Modified porous carbon materials as catalytic support for cathodic reduction of dioxygen

Biniak, S.; Walczyk, M.; Szymański, G.

doi:10.1016/s0378-3820(02)00182-0

Cited by 23 publications

(19 citation statements)

References 13 publications

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“…% surface nitrogen indicate that nitrogen is coordinated as pyridiniclike, pyrrolic-like, and quaternary-like arrangements. The existence of nitrogen functional groups is significant enough to impart a basic nature to the N-CNTs, measuring an average pH pzc value of 9.2 ¡ 0.4, consistent with other reports of alkaline pH pzc values for nitrogenated-carbons, 43,44 whereas the non-doped CNTs have an average pH pzc value of 8.0 ¡ 0.4. Iodometric titrations performed on suspensions of both CNT varieties also support the increased basicity of N-doped CNTs where nitrogen-containing CNTs contained 2.3 ¡ 0.3 meq g 21 basic sites compared to 1.5 ¡ 0.3 meq g 21 for non-doped CNTs.…”

Section: Xps Analysissupporting

confidence: 89%

Electrochemical oxidation of catecholamines and catechols at carbon nanotube electrodes

Maldonado

Morin

Stevenson

2006

Analyst

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The differences in the electrochemical oxidation of two commonly known catecholamines, dopamine and norepinephrine, and one catechol, dihydroxyphenylacetic acid (DOPAC), at three different types of carbon based electrodes comprising conventionally polished glassy carbon (GC), nitrogen-doped carbon nanotubes (N-CNTs), and non-doped CNTs were assessed. Raman microscopy and X-ray photoelectron spectroscopy (XPS) were employed to evaluate structural and compositional properties. Raman measurements indicate that N-CNT electrodes have ca. 2.4 times more edge plane sites over non-doped CNTs. XPS data show no evidence of oxygen functionalities at the surface of either CNT type. N-CNTs possess 4.0 at. % nitrogen as pyridinic, pyrrolic, and quaternary nitrogen functionalities that result in positively charged carbon surfaces in neutral and acidic solutions. The electrochemical behavior of the various carbon electrodes were investigated by cyclic voltammetry conducted in pH 5.8 acetate buffer. Semiintegral analysis of the voltammograms reveals a significant adsorptive character of dopamine and norepinephrine oxidation at N-CNT electrodes. Larger peak splittings, DeltaE(p), for the cyclic voltammograms of both catecholamines and a smaller DeltaE(p) for the cyclic voltammogram for DOPAC at N-CNT electrodes suggest that electrostatic interactions hinder oxidation of cationic dopamine and norepinephrine, but facilitate anionic DOPAC oxidation. These observations were supported by titrimetry of solid suspensions to determine the pH of point of zero charge (pH(pzc)) and estimate the number of basic sites for both CNT varieties. This study demonstrates that carbon purity, the presence of exposed edge plane sites, surface charge, and basicity of CNTs are important factors for influencing adsorption and enhancing the electrochemical oxidation of catecholamines and catechols.

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Section: Xps Analysissupporting

confidence: 89%

Electrochemical oxidation of catecholamines and catechols at carbon nanotube electrodes

Maldonado

Morin

Stevenson

2006

Analyst

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“…Electrons are transferred from the catalyst to adsorbed oxygen molecules producing highly reactive species, e.g. radicals [58,59].…”

Section: Electrochemical Characteristicsmentioning

confidence: 99%

Examination of the electroactive composites containing cobalt nanoclusters and nitrogen-doped nanostructured carbon as electrocatalysts for oxygen reduction reaction

Pacuła

Ikeda

Masuda

et al. 2012

Journal of Power Sources

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“…Lanthanum and manganese containing perovskite type oxides [22,23] belong to the group of catalysts of potential catalytic activity towards ketonization of primary alcohols. Moreover, the application of carbon-type catalyst support enables utilisation of specific surfaces [24,25] and catalytic [26,27] properties of carbon. In addition, one may expect that some synergetic effects occur in the metal oxide-carbon [28,29] system as often happens in case of other hybrid catalysts.…”

Section: Formation Of Metal Oxide Nanocrystallites In Carbonmentioning

confidence: 99%

Nanoscale Phenomena Occurring during Pyrolysis of Salix viminalis Wood

Cyganiuk

Klimkiewicz

Olejniczak

et al. 2013

Journal of Materials

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Selective utilisation of unique properties of Salix viminalis wood enables preparation of materials of nanotechnologic properties. Thermal decomposition of lignin-cellulose organic matter results in the formation of a nanostructured porous carbon matrix (charcoal). Narrowed pore size distribution (PSD) in the subnanometer range allows to consider the charcoals as carbon molecular sieves (CMSs), which are capable of separating even chemically inert gases like neon, krypton, and nitrogen. High tolerance of Salix viminalis to heavy metal ions enables enriching living plant tissues with metal ions like lanthanum and manganese. Such ions may later form LaMnO 3 with parallel transformation of plant tissues (organic matter) to carbon matrix using a heat treatment. In this way, one gets a hybrid material: a porous carbon matrix with uniformly suspended nanocrystallites of LaMoO 3 . The crystallites are in the catalytically active phase during the conversion of n-butanol to heptanone-4 with high yield and selectivity.

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Modified porous carbon materials as catalytic support for cathodic reduction of dioxygen

Cited by 23 publications

References 13 publications

Electrochemical oxidation of catecholamines and catechols at carbon nanotube electrodes

Electrochemical oxidation of catecholamines and catechols at carbon nanotube electrodes

Examination of the electroactive composites containing cobalt nanoclusters and nitrogen-doped nanostructured carbon as electrocatalysts for oxygen reduction reaction

Nanoscale Phenomena Occurring during Pyrolysis of Salix viminalis Wood

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