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Title: New Bonding Model of Radical Adsorbate on Lattice Oxygen of Perovskites

Journal Article · · Journal of Physical Chemistry Letters

In this paper, a new model of bonding between radical adsorbates and lattice oxygens is proposed that considers both the adsorbate–oxygen bonding and the weakening of the metal–oxygen bonds. Density functional calculations of SrMO3 perovskites for M being 3d, 4d, and 5d transition metals are used to correlate the bulk electronic structure with the surface-oxygen reactivity. Occupation of the metal–oxygen antibonding states, examined via the crystal orbital Hamilton population (COHP), is found to be a useful bulk descriptor that correlates with the vacancy formation energy of the lattice oxygen and its hydrogen adsorption energy. Analysis of density-of-states and COHP indicates that H adsorption energy is a combined result of formation of the O–H bond and the weakening of the surface metal–oxygen bond due to occupation of the metal–oxygen antibonding states by the electron from H. Lastly, this insight will be useful in understanding the trends in surface reactivity of perovskites and transition-metal oxides in general.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1502543
Journal Information:
Journal of Physical Chemistry Letters, Vol. 9, Issue 21; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (4)

Facile CO Oxidation on Oxygen‐functionalized MXenes via the Mars‐van Krevelen Mechanism journal December 2019
Effect of the oxygen coordination environment of Ca–Mn oxides on the catalytic performance of Pd supported catalysts for aerobic oxidation of 5-hydroxymethyl-2-furfural journal January 2019
Screening highly active perovskites for hydrogen-evolving reaction via unifying ionic electronegativity descriptor journal August 2019
Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts journal November 2019

Figures / Tables (6)


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