Water Dissociation on MgO/Ag(100): Support Induced Stabilization or Electron Pairing?
Journal article, 2010

Density functional theory is used to compare water splitting on MgO(100) and MgO/Ag(100). Adsorption is considered on terraces and step edges. On the terrace, the limits of low and monolayer coverage are explored. The metal support enhances the adsorption energies of isolated OH and H through electron exchange with the oxide/metal interface, forming either OH- or H+. As a consequence, the nature of the bonding of dissociated H2O on MgO(100) is different as compared to that on MgO/Ag(100). The bonding on MgO(100) is governed by electron pairing in the oxide whereas bonding to MgO/Ag(100) is determined by the interaction with the oxide/metal interface. The difference in bond character is manifested in a red shift (similar to 200 cm(-1)) of hydrogen-bonded O-H stretching vibrations when MgO is supported.

mgo(100)

no2

adsorption

mgo

metal

hydrolysis

points

oxide surfaces

thin-films

monolayers

Author

K. Honkala

University of Jyväskylä

Anders Hellman

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Henrik Grönbeck

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 114 15 7070-7075

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Materials Science

Roots

Basic sciences

Subject Categories

Chemical Engineering

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1021/jp9116062

More information

Created

10/8/2017