Textured Sr₂Sc 0.1 Nb 0.1 Co 1.5 Fe 0.3 O 6-2δ Thin Film Cathodes for IT-SOFCs

Reducing the operating temperature of solid oxide fuel cells (SOFCs) to intermediate (650⁻850 °C) or even lower levels (400⁻650 °C) is an important practical requirement. However, the main obstacle to lowering the operating temperature is the poor oxygen reduction reaction (ORR) activity on the cath...

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Bibliographic Details
Published inMaterials Vol. 12; no. 5
Main Authors Zhu, Zhaoxin, Zhou, Chuan, Zhou, Wei, Yang, Nan
Format Journal Article
LanguageEnglish
Published Switzerland 07.03.2019
Subjects
mixed ionic electronic conductor
surface chemistry
SOFCs
ORR
thin films
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Summary:Reducing the operating temperature of solid oxide fuel cells (SOFCs) to intermediate (650⁻850 °C) or even lower levels (400⁻650 °C) is an important practical requirement. However, the main obstacle to lowering the operating temperature is the poor oxygen reduction reaction (ORR) activity on the cathode side and, therefore, it is essential to explore cathode materials with good ORR activity in these temperature ranges. In this work, we investigated the possibility of using Sr₂Sc Nb Co Fe O (SSNCF) as a suitable intermediate temperature cathode material. SSNCF thin films with different orientations were prepared using the pulsed laser deposition technique, and the relationship of the surface chemical states and ORR activity was discussed in terms of crystallographic orientation. The results showed that the SSNCF/YSZ grown along the [110] direction exhibited superior ORR activity compared to the SSNCF/SDC/YSZ thin film electrode grown along the [100] direction. This was explained by the variation in the Sr-surface enrichment and cobalt ion oxidation state using X-ray photoemission spectroscopy.
ISSN:1996-1944
1996-1944