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Materials 2019, 12(5), 777; https://doi.org/10.3390/ma12050777

Textured Sr2Sc0.1Nb0.1Co1.5Fe0.3O6−2δ Thin Film Cathodes for IT-SOFCs

1,2,3
,
4
,
4,*
and
1,*
1
School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai 201210, China
2
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No.5 Xin Mofan Road, Nanjing 210009, China
*
Authors to whom correspondence should be addressed.
Received: 15 January 2019 / Revised: 19 February 2019 / Accepted: 24 February 2019 / Published: 7 March 2019
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Abstract

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 Sr2Sc0.1Nb0.1Co1.5Fe0.3O6−2δ (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. View Full-Text
Keywords: SOFCs; mixed ionic electronic conductor; ORR; thin films; surface chemistry SOFCs; mixed ionic electronic conductor; ORR; thin films; surface chemistry
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Zhu, Z.; Zhou, C.; Zhou, W.; Yang, N. Textured Sr2Sc0.1Nb0.1Co1.5Fe0.3O6−2δ Thin Film Cathodes for IT-SOFCs. Materials 2019, 12, 777.

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