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Nitrogen-doped carbon nanotubes with high activity for oxygen reduction in alkaline media

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1016/j.ijhydene.2010.11.025
AuteurRechercher : 1; Rechercher : ; Rechercher : 1; Rechercher : 1; Rechercher : ; Rechercher : ; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut d'innovation en piles à combustible du CNRC
FormatTexte, Article
SujetAlkaline electrolytes; Alkaline media; Catalytic activity; Chemical vapour deposition; Floating catalyst; Good stability; Half-wave potential; High activity; KOH concentration; KOH solution; Limiting current density; Metal-air battery; Multi-walled; Nitrogen-doped; Nitrogen-doped carbon nanotube (NCNT); Number of electrons; Oxygen Reduction; Oxygen reduction reaction; Oxygen reduction reaction (ORR); Performance indicators; Potential cycling; Rotating ring-disk electrode techniques; Significant impacts; Wall thickness; Benchmarking; Carbon nanotubes; Chemical vapor deposition; Cyclic voltammetry; Electrolytes; Electrolytic reduction; Fuel cells; Hydrogen; Hydrogen fuels; Nitrogen; Oxygen; Potassium hydroxide; Catalyst activity
Résumé
Nitrogen-doped carbon nanotubes (NCNTs) were prepared using a floating catalyst chemical vapour deposition method. The multiwalled NCNT contains 8.4 at% nitrogen and has a dimension of 100 nm in the diameter and 10-20 nm in the wall thickness. The catalytic activity and durability of the NCNTs towards oxygen reduction reaction (ORR) were evaluated by cyclic voltammetry (CV) and rotating ring-disk electrode (RRDE) techniques in KOH solution. In addition, the effects of KOH concentration on several ORR performance indicators of the NCNT catalyst, such as the number of electrons transferred, the diffusion-limiting current density, the onset and half-wave potentials, were also examined in electrolytes of various KOH concentrations, ranging from 0.1 to 12 M. Experimental results show that NCNTs exhibited comparable activity for ORR in alkaline electrolyte as compared with commercially available Pt/C catalyst, and much higher activity than commercial Ag/C catalysts. In addition, the NCNTs showed good stability from the potential cycling test, and the concentration of KOH had significant impact on the ORR performance indicators of the NCNT catalysts. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
Date de publication
Dans
  • International Journal of Hydrogen Energy 36, nº 3 (2011) : 2258–2265.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC21271460
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Identificateur de l’enregistrementa5217ee5-1ee5-448a-a7f4-b938e2352fe0
Enregistrement créé2014-03-24
Enregistrement modifié2020-04-21
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