Kinetics of oxygen transfer reactions on the graphene surface: Part I. NO vs. O2

Andrea M. Oyarzún, Adolfo J.A. Salgado-Casanova, Ximena A. Garciá-Carmona, Ljubisa R. Radovic

Research output: Contribution to journalArticle

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Abstract

Oxygen transfer reactions on carbon surfaces are of great interest for a variety of industries, as well as for the development of new technologies (e.g., NO gas detectors). They are also at the heart of the chemical surface properties and behavior of graphene-based materials. In this study we use quantum chemistry to discover the most probable ground and transition states of reactants, surface intermediates and products in the transfer of oxygen from nitric oxide and O2 to form N2 and CO/CO2. The graphene-NO reaction is more complex and dependent on site availability. Whereas O2 chemisorption is barrierless, adsorption of NO is a complex function of geometric and electronic factors. Thus, the desorption of N2 is highly favored both kinetically (from a C(NN) complex and O-down adsorption of N2O) and thermodynamically (especially via the N2O intermediate). These results are analogous to the experimental findings with a potassium catalyst. Adsorption of the NO dimer on H-saturated sites may account for the reversible chemisorption at low temperatures. These findings allowed us to propose a concise mechanism of oxygen transfer, which highlights the similarities and differences with respect to the graphene-O2 reaction. It is also consistent with the experimentally observed concentration dependence of these reactions.

Original languageEnglish (US)
Pages (from-to)472-484
Number of pages13
JournalCarbon
Volume99
DOIs
StatePublished - Apr 1 2016

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Graphite
Graphene
Chemisorption
Oxygen
Adsorption
Kinetics
Gas detectors
Quantum chemistry
Nitric oxide
Carbon Monoxide
Dimers
Surface properties
Potassium
Desorption
Nitric Oxide
Carbon
Availability
Catalysts
Industry
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Oyarzún, Andrea M. ; Salgado-Casanova, Adolfo J.A. ; Garciá-Carmona, Ximena A. ; Radovic, Ljubisa R. / Kinetics of oxygen transfer reactions on the graphene surface : Part I. NO vs. O2. In: Carbon. 2016 ; Vol. 99. pp. 472-484.
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Kinetics of oxygen transfer reactions on the graphene surface : Part I. NO vs. O2. / Oyarzún, Andrea M.; Salgado-Casanova, Adolfo J.A.; Garciá-Carmona, Ximena A.; Radovic, Ljubisa R.

In: Carbon, Vol. 99, 01.04.2016, p. 472-484.

Research output: Contribution to journalArticle

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AU - Oyarzún, Andrea M.

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AU - Radovic, Ljubisa R.

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