Abstract
Density functional theory (DFT) was used to investigate O2 chemisorption on the edge sites of graphene doped with quaternary nitrogen (N-graphene). The location of the doped quaternary N within the graphene cluster was systematically varied to determine the effect of interior versus edge doping on the reactivity of the edge graphene sites. Model 1b, where a quaternary-N atom is at the zigzag edge of the graphene cluster, is found to be the most favored structure and strongly adsorbs O2 molecule via a “two feet” geometry. For this most stable O2 binding configuration, the potential-dependent free energy of reaction for the subsequent oxygen reduction reaction (ORR) steps was evaluated. The favored four electron-proton transfer mechanism passes through a dissociative O*+OH* state instead of an OOH* intermediate, followed by a series of reduction steps to produce water. At the equilibrium potential for ORR of 1.23 V-NHE, the protonation of O* and OH* both show uphill steps, but the production of O* is facile with a small overpotential. An applied potential of −0.15 V-NHE is required to facilitate the protonation of OH* to water, a larger overpotential than observed experimentally. While solvent effects may reduce this overpotential, our results suggest that the edge of the N-graphene is very active towards activation of O2 and production of O* and OH* but because of strong binding of the oxygen atom, the subsequent steps of the ORR reaction will be hindered. Mechanisms that have OH* formed at the edge site and then move to adjacent sites for more facile protonation will have to be explored in the future.
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Acknowledgments
The authors gratefully acknowledge financial support from the U.S. Department of Energy-Basic Energy Sciences (DE-FG02-07ER15896). The Ohio Supercomputer Center (OSC) is also acknowledged for generous computational support of this research.
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Bao, X., Nie, X., von Deak, D. et al. A First-Principles Study of the Role of Quaternary-N Doping on the Oxygen Reduction Reaction Activity and Selectivity of Graphene Edge Sites. Top Catal 56, 1623–1633 (2013). https://doi.org/10.1007/s11244-013-0097-z
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DOI: https://doi.org/10.1007/s11244-013-0097-z