Potentiality of cobalt-free perovskite Ba_0.5Sr_0.5Fe_0.9Mo_0.1O_3?¦Ä as a single-phase cathode for intermediate-to-low-temperature solid oxide fuel cells

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• 作者：Yihan Ling ; Xiaozhen Zhang ; Zhenbin Wang ; Songlin Wang ; Ling Zhao ; Xingqin Liu ; Bin Lin
• 关键词：Single-phase cathode ; Intermediate-to-low-temperature solid oxide fuel cells ; Chemically compatible ; Polarization resistance
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：4 November, 2013
• 年：2013
• 卷：38
• 期：33
• 页码：14323-14328
• 全文大小：1153 K

文摘

Cobalt-free perovskite Ba_0.5Sr_0.5Fe_0.9Mo_0.1O_3?¦Ä (BSFMo) was investigated as a single-phase cathode for intermediate-to-low-temperature solid oxide fuel cells (IL-SOFCs). The X-ray diffraction (XRD) Rietveld refinement, electrical conductivity, thermogravimetric (TG) measurements, the phase reaction were investigated. The doping of high-valence Mo cations into Fe-site obviously enhanced the electrical conductivity of BSFMo sample with the maximum value of 174?S?cm^?1. XRD results showed that BSFMo cathode was chemically compatible with the BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3?¦Ä (BZCYYb) electrolyte for temperatures up to 1000?¡ãC. Laboratory-sized tri-layer cells of NiO-BZCYYb/BZCYYb/BSFMo were operated from 550 to 700?¡ãC with humidified hydrogen (¡«3 % H₂O) as fuel and the static air as oxidant, respectively. An open-circuit potential of 1.001?V, the maximum power density of 428?mW?cm^?2, and a low electrode polarization resistance of 0.148?¦¸?cm² were achieved at 700?¡ãC. The experimental results indicated that the single-phase BSFMo is a promising candidate as cathode material for IL-SOFCs.