Synthesis and properties of Ba{sub 0.5}Sr{sub 0.5}(Co{sub 0.6}Zr{sub 0.2})Fe{sub 0.2}O{sub 3-{delta}} perovskite cathode material for intermediate temperature solid-oxide fuel cells

Journal Article · Wed Jun 03 04:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2008.12.015· OSTI ID:22029778

Xiuxia, Meng; Bo, Meng ^[1]; Naitao, Yang; Zifeng, Ma ^[2]

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1. School of Chemical Engineering, Shandong University of Technology, Zibo, 255049 (China)
2. Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 (China)

A highly stable perovskite cathode material, Ba{sub 0.5}Sr{sub 0.5}(Co{sub 0.6}Zr{sub 0.2})Fe{sub 0.2}O{sub 3-{delta}} (BSCZF) for intermediate temperature solid-oxide fuel cells (IT-SOFCs) was synthesized via the improved EDTA-citric acid complexing technique combined with high-temperature sintering. The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectra (EIS) measurements. An electrolyte-supported BSCZF/SDC/Ni-SDC fuel cell was fabricated to evaluate the performance of the material. The XRD study indicates that the sintering temperature higher than 950 deg. C is sufficient to the formation of clean single BSCZF perovskite phase. Due to the incorporation of Zr ions, BSCZF perovskite exhibit lower electrical conductivity with higher activation energy but higher structural stability than the Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.2}O{sub 3-{delta}} (BSCF) parent oxide. The maximum electrical conductivity of BSCZF attains 16.9 S cm{sup -1} at around 540 deg. C. Impedance spectra showed that the ASRs of BSCZF cathode on samaria doped ceria (Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9}, SDC) electrolyte are low but are still slightly larger than those of BSCF at similar conditions. The BSCZF/SDC/Ni-SDC cell exhibited a stable output with the maximum power densities of 30, 75, 139 and 241 mW cm{sup -2} at 550, 600, 650 and 700 deg. C, respectively. Due to the high electrochemical performances as well as the excellent stability, BSCZF perovskite may be an attractive cathode material for IT-SOFCs.

• OSTI ID: 22029778
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 6 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
CATHODES
CERIUM OXIDES
CITRIC ACID
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
PEROVSKITE
POWER DENSITY
SCANNING ELECTRON MICROSCOPY
SOLID OXIDE FUEL CELLS
STABILITY
SYNTHESIS
X-RAY DIFFRACTION