Analysis of adsorption effects on a metal-nitrogen-carbon catalyst using a rotating ring-disk study

N. D. Leonard, S. C. Barton

Research output: Contribution to journalArticle

  • 8 Citations

Abstract

A steady-state, rotating ring disk study of the oxygen reduction reaction (ORR) was conducted in acid environment using a pyrolyzed metal/nitrogen/carbon (MNC) electrocatalyst. Analysis of peroxide generation indicates that ORR proceeds both via a direct fourelectron pathway to water at high potentials and an indirect peroxide pathway at low potentials. Above 0.6 V vs RHE, the direct four-electron pathway towater without a desorbing intermediate dominates oxygen reduction because peroxide generation is inhibited due to site availability. In contrast, at potentials below 0.6 V, oxygen reduction begins to shift to the indirect peroxide pathway due to fast kinetics and higher site availability. The net peroxide generation remains relatively low over the entire range due to reduction of peroxide to water.

LanguageEnglish (US)
PagesH3100-H3105
JournalJournal of the Electrochemical Society
Volume161
Issue number13
DOIs
StatePublished - 2014

Profile

Peroxides
peroxides
Nitrogen
Carbon
Metals
Adsorption
nitrogen
catalysts
Catalysts
adsorption
carbon
rings
metals
Oxygen
oxygen
availability
Availability
Water
electrocatalysts
Electrocatalysts

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Analysis of adsorption effects on a metal-nitrogen-carbon catalyst using a rotating ring-disk study. / Leonard, N. D.; Barton, S. C.

In: Journal of the Electrochemical Society, Vol. 161, No. 13, 2014, p. H3100-H3105.

Research output: Contribution to journalArticle

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