Oxidation of multiwalled carbon nanotubes by air: benefits for electric double layer capacitors

Li, Chensha; Wang, Dazhi; Liang, Tongxiang; Wang, Xiaofeng; Wu, Jianjun; Hu, Xin; Ji, Liang

doi:10.1016/j.powtec.2004.04.037

Cited by 87 publications

(55 citation statements)

References 15 publications

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“…MWCNTs are known to be oxidized in the air at elevated temperatures [33,34]. Bom et al reported that raw MWCNTs were oxidized above 400-450 °C, and MWCNTs graphitized at 2800 °C were more thermally stable than the raw MWCNTs and were oxidized above 600 °C [35].…”

Section: Friction and Wear Properties At Elevated Temperaturesmentioning

confidence: 99%

Frictional and wear properties of cobalt/multiwalled carbon nanotube composite films formed by electrodeposition

Arai

Miyagawa

2013

Surface and Coatings Technology

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Carbon nanotubes (CNTs) have solid lubricity due to their unique structure and as such, CNT composites are also expected to exhibit superior tribological properties. In this study, Co/CNT composite films were fabricated using a composite electrodeposition technique and their tribological properties were investigated. Three different sizes of multiwalled carbon nanotubes (MWCNTs) were used as CNTs. The microstructures of the composite films were examined using scanning electron microscopy. Frictional and wear properties were examined using a ball-on-disk method without any lubricants at room temperature and at high temperatures (100-500 °C). The Co/MWCNT composite films had lower coefficients of friction than a cobalt film at room temperature. In contrast, the coefficients of friction of the Co/MWCNT composite film at high temperature became higher than that at room temperature and slightly lower than that of a cobalt film.

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Section: Friction and Wear Properties At Elevated Temperaturesmentioning

confidence: 99%

Frictional and wear properties of cobalt/multiwalled carbon nanotube composite films formed by electrodeposition

Arai

Miyagawa

2013

Surface and Coatings Technology

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“…Several methods have been proposed in the literature to selectively open the tube, i.e. acidic treatments [53 -56] or oxidation in air or oxygen at temperatures ranging between 600 and 700 ° C [57,58] . According to these methods, the tips of the tubes incorporating reactive fi ve -membered carbon rings have a higher curvature and higher strain than the rest of the tubes and thus should be preferentially attacked, leading to the opening of the tubes [59] .…”

Section: Structural Ordering Assisted By Thermal Treatmentmentioning

confidence: 99%

Carbon and Silicon Carbide Nanotubes Containing Catalysts

Pham‐Huu

Ersen

Ledoux

2007

Nanoparticles and Catalysis

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IntroductionCatalysis has been closely associated to the development of our technological modern society for more than 100 years and continues to be so today [1] . The two fi rst worldwide examples of catalysis intervention were fi rst, the Fischer -Tropsch synthesis, allowing the transformation of coal into valuable liquid fuels, which provided an energetic power supply to the German army during World War II [2] , where the nine plants in operation have a combined capacity of about 660 × 10 3 t per year; the second concerns the improvement of the octane number, still during World War II, to improve the performance of the allied aircraft during the battle of Britain [3] . The British lost 915 planes compared to the 1733 lost by the Germans. This was because of their superior maneuverability with 50% faster bursts of acceleration from their 100 -octane fuel compared to the German 87 -octane fuel. Since then an exponential increase in the participation of catalytic processes has been observed in the development of the industrialised countries. A catalyst allows the transformation of reactants into desired products with high selectivity reducing at the same time the cost linked with waste disposal. Many types of materials can be used as catalysts. These include metals, compounds, i.e. metal oxides, sulfi des, carbides, nitrides, etc., organometallic complexes, and enzymes. Most of the industrially employed catalysts are dispersed on high surface area supports (alumina, silica or activated carbon) in order to increase the number of active sites.The application and development of an industrial catalyst starts with research and control of materials at the molecular level followed by laboratory evaluation and a microplant reactor which pave the way to the real industrial catalyst. All of these processes cover several domains of research, from molecular chemistry to transport phenomena and solid state studies. Today the understanding of the macroscopic phenomena involved in catalysis seems to be relatively well under control for most of the different catalytic processes whereas the comprehension of what happens at a nanoscopic scale remains to be improved, in order to design a new generation of catalysts with better activity and selectivity. The direct way to 219 Nanoparticles and Catalysis. Edited by Didier Astruc

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“…These properties make them potentially suitable for fabrication of electrodes in electrochemical capacitors. 3,14 The most effective catalysts for the production of CNTs by catalytic chemical vapor deposition are known to be transition metals, such as iron (Fe), cobalt (Co), and nickel (Ni). The packing densities of CNTs grown on Fe, Co, and Ni catalysts are 4 © 10 9 , 4 © 10 9 , and 2 © 10 9 cm…”

Section: Introductionmentioning

confidence: 99%

Effects of Parameters for Preparing Carbon Nanotubes on the Capacitances of Manganese-Cobalt-Zinc Oxide/Carbon Nanotube Electrodes

Lin

2013

Electrochemistry

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A Co (catalyst)-Ti-coated silicon foil on which carbon nanotubes (CNTs) are directly grown by thermal chemical vapor deposition (CVD) with/without H 2 and using different temperatures/volume flow rates of NH 3 is optionally pretreated with hydrogen-plasma. Thereafter the CNTs are treated with nitrogen-plasma, and a manganese-cobaltzinc oxide film is deposited on the CNTs by radio frequency sputtering. For the CNT electrode, at the 100th cycle of potential cycling, its specific capacitance at a CNT growing temperature of 750°C is higher than those at 700 or 800°C and the higher the NH 3 flow rate while growing CNTs, the higher the specific capacitance. Furthermore, the specific capacitance of the manganese-cobalt-zinc oxide/CNT electrode for the CNTs grown in 50 cm 3 min −1 NH 3 is higher than that without NH 3 .

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Oxidation of multiwalled carbon nanotubes by air: benefits for electric double layer capacitors

Cited by 87 publications

References 15 publications

Frictional and wear properties of cobalt/multiwalled carbon nanotube composite films formed by electrodeposition

Frictional and wear properties of cobalt/multiwalled carbon nanotube composite films formed by electrodeposition

Carbon and Silicon Carbide Nanotubes Containing Catalysts

Effects of Parameters for Preparing Carbon Nanotubes on the Capacitances of Manganese-Cobalt-Zinc Oxide/Carbon Nanotube Electrodes

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