The role of metal-oxo intermediate to oxygen reduction reaction catalysis: A theoretical investigation using nitrogen-substituted carbon nanotube models

Yu Te Chan, Ming Kang Tsai

Research output: Contribution to journalArticle

Abstract

The electrochemical oxygen reduction mechanism (ORR) using the transition metal embedded and nitrogen substituted carbon-material models – TM–N4L (TM = Fe, Ru, Os, Co, Rh, Ir, Ni, Pt, and Cu; L = CNT(5,5) and graphene) are investigated. The models of group 9 elements (Co, Rh, Ir) appear to give the most uniform stepwise free energy along the 4e reduction pathway in comparison with the ideal electrochemical steps, and that could provide the most stable electric potential generation in fuels cell applications. The free energy of formation for the oxo intermediates is the determinant factor to cause the deviation from the ideal steps. The models of group 8 elements (Fe, Ru, Os) preferentially form multiple coordination bonds with the oxo intermediate via the empty d-orbitals of metal centers. In the 2e vs. 4e reduction comparison, the Fe–N4L models are found to favor 4e pathway because of the accessible O–O bond breaking barrier of Fe(OOH) intermediate around 0.5 eV while the Co models could favor the 2e pathway to form HOOH(aq). This theoretical analysis of metal-based chemistry for ORR catalysis could be helpful to the future ORR catalyst development.

Original languageEnglish
Pages (from-to)301-305
Number of pages5
JournalSurface Science
Volume677
DOIs
Publication statusPublished - 2018 Nov

Fingerprint

Carbon Nanotubes
Catalysis
catalysis
Carbon nanotubes
Nitrogen
Metals
carbon nanotubes
Oxygen
nitrogen
oxygen
metals
Free energy
free energy
Graphite
energy of formation
determinants
Graphene
fuel cells
Transition metals
Fuel cells

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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title = "The role of metal-oxo intermediate to oxygen reduction reaction catalysis: A theoretical investigation using nitrogen-substituted carbon nanotube models",
abstract = "The electrochemical oxygen reduction mechanism (ORR) using the transition metal embedded and nitrogen substituted carbon-material models – TM–N4L (TM = Fe, Ru, Os, Co, Rh, Ir, Ni, Pt, and Cu; L = CNT(5,5) and graphene) are investigated. The models of group 9 elements (Co, Rh, Ir) appear to give the most uniform stepwise free energy along the 4e reduction pathway in comparison with the ideal electrochemical steps, and that could provide the most stable electric potential generation in fuels cell applications. The free energy of formation for the oxo intermediates is the determinant factor to cause the deviation from the ideal steps. The models of group 8 elements (Fe, Ru, Os) preferentially form multiple coordination bonds with the oxo intermediate via the empty d-orbitals of metal centers. In the 2e vs. 4e reduction comparison, the Fe–N4L models are found to favor 4e pathway because of the accessible O–O bond breaking barrier of Fe(OOH) intermediate around 0.5 eV while the Co models could favor the 2e pathway to form HOOH(aq). This theoretical analysis of metal-based chemistry for ORR catalysis could be helpful to the future ORR catalyst development.",
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N2 - The electrochemical oxygen reduction mechanism (ORR) using the transition metal embedded and nitrogen substituted carbon-material models – TM–N4L (TM = Fe, Ru, Os, Co, Rh, Ir, Ni, Pt, and Cu; L = CNT(5,5) and graphene) are investigated. The models of group 9 elements (Co, Rh, Ir) appear to give the most uniform stepwise free energy along the 4e reduction pathway in comparison with the ideal electrochemical steps, and that could provide the most stable electric potential generation in fuels cell applications. The free energy of formation for the oxo intermediates is the determinant factor to cause the deviation from the ideal steps. The models of group 8 elements (Fe, Ru, Os) preferentially form multiple coordination bonds with the oxo intermediate via the empty d-orbitals of metal centers. In the 2e vs. 4e reduction comparison, the Fe–N4L models are found to favor 4e pathway because of the accessible O–O bond breaking barrier of Fe(OOH) intermediate around 0.5 eV while the Co models could favor the 2e pathway to form HOOH(aq). This theoretical analysis of metal-based chemistry for ORR catalysis could be helpful to the future ORR catalyst development.

AB - The electrochemical oxygen reduction mechanism (ORR) using the transition metal embedded and nitrogen substituted carbon-material models – TM–N4L (TM = Fe, Ru, Os, Co, Rh, Ir, Ni, Pt, and Cu; L = CNT(5,5) and graphene) are investigated. The models of group 9 elements (Co, Rh, Ir) appear to give the most uniform stepwise free energy along the 4e reduction pathway in comparison with the ideal electrochemical steps, and that could provide the most stable electric potential generation in fuels cell applications. The free energy of formation for the oxo intermediates is the determinant factor to cause the deviation from the ideal steps. The models of group 8 elements (Fe, Ru, Os) preferentially form multiple coordination bonds with the oxo intermediate via the empty d-orbitals of metal centers. In the 2e vs. 4e reduction comparison, the Fe–N4L models are found to favor 4e pathway because of the accessible O–O bond breaking barrier of Fe(OOH) intermediate around 0.5 eV while the Co models could favor the 2e pathway to form HOOH(aq). This theoretical analysis of metal-based chemistry for ORR catalysis could be helpful to the future ORR catalyst development.

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