Effect of cobalt content on electrochemical performance for La0.6Sr0.4CoxFe1-xO3-δ and BaZr0.8Yb0.2O3-δ composite cathodes in protonic ceramic fuel cells. Issue 12 (15th June 2023)

• Record Type: Journal Article
• Authors: Watanabe, Konosuke; Yamaguchi, Yuki; Nomura, Katsuhiro; Sumi, Hirofumi; Mori, Masashi; Mizutani, Yasunobu; Shimada, Hiroyuki
• Is Part Of: Ceramics international. Volume 49:Issue 12(2023)
• Page Start: 21085
• Page End: 21090
• Publication Date: 2023-06-15
• Subjects: Protonic ceramic fuel cells (PCFC) -- Composite cathode -- Cobalt -- Perovskite -- BaZr0.8Yb0.2O3-δ (BZYb); PCFC protonic ceramic fuel cell -- BZYb BaZr0.8Yb0.2O3−δ -- LSCF La0.6Sr0.4Co0.2Fe0.8O3–δ -- LSC La0.6Sr0.4CoO3–δ -- LSF La0.6Sr0.4FeO3–δ -- SOFC solid oxide fuel cell -- XRD X-ray diffraction -- SEM scanning electron microscopy -- EIS electrochemical impedance spectroscopy -- OCV open-circuit voltage -- MPD maximum power density -- ASR area-specific resistance -- TEC thermal expansion coefficient; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.03.105
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This study compares the electrochemical performance of the composite cathodes of La0.6 Sr0.4 Cox Fe1-x O3- δ and BaZr0.8 Yb0.2 O3- δ (BZYb) sintered at 900 and 1100 °C in anode-supported protonic ceramic fuel cells (PCFCs) using a BZYb electrolyte. For materials composited with BZYb, La0.6 Sr0.4 Co0.2 Fe0.8 O3– δ (LSCF), La0.6 Sr0.4 CoO3– δ (LSC), and La0.6 Sr0.4 FeO3– δ (LSF) were used. The composite cathodes sintered at 1100 °C showed higher performance than those sintered at 900 °C, because the number and thickness of proton conductive network paths of BZYb within the composite cathodes increase with increasing sintering temperature. The PCFCs with LSCF-BZYb, LSC-BZYb, and LSF-BZYb composite cathodes exhibit power densities of 0.25, 0.19, and 0.07 W cm −2, respectively, at an operating temperature of 600 °C. The polarization resistance of the Co-free LSF-BZYb composite cathodes is originally higher than those of the Co-containing LSC-BZYb and LSCF-BZYb cathodes, suggesting that Co plays an important role in obtaining high catalytic activity for cathode reactions in PCFCs as well as conventional solid oxide fuel cells.