title: Origin and Tunability of Unusually Large Surface Capacitance in Doped Cerium Oxide Studied by Ambient-Pressure X-Ray Photoelectron Spectroscopy.
abstract: The volumetric redox (chemical) capacitance of the surface of CeO2-δ films is quantified in situ to be 100-fold larger than the bulk values under catalytically relevant conditions. Sm addition slightly lowers the surface oxygen nonstoichiometry, but effects a 10-fold enhancement in surface chemical capacitance by mitigating defect interactions, highlighting the importance of differential nonstoichiometry for catalysis.
authors.affiliation: Department of Materials Science and Engineering, Stanford University, 496 Lomita Mall, Stanford, CA, 94305, USA.
authors.forename: Chirranjeevi Balaji
authors.initials: CB
authors.lastname: Gopal
authors.affiliation: Sandia National Laboratories, Livermore, CA, 94550, USA.
authors.forename: Farid El
authors.initials: FE
authors.lastname: Gabaly
authors.affiliation: Sandia National Laboratories, Livermore, CA, 94550, USA.
authors.forename: Anthony H
authors.initials: AH
authors.lastname: McDaniel
authors.affiliation: Department of Materials Science and Engineering, Stanford University, 496 Lomita Mall, Stanford, CA, 94305, USA.|Sandia National Laboratories, Livermore, CA, 94550, USA.|Stanford Institute of Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA.
authors.forename: William C
authors.initials: WC
authors.lastname: Chueh
keywords: catalysis; ceria; interfacial; nonstoichiometry; redox