Journal Published Online: 21 August 2015
Volume 44, Issue 4

Terbium-Doped SrCoO as a New Cathode Material for IT–SOFC

CODEN: JTEVAB

Abstract

Cathode materials consisting of Sr1–xTbxCoO3–δ (x = 0.1, 0.2, 0.3) were prepared from a stoichiometric mixture of SrCO3, Co3O4, and Tb4O7 for intermediate-temperature solid oxide fuel cells (IT–SOFCs). The crystal structure of Sr0.9Tb0.1CoO3–δ was defined in the cubic Pm–3 m space group (No. 221), and Sr0.8Tb0.2CoO3–δ and Sr0.7Tb0.3CoO3–δ had a tetragonal I4/mmm structure. The electrical conductivity values were all higher than 407 S · cm−1 for T ≥ 500°C. The area specific resistances (ASRs) and its activation energy (Ea) increased with increasing x. The oxygen vacancies and the thermal expansion coefficients (TECs) decreased with increasing x. The TECs were influenced by the concentration of oxygen vacancies and the transition of the Co3+ ions from a low-spin to a high-spin state. The cathodes exhibited porosity microstructure and good adhesion to solid electrolyte. Sr0.9Tb0.1CoO3–δ had the best cathode characteristics and the most stable performance.

Author Information

Ma, Pengcheng
School of Materials and Metallurgy, Northeastern Univ., Shenyang, CN
Liu, Tao
School of Materials and Metallurgy, Northeastern Univ., Shenyang, CN
Yu, Jingkun
School of Materials and Metallurgy, Northeastern Univ., Shenyang, CN
Pages: 8
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20140536
ISSN: 0090-3973
DOI: 10.1520/JTE20140536