Dramatic electrical conductivity improvement of carbon nanotube networks by simultaneous de-bundling and hole-doping with chlorosulfonic acid

Ryu, Yeontack; Yin, Liang; Yu, Choongho

doi:10.1039/c2jm16000e

Cited by 88 publications

(92 citation statements)

References 35 publications

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“…This in situ synthesis method to obtain nanoparticle-decorated CNTs is facile and convenient without going through additional steps to incorporate nanoparticles or other additives into CNTs. 29,30,[33][34][35][36] The high resolution TEM image and its fast Fourier transform pattern (Fig. 1d and (Fig.…”

Section: Resultsmentioning

confidence: 98%

Enhanced oxygen reduction and evolution by in situ decoration of hematite nanoparticles on carbon nanotube cathodes for high-capacity nonaqueous lithium–oxygen batteries

et al. 2015

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Lithium-oxygen (Li-O 2 ) batteries are considered to be the next generation energy storage technology due to their extremely high theoretical energy density and the simplicity of the battery cells. However, a large energy density can be obtained only with a slow discharge-charge rate, and quickly decreases upon cycling. These drawbacks can be attributed to the large overpotential and sluggish kinetics of the oxygen reduction and evolution reactions. To overcome the current problems, recent research has focused on developing catalysts made of inexpensive metal oxides and carbonaceous materials in addition to precious metals, but the role of non-precious metal catalysts in the battery performance is still largely unexplored. Here we present kinetic studies and comparative evaluation of enhanced oxygen reduction and evolution reactions with carbon nanotube (CNT) arrays containing in situ decorated a-Fe 2 O 3 nanoparticles as both a binder-free catalyst and a cathode for nonaqueous Li-O 2 batteries. Our Fe 2 O 3 -decorated CNTs greatly helped to form Li 2 O involving the four-electron reduction pathway in addition to Li 2 O 2 commonly formed via the one/two-electron reduction pathway, and thereby delivered a very large capacity of 26.5 A h g À1 at the 1 st discharge and a relatively long cycling performance (48 cycles with a capacity limit of 1.5 A h g À1 ). Unique and branch-like nanocrystalline Li 2 O and Li 2 O 2 after discharge would have lowered the overpotential for the oxygen evolution reaction. Our detailed compositional and morphological studies will be of great help to further improve the cycling performance as well as develop better non-precious metal catalysts and electrodes for Li-O 2 batteries.

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Section: Resultsmentioning

confidence: 98%

Enhanced oxygen reduction and evolution by in situ decoration of hematite nanoparticles on carbon nanotube cathodes for high-capacity nonaqueous lithium–oxygen batteries

et al. 2015

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“…Room temperature electrical conductivities for ropes are on the order of 10 6 Sm -1 , in a region classified as "glassy metals" below that of highly conducting crystalline materials like copper (10 8 Sm -1 ), and above that of short range order materials like polyaniline and other conducting polymers (10 5 Sm -1 ) (38,(45)(46)(47)(48). Much work has been done in an attempt to increase the conductivity of CNT buckypapers through chemical modification of the CNTs (49)(50)(51)(52)(53), and physical manipulation of the CNT network (50,(54)(55)(56)(57)(58)(59)(60), however, 10 6 Sm -1 remains the benchmark electrical conductivity.…”

Section: Carbon Nanotube Conductivitymentioning

confidence: 98%

Carbon Nanotube-Based Polymer Composite Thermoelectric Generators

Hewitt

Carroll

2014

ACS Symposium Series

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Carbon nanotube-based polymer composites possess several properties that make them ideal for use in low powered waste heat recovery applications not suitable to nonorganic crystalline materials even though their thermoelectric performance is lower, such as their light weight and flexible physical structure. Additionally, the favorable thermoelectric properties of the carbon nanotubes with moderate Seebeck coefficients and potentially large electrical conductivities result in modest power factors, while the low thermal conductivity of the polymer host aids in maintaining a temperature gradient across the composite. In order to effectively utilize a thermoelectric material in a practical application, they must be combined in a thin film device structure consisting of alternating p-type and n-type elements that are connected electrically in series and thermally in parallel. The device performance is then dictated by the intrinsic thermoelectric properties of the individual layers in the device. Ultimately, the total power output is limited by several extrinsic properties of the specific application.

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“…The electrical conductivities of carbon nanotubes and carbon fiber have been reported to be 1.7 × 10 4 and 6.7 × 10 3 S/cm, respectively. The electrical conductivity of graphite in the basal plane has been reported to be 1.9 × 10 2 S/cm .…”

Section: Resultsmentioning

confidence: 90%

Electrical conductivity andEMIshielding effectiveness of polyurethane foam–conductive filler composites

Kim

Lee

Jang

et al. 2016

J of Applied Polymer Sci

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The morphological, electrical, and thermal properties of polyurethane foam (PUF)/single conductive filler composites and PUF/hybrid conductive filler composites were investigated. For the PUF/single conductive filler composites, the PUF/nickel‐coated carbon fiber (NCCF) composite showed higher electrical conductivity and electromagnetic interference shielding effectiveness (EMI SE) than did the PUF/multiwall carbon nanotube (MWCNT) and PUF/graphite composites; therefore, NCCF is the most effective filler among those tested in this study. For the PUF/hybrid conductive fillers PUF/NCCF (3.0 php)/MWCNT (3.0 php) composites, the values of electrical conductivity and EMI SE were determined to be 0.171 S/cm and 24.7 dB (decibel), respectively, which were the highest among the fillers investigated in this study. NCCF and MWCNT were the most effective primary and secondary fillers, and they had a synergistic effect on the electrical conductivity and EMI SE of the PUF/NCCF/MWCNT composites. From the results of thermal conductivity and cell size of the PUF/conductive filler composites, it is suggested that a reduction in cell size lowers the thermal conductivity of the PUF/conductive filler composites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44373.

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Dramatic electrical conductivity improvement of carbon nanotube networks by simultaneous de-bundling and hole-doping with chlorosulfonic acid

Cited by 88 publications

References 35 publications

Enhanced oxygen reduction and evolution by in situ decoration of hematite nanoparticles on carbon nanotube cathodes for high-capacity nonaqueous lithium–oxygen batteries

Enhanced oxygen reduction and evolution by in situ decoration of hematite nanoparticles on carbon nanotube cathodes for high-capacity nonaqueous lithium–oxygen batteries

Carbon Nanotube-Based Polymer Composite Thermoelectric Generators

Electrical conductivity andEMIshielding effectiveness of polyurethane foam–conductive filler composites

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