Beneficial Effect of Surface Decorations on the Surface Exchange of Lanthanum Strontium Ferrite and Dual Phase Composites

Simona Ovtar, Martin Søgaard, Jia Song, Peter Vang Hendriksen

Research output: Contribution to journalConference abstract in journalResearchpeer-review

190 Downloads (Pure)

Abstract

Perovskites within the (La,Sr)(Fe,Co)O3 class of materials show variations in the oxygen stoichiometry depending on temperature and oxygen activity and can potentially be used as catalysts, electrodes in high-temperature solid oxide fuel cells, gas sensors or for oxygen transport membranes. These perovskites possess a mixed ionic and electronic conductivity (MIEC), which can be highly beneficial for the processes on oxygen electrode surfaces. The oxygen transport through a MIEC is determined by the rate of the oxygen exchange over the gas-solid interface and the diffusivity of oxide ions and electrons (or holes) in the bulk. The oxygen exchange process over the surface in general involves several reaction steps, O2 adsorption, dissociation, charge transfer and incorporation of ionic species. The Co-free end member of the material class; LSF (e.g. (La0.6Sr0.4FeO3-δ) is fairly low cost and chemically stable in both mildly reducing and oxidizing atmosphere. The electronic conductivity is excellent (283 S/cm at 800 °C) but the ionic conductivity especially at low temperature is limited (0.014 S/cm, 800 °C). Due to these properties the material is a candidate for use in composite membranes in combination with a better ionic conducting material like CGO. Such systems are also excellent model systems for fundamental studies of the oxygen exchange process
Original languageEnglish
JournalElectrochemical Society. Meeting Abstracts (Online)
VolumeMA2016-02
ISSN2151-2043
Publication statusPublished - 2016
EventPRiME 2016/230th ECS Meeting - Honolulu, United States
Duration: 2 Oct 20167 Oct 2016
http://prime-intl.org/

Conference

ConferencePRiME 2016/230th ECS Meeting
CountryUnited States
CityHonolulu
Period02/10/201607/10/2016
Internet address

Fingerprint

Dive into the research topics of 'Beneficial Effect of Surface Decorations on the Surface Exchange of Lanthanum Strontium Ferrite and Dual Phase Composites'. Together they form a unique fingerprint.

Cite this