X.B. Zhang ◽

W.M. Zhu ◽

Y.W. Wang ◽

F. Liu ◽

...

Keyword(s):

Carbon Nanotubes ◽

Double Layer ◽

Specific Capacity ◽

Chemical Vapor ◽

Chemical Vapor Deposition Method ◽

Double Layer Capacitor ◽

Electrochemical Double Layer Capacitors ◽

Electrochemical Double Layer ◽

Double Layer Capacitors ◽

Koh Etching

Bamboo-shaped carbon nanotubes (BCNTs) have been synthesized by chemical vapor deposition method. The activated BCNTs after simple ball milling and KOH etching are used as polarizable electrodes in electric double layer capacitor (EDLC). Our results show that the specific capacity of BCNTs can be improved by the activation treatment.

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Requirements for performance characterization of C double-layer supercapacitors: Applications to a high specific-area C-cloth material

Journal of Power Sources ◽

10.1016/j.jpowsour.2005.06.002 ◽

2006 ◽

Vol 156 (2) ◽

pp. 725-740 ◽

Cited By ~ 101

Author(s):

Jianjun Niu ◽

Wendy G. Pell ◽

Brian E. Conway

Keyword(s):

Double Layer ◽

Specific Area ◽

Performance Characterization ◽

High Specific Area

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Scan Rates and the Disparities in the Electrochemical Double Layer Capacitor (EDLC) Performance

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.307.125 ◽

2020 ◽

Vol 307 ◽

pp. 125-130

Author(s):

Lawal Sa'adu ◽

Mohd Azman Hashim@Ismail

Keyword(s):

Carbon Nanotubes ◽

Cyclic Voltammetry ◽

Double Layer ◽

Vinylidene Fluoride ◽

High Specific Capacitance ◽

Double Layer Capacitor ◽

Electrochemical Double Layer Capacitor ◽

Commercial Carbon ◽

Poly Vinylidene Fluoride ◽

Electrochemical Double Layer

Three electrochemical double layer capacitor (EDLC) cells (Cell X, Y and Z) made from an electrode of 90 wt. % of the multiwalled commercial carbon nanotubes, 10 wt. % of poly (vinylidene fluoride-co-hexafluoropropylene) and three different samples of electrolytes polymer electrolyte made up of a compositions of 50:50, 60:40 and 70:30 wt.% of H3PO4/PVA (in ratio) soaked in a filter paper was characterized in this study. The aim is to ascertain the disparities in performances of the cells in relation to their respective scan rates. Cyclic voltammetry (CV) measurement of cells shows a high specific capacitance of 313 Fg−1 for the scan rates 10 mV was recorded from the cell with the highest composition H3PO4/PVA ratio (i.e. 70:30 wt.%). However, when the CV of the cell was measured with different scan rates, disparities in the performance occurred, as only 94 and 174 Fg−1 was recorded at the scan rates 100 and 50 mV respectively for cell-X. The result was not different when the two other cells (60:40 and 70:30 wt. % of H3PO4/PVA) were measured at the same scan rates.

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Chemical vapor deposition of nickel-group metals on multiwall carbon nanotubes

Canadian Journal of Chemistry ◽

10.1139/v07-014 ◽

2007 ◽

Vol 85 (10) ◽

pp. 645-650 ◽

Cited By ~ 3

Author(s):

Maoqi Feng ◽

Richard J Puddephatt

Keyword(s):

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

Carbon Nanotube ◽

Low Temperature ◽

Vapor Deposition ◽

Multiwall Carbon Nanotubes ◽

Chemical Vapor ◽

Pt Films ◽

Bimetallic Films ◽

Multiwall Carbon

Chemical vapor deposition (CVD) of Ni, Pd, and Pt films and of Ni/Pd and Pd/Pt bimetallic films on multiwall carbon nanotubes (MWCNTs) can be effected at low temperature if the nanotubes are pretreated by CVD of titanium carbide. In the absence of the pretreatment, the CVD leads to formation of isolated nanoparticles of the nickel-group metals. The metallized MWCNTs are curved or kinked, as a result of the interaction with the metal. Preliminary oxidation of the carbon nanotubes allows easier metallization, and the bending of the metallated nanotubes is not observed in this case.Key words: Chemical vapor deposition, platinum, palladium, nickel, carbon, nanotube.

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Growth of Single-Walled Carbon Nanotubes by Hot-Filament Chemical Vapor Deposition at Low Temperatures Using Double-Layer Film Consisting of Nickel and Cobalt Layers as Catalyst

Hyomen Kagaku ◽

10.1380/jsssj.34.346 ◽

2013 ◽

Vol 34 (7) ◽

pp. 346-351

Author(s):

Yutaka ISHIKAWA ◽

Tomohiro UENO ◽

Ryo HARUTA

Keyword(s):

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

Double Layer ◽

Vapor Deposition ◽

Low Temperatures ◽

Chemical Vapor ◽

Single Walled Carbon Nanotubes ◽

Single Walled Carbon ◽

Hot Filament ◽

Walled Carbon Nanotubes

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Optimization of Chemical Vapor Deposition Synthesis Conditions for Multiwall Carbon Nanotube by Statistical Analysis of Experiment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.55-57.533 ◽

2008 ◽

Vol 55-57 ◽

pp. 533-536

Author(s):

P. Saiprasert ◽

D. Koolpiruck ◽

S. Chiangga

Keyword(s):

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Multiwall Carbon Nanotubes ◽

Statistical Design ◽

Chemical Vapor ◽

Multiwall Carbon Nanotube ◽

Synthesis Conditions ◽

Fourier Transform Raman ◽

Multiwall Carbon

The optimization of chemical vapor deposition synthesis conditions for multiwall carbon nanotubes (MWCNTs) was experimentally investigated. Carbon nanotubes were grown on cobalt substrate thicknesses of 20, 100 and 1000 nm at 700 and 900 0C with 2 replications. The configuration and morphology of the carbon nanotubes were investigated by scanning electron microscope and Fourier transform raman spectrometer, respectively. The tendency of the parameters was evaluated by statistical design of experiment. Observations on samples produced under our optimised production process, showed that a large number of MWCNTs bundles were produced. Diameter of MWCNTs bundles ranges between 30 and 100 nm throughout the samples. From the variance analysis of the Raman spectra we observe that the thickness of cobalt and temperature of synthesis are highly significant in which the coherence length and innermost diameter increase for either the thickness increases or the temperature decreases.

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