Preparation and Electrochemical Performance of Cobalt-free Cathode Material Ba0.5Sr0.5Fe0.9Nb0.1O3-δ for Intermediate-temperature Solid Oxide Fuel Cells

doi:10.1007/s40242-014-4130-y

Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (5): 806-810.doi: 10.1007/s40242-014-4130-y

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Preparation and Electrochemical Performance of Cobalt-free Cathode Material Ba_0.5Sr_0.5Fe_0.9Nb_0.1O_3-δ for Intermediate-temperature Solid Oxide Fuel Cells

LONG Wen, XU Huawei, HE Tianmin

Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, P. R. China

Received:2014-04-09 Revised:2014-05-23 Online:2014-10-01 Published:2014-06-03
Contact: HE Tianmin E-mail:hetm@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.10974065) and the Applied Basic Research Programs of Science and Technology Development of Jilin Province, China(No.20130102011JC).

Abstract

Abstract:

Perovskite oxide Ba_0.5Sr_0.5Fe_0.9Nb_0.1O_3-δ(BSFN) as a cobalt-free cathode for intermediate-temperature solid oxide fuel cells(IT-SOFCs) on the Ce_0.8Sm_0.2O_1.9(SDC) and La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-_δ(LSGM) electrolytes was prepared and investigated. The single phase BSFN oxide with a cubic perovskite structure and relatively high electrical conductivities was obtained after sintering at 1250℃ for 10 h in air. The BSFN cathode exhibited excellent chemical stability on the SDC and LSGM electrolytes at temperatures below 950℃. The area specific resistance of the BSFN cathode on the SDC and LSGM electrolytes were 0.024 and 0.021 Ω·cm² at 800℃, respectively. The maximum power densities of the single cell with BSFN cathode in 300 μm-thick SDC and LSGM electrolytes achieved 414 and 516 mW/cm² at 800℃, respectively. These results show that the BSFN material is a promising cobalt-free cathode candidate to be used in IT-SOFCs. A combination of the BSFN cathode and LSGM electrolyte is preferred owing to its excellent electrochemical performance.

Key words: Solid oxide fuel cell, Cathode, Phase formation, Chemical stability, Electrochemical performance

LONG Wen, XU Huawei, HE Tianmin. Preparation and Electrochemical Performance of Cobalt-free Cathode Material Ba_0.5Sr_0.5Fe_0.9Nb_0.1O_3-δ for Intermediate-temperature Solid Oxide Fuel Cells[J]. Chemical Research in Chinese Universities, 2014, 30(5): 806-810.

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Preparation and Electrochemical Performance of Cobalt-free Cathode Material Ba_0.5Sr_0.5Fe_0.9Nb_0.1O_3-δ for Intermediate-temperature Solid Oxide Fuel Cells

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