Low-temperature catalytic oxidation of multi-walled carbon nanotubes

Leino, Anne-Riikka; Mohl, Melinda; Kukkola, Jarmo; Mäki‐Arvela, Päivi; Kokkonen, Tommi; Shchukarev, Andrey; Kordás, Krisztián

doi:10.1016/j.carbon.2013.01.040

Cited by 22 publications

(24 citation statements)

References 64 publications

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“…Then the slope of the line was obtained to be -7569.5. Therefore, the activation energy of MWCNTs aerobic decomposition reaction is as follows: E a = -(-7569.5) 9 2.303 9 8.31 = 14563 (J/mol), which value is consistent with the literature (Hsieh et al 2010;Leino et al 2013).…”

Section: Activation Energy Of Thermal Decompositionsupporting

confidence: 76%

Effects of functional group modification on the thermal properties of nano-carbon clusters

Cai

Yang

2015

J Nanopart Res

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In this paper, the thermal properties including thermal stability, thermal decomposition activation energy and the thermal enthalpy of nano-carbon clusters (NCCs, including fullerene[60](C 60 , with a diameter of 0.71 nm), multi-walled carbon nanotubes(MWCNTs, with a diameter of 10-30 nm and a length of 1-2 lm), single-walled carbon nanotubes (SWCNTs, with a diameter of *2 nm and a length of 5-15 lm), ligands of NCC-based terpyridine (NCC-tpy), and NCC-based ruthenium complexes (NCC-tpyRuCl 3 ) were systematically studied by method of simultaneous thermogravimetric and differential thermal analysis. The results show that the modification of NCCs with terpyridine leads to a decrease in the thermal stability and in the thermal decomposition activation energy (the thermal decomposition activation energy decreased from 174.4 for C 60 , 144.9 for MWCNTs and 161.2 kJ/mol for SWCNTs to 166.2 for C 60 -tpy, 119.7 for MWCNT-tpy and 85.0 kJ/mol for SWCNT-tpy). But the modification of NCCs with terpyridine results in an increase in the enthalpy change of NCC thermal decomposition reaction. The introduction of the metal ions through complexation further decreases the thermal stability and the thermal decomposition activation energy of NCC-tpyRuCl 3 due to the catalytic oxidation of Ru(III) ions (the activation energy decreases to 124.1 for C 60 -tpyRuCl 3 , 106.4 for MWCNT-tpyRuCl 3 and 41.2 kJ/mol for SWCNT-tpyRuCl 3 ). The introduction of the metal ions also leads to a decrease in the enthalpy change of the thermal decomposition reaction.

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Section: Activation Energy Of Thermal Decompositionsupporting

confidence: 76%

Effects of functional group modification on the thermal properties of nano-carbon clusters

Cai

Yang

2015

J Nanopart Res

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“…Metal and metal-based nanoparticles (NPs), which are frequently used as active components for catalytic reactions, have captured broad attention in the past decades, especially for their potential applications in solving environmental problems 2 3 4 . Development of highly efficient oxidation catalysts at low temperatures is crucial to dramatically reduce the emissions of particulates (mostly soot particles) into the environment 5 . Among many NP-based catalysts, Ag NPs hold many advantages due to their high reactivity and relatively low cost 6 7 .…”

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confidence: 99%

Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes

et al. 2016

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To probe the nature of metal-catalysed processes and to design better metal-based catalysts, atomic scale understanding of catalytic processes is highly desirable. Here we use aberration-corrected environmental transmission electron microscopy to investigate the atomic scale processes of silver-based nanoparticles, which catalyse the oxidation of multi-wall carbon nanotubes. A direct semi-quantitative estimate of the oxidized carbon atoms by silver-based nanoparticles is achieved. A mechanism similar to the Mars–van Krevelen process is invoked to explain the catalytic oxidation process. Theoretical calculations, together with the experimental data, suggest that the oxygen molecules dissociate on the surface of silver nanoparticles and diffuse through the silver nanoparticles to reach the silver/carbon interfaces and subsequently oxidize the carbon. The lattice distortion caused by oxygen concentration gradient within the silver nanoparticles provides the direct evidence for oxygen diffusion. Such direct observation of atomic scale dynamics provides an important general methodology for investigations of catalytic processes.

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“…Notwithstanding, this result is not surprising since CNTs can undergo rapid oxidation even at very moderate temperatures in the presence of NiO, 24 PdO and CoO x nanoparticles. [24][25][26] A subsequent acid treatment of CoO x /MWCNT powders removed the metal oxide particles thus leaving behind hollow defects in the CNT structure that further increased their specific surface area (Fig. 1d).…”

Section: Characterization Of Materialsmentioning

confidence: 93%

Electric Double-Layer Capacitors Based on Multiwalled Carbon Nanotubes: Can Nanostructuring of the Nanotubes Enhance Performance?

et al. 2015

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Supercapacitors prepared from chemically modified and vacuum filtered buckypapers were studied. The aim was to evaluate how its pore structure impacts on the specific capacitance, energy and power density in different electrolytes. The specific capacitance varies in a linear fashion with the specific surface area for nanotubes modified by the means of catalytic, low-temperature partial catalytic oxidation using cobalt oxide nanoparticles decorating the nanotubes. In contrast, electrodes composed of nanotubes preactivated in CO 2 demonstrated only a minor increase in their specific capacitance, despite the observed significant increase in specific surface area. The radically improved surface area was a result of emergence and deposition of soot on the nanotubes during the activation process, as revealed by transmission electron microscopy. Among six different types of electrode materials, the CoO x decorated materials proved to have the highest specific capacitance (~25 F/g in aqueous KOH and ~15 F/g in triethylsulfonium bis(trifluoromethylsulfonyl)imide ionic liquid). Thus, highly structured carbon nanotubes giving rise to energy and power storage densities comparable with commercial and other multiwalled carbon nanotube based electric double-layer capacitor devices were obtained.

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Low-temperature catalytic oxidation of multi-walled carbon nanotubes

Cited by 22 publications

References 64 publications

Effects of functional group modification on the thermal properties of nano-carbon clusters

Effects of functional group modification on the thermal properties of nano-carbon clusters

Atomic scale observation of oxygen delivery during silver–oxygen nanoparticle catalysed oxidation of carbon nanotubes

Electric Double-Layer Capacitors Based on Multiwalled Carbon Nanotubes: Can Nanostructuring of the Nanotubes Enhance Performance?

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