title: Orienting oxygen vacancies for fast catalytic reaction.
abstract: A strategy to enhance the catalytic activity at the surface of an oxide thin film is unveiled through epitaxial orientation control of the surface oxygen vacancy concentration. By tuning the direction of the oxygen vacancy channels (OVCs) in the brownmillerite SrCoO2.5 , a 100-fold improvement in the oxygen reduction kinetics is realized in an epitaxial thin film that has the OVCs open to the surface.
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
authors.forename: Hyoungjeen
authors.initials: H
authors.lastname: Jeen
authors.forename: Zhonghe
authors.initials: Z
authors.lastname: Bi
authors.forename: Woo Seok
authors.initials: WS
authors.lastname: Choi
authors.forename: Matthew F
authors.initials: MF
authors.lastname: Chisholm
authors.forename: Craig A
authors.initials: CA
authors.lastname: Bridges
authors.forename: M Parans
authors.initials: MP
authors.lastname: Paranthaman
authors.forename: Ho Nyung
authors.initials: HN
authors.lastname: Lee
keywords: brownmillerite; oxygen reduction reaction; pulsed laser epitaxy; solid oxide fuel cells; strontium cobaltite