Interplay of grain size dependent electronic and ionic conductivity in electrochemical polarization studies on Sr-doped LaMnO3 (LSM) thin film cathodes

Tobias M. Huber, Edvinas Navickas, Kazunari Sasaki, Bilge Yildiz, Herbert Hutter, Harry Tuller, Juergen Fleig

Research output: Contribution to journalArticle

Abstract

Many efforts are being made to tune perovskite thin film cathodes toward improving their oxygen reduction kinetics and thereby improving overall solid oxide fuel cell performance. One approach is to enhance oxygen diffusion via introduction of larger concentrations of grain boundaries during thin film growth. While such grain boundary engineering has been shown to enhance ionic transport and surface reaction kinetics in some cases, little attention has been paid on its corresponding influence on electronic conductivity. To provide insights into the role of grain boundaries and their contribution to the cathode performance, we have investigated separately the electronic and ionic conductivity of La0.8Sr0.2MnO3 (LSM) thin films by Van-der-Pauw and 18O tracer exchange measurements respectively, as well as their combined contributions by electrochemical impedance spectroscopy. All three types of experiments were performed on the same kind of samples with varying LSM microstructure to illustrate the effects of grain boundaries on both electron and ion conduction. Correlations between active electrode area and microstructure-dependent partial conductivities are presented. The findings can also be used for optimizing current collector spacing in thin film solid oxide fuel cells.

Original languageEnglish
Pages (from-to)F702-F709
JournalJournal of the Electrochemical Society
Volume165
Issue number9
DOIs
Publication statusPublished - Jan 1 2018

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Ionic conductivity
Grain boundaries
Cathodes
Polarization
Thin films
Solid oxide fuel cells (SOFC)
Oxygen
Microstructure
Surface reactions
Film growth
Electrochemical impedance spectroscopy
Reaction kinetics
Perovskite
Ions
Electrodes
Kinetics
Electrons
Experiments

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Interplay of grain size dependent electronic and ionic conductivity in electrochemical polarization studies on Sr-doped LaMnO3 (LSM) thin film cathodes. / Huber, Tobias M.; Navickas, Edvinas; Sasaki, Kazunari; Yildiz, Bilge; Hutter, Herbert; Tuller, Harry; Fleig, Juergen.

In: Journal of the Electrochemical Society, Vol. 165, No. 9, 01.01.2018, p. F702-F709.

Research output: Contribution to journalArticle

Huber, Tobias M. ; Navickas, Edvinas ; Sasaki, Kazunari ; Yildiz, Bilge ; Hutter, Herbert ; Tuller, Harry ; Fleig, Juergen. / Interplay of grain size dependent electronic and ionic conductivity in electrochemical polarization studies on Sr-doped LaMnO3 (LSM) thin film cathodes. In: Journal of the Electrochemical Society. 2018 ; Vol. 165, No. 9. pp. F702-F709.
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