Synthesis and assessment of la0.8Sr0.2Sc yMn1-yO3-δ as cathodes for solid-oxide fuel cells on scandium-stabilized zirconia electrolyte

Hongxia Gu, Yao Zheng, Ran Ran, Zongping Shao, Wanqin Jin, Nanping Xu, Jeongmin Ahn

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Perovskite-type La0.8Sr0.2ScyMn 1-yO3-δ oxides (LSSMy, y=0.0-0.2) were synthesized and investigated as cathodes for solid-oxide fuel cells (SOFCs) containing a stabilized zirconia electrolyte. The introduction of Sc3+ into the B-site of La0.8Sr0.2MnO3-δ (LSM) led to a decrease in the oxides' thermal expansion coefficients and electrical conductivities. Among the various LSSMy oxides tested, LSSM0.05 possessed the smallest area-specific cathodic polarization resistance, as a result of the suppressive effect of Sc3+ on surface SrO segregation and the optimization of the concentration of surface oxygen vacancies. At 850°C, it was only ∼0.094Ωcm2 after a current passage of 400mA cm-2 for 30 min, significantly lower than that of LSM (∼0.25 Ω cm2). An anode-supported cell with a LSSM0.05 cathode demonstrated a peak power density of 1300mWcm-2 at 850°C. The corresponding value for the cell with LSM cathode was 450mWcm-2 under the same conditions. The LSSM0.05 oxide may potentially be a good cathode material for IT-SOFCs containing doped zirconia electrolytes.

Original languageEnglish (US)
Pages (from-to)471-478
Number of pages8
JournalJournal of Power Sources
Volume183
Issue number2
DOIs
StatePublished - Sep 1 2008

Keywords

  • Cathode
  • LaSrScMnO
  • Solid-oxide fuel cell
  • Stabilized zirconia

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Synthesis and assessment of la<sub>0.8</sub>Sr<sub>0.2</sub>Sc <sub>y</sub>Mn<sub>1-y</sub>O<sub>3-δ</sub> as cathodes for solid-oxide fuel cells on scandium-stabilized zirconia electrolyte'. Together they form a unique fingerprint.

  • Cite this