Impact of Sr-Incorporation on Cr Oxidation and Water Dissociation in La(1– x )SrxCrO3

Kelsey A. Stoerzinger, Yingge Du, Kyuwook Ihm, Kelvin H.L. Zhang, Jun Cai, J. Trey Diulus, Ryan T. Frederick, Gregory S. Herman, Ethan J. Crumlin, Scott A. Chambers

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The oxidation and reduction of metal oxides and their interaction with the environment play a critical role in material stability and the ability to catalyze reactions. The local change in valence and formation of surface adsorbates affect the oxide electronic structure and chemical reactivity, yet are challenging to probe experimentally. In this paper a detailed study of the oxidation and reduction of Cr in the perovskite oxide family of La(1– x )SrxCrO3 using ambient pressure X-ray photoelectron spectroscopy is presented. The incorporation of Sr increases the propensity to oxidize at the surface, leading to the presence of Cr4+ and Cr6+ principally confined to the top unit cell when in equilibrium with O2 gas. These acidic sites are readily reduced to Cr3+ in equilibrium with H2O vapor, and the resultant amount of hydroxyls formed from the dissociation of H2O is directly proportional to the density of surface sites formerly oxidized. The quantification of the redox stability of La(1– x )SrxCrO3 and the relationship between the extent of oxidation, reduction, and hydroxylation with Sr yield important insight into the surface functionality during electrochemical applications.

Original languageEnglish (US)
Article number1701363
JournalAdvanced Materials Interfaces
Issue number6
StatePublished - Mar 23 2018
Externally publishedYes

Bibliographical note

Funding Information:
AP-XPS measurements and analysis were supported for K.A.S. by the Linus Pauling Distinguished Postdoctoral Fellowship at Pacific Northwest National Laboratory (PNNL LDRD 69319) and for J.T.D. and R.T.F. by the Semiconductor Research Corporation (Contract No. 2013-OJ-2438.001). The authors thank Dr. Suntharampillai Thevuthasan for assistance with AP-XPS. Film growth and characterization was supported at PNNL by the U.S. Department of Energy, Office of Science, Division of Materials Sciences and Engineering under Award No. 10122. The PNNL work was performed in the Environmental Molecular Sciences Laboratory (EMSL), a national science user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. PNNL is a multiprogram national laboratory operated for DOE by Battelle. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231.

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • ambient pressure X-ray photoelectron spectroscopy
  • chromium oxides
  • hydroxylation
  • surface oxidation
  • surface reduction


Dive into the research topics of 'Impact of Sr-Incorporation on Cr Oxidation and Water Dissociation in La(1– x )SrxCrO3'. Together they form a unique fingerprint.

Cite this