Epitaxial and polycrystalline gadolinia-doped ceria cathode interlayers for low temperature solid oxide fuel cells

Young Beom Kim, Joon Hyung Shim, Turgut M. Gr, Fritz B. Prinz

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

This paper presents the catalytic role of the gadolinia-doped ceria (GDC) and its surface grain boundaries in enhancing the oxygen incorporation kinetics of low-temperature solid oxide fuel cells (LT-SOFC). Epitaxial and polycrystalline GDC thin films were grown by pulsed laser deposition (PLD) on the cathode side of 300 m-thick single crystalline (100) and 100 m-thick polycrystalline YSZ substrates, respectively. Fuel cell current-voltage behavior and electrochemical impedance spectroscopy measurements were carried out in the temperature range of 350C-450C on both types of cells. Results of dc and ac measurements confirm that cathodic resistances of cells with epitaxial GDC layer are lower than that for the YSZ-only control cell. This is attributed to the higher surface exchange coefficient for GDC than YSZ. Moreover, the role of grain boundary density at the cathode side external surface was investigated on surface-engineered electrode-membrane assemblies (MEA) having different GDC surface grain sizes. MEAs having smaller surface grain size show better cell performance and correspondingly lower electrode interfacial resistance. Electrochemical measurements suggest that GDC grain boundaries at the cathode side contribute to enhance oxygen surface kinetics. These results provide an opportunity and a microstructure design pathway to improve performance of LT-SOFCs by surface engineering with nano-granular, catalytically superior thin GDC cathodic interlayers.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume158
Issue number11
DOIs
Publication statusPublished - 2011 Oct 18

Fingerprint

Gadolinium
Cerium compounds
solid oxide fuel cells
gadolinium
Solid oxide fuel cells (SOFC)
interlayers
Cathodes
cathodes
yttria-stabilized zirconia
Temperature
Grain boundaries
grain boundaries
cells
grain size
Oxygen
Electrodes
Kinetics
electrodes
gadolinium oxide
kinetics

ASJC Scopus subject areas

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

Cite this

Epitaxial and polycrystalline gadolinia-doped ceria cathode interlayers for low temperature solid oxide fuel cells. / Kim, Young Beom; Shim, Joon Hyung; Gr, Turgut M.; Prinz, Fritz B.

In: Journal of the Electrochemical Society, Vol. 158, No. 11, 18.10.2011.

Research output: Contribution to journalArticle

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