Investigation of layered perovskite NdBa0.5Sr0.25Ca0.25Co2O5+δ as cathode for solid oxide fuel cells |
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| Authors: | Chuangang Yao Haixia Zhang Xiaojuan Liu Junling Meng Xiong Zhang Fanzhi Meng Jian Meng |
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| Affiliation: | 1. School of New Energy, Bohai University, Jinzhou 121007, PR China;2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;3. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, PR China |
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| Abstract: | Layered perovskite oxides with and without Ca-doped NdBa0.5Sr0.25Ca0.25Co2O5+δ (NBSCaCO) and NdBa0.5Sr0.5Co2O5+δ (NBSCO) are studied to investigate the effects of Ca doping on the crystal structure, thermal behavior, electrical and electrochemical properties. Both NBSCO and NBSCaCO are tetragonal structure with P4/mmm space group. The average thermal expansion coefficient (TEC) value is reduced from 23.3?×?10?6 K?1 to 19.8?×?10?6 K?1 during 30–800?°C. The electrical conductivities are increased by Ca doping. Both electrical conductivities of NBSCO and NBSCaCO are higher than 600?S·cm?1 over 30–800?°C. Substitution of Sr with Ca can effectively improve the electrochemical properties of NBSCaCO. From 650?°C to 800?°C, the area specific resistance (ASR) of NBSCaCO are decreased from 0.62 to 0.062?Ω?cm2 and the corresponding output power density are increased from 258 to 812?mW?cm?2. On the basis of these results, Ca doped layered perovskite NBSCaCO can be a good cathode candidate material for SOFC application. |
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| Keywords: | Solid oxide fuel cell Cathode material Layered perovskite Electrical conductivity Electrochemical performance |
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