Preparation and Performance of Cathode Materials Ba1-xSrxCo0.7Fe0.2Nb0.1O3-δ for Intermediate-temperature Solid Oxide Fuel Cells

doi:10.3724/SP.J.1077.2013.13131

Journal of Inorganic Materials ›› 2013, Vol. 28 ›› Issue (11): 1223-1227.DOI: 10.3724/SP.J.1077.2013.13131

• Research Paper • Previous Articles Next Articles

Preparation and Performance of Cathode Materials Ba_1-xSr_xCo_0.7Fe_0.2Nb_0.1O_3-δ for Intermediate-temperature Solid Oxide Fuel Cells

HAN Fei^1,2, LIU Xiao-Mei¹, BI Hai-lin¹, ZHANG Li-Jun¹, PEI Li¹, SU Wen-Hui¹

(1. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, Department of Physics, Jilin University, Changchun 130012, China; 2. Changchun Normal University, Changchun 130032, China)

Received:2013-03-07 Revised:2013-04-04 Published:2013-11-20 Online:2013-10-18
About author:HAN Fei. E-mail:hanhongfei79@163.com
Supported by:
National Natural Science Foundation of China (51272087)

Abstract

Abstract: The Ba_1-xSr_xCo_0.7Fe_0.2Nb_0.1O_3-δ(x=0, 0.1, 0.2, 0.3, 0.4) oxides were synthesized by the conventional solid state reaction process and investigated as a cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). All prepared Ba_1-xSr_xCo_0.7Fe_0.2Nb_0.1O_3-δ(x=0-0.4) powders were sintered at 1000 ℃. X-ray diffraction patterns indicate that all samples have a single phase of cubic perovskite structure. The morphologies of the symmetric cell were characterized by a scanning electron microscope (SEM). The cathode exhibits fine uniform microstructure with appropriate porosity, and shows good bonding and continuous contact with the dense Ce_0.85Sm_0.15O_1.925(SDC) electrolyte pellet. AC impedance spectra based on SDC electrolyte measured at intermediate temperatures show that a cathode Ba_0.8Sr_0.2Co_0.7Fe_0.2Nb_0.1O_3-δ exhibits the best electrochemical performance. The maximum power density of single cell with Ba_0.8Sr_0.2Co_0.7Fe_0.2Nb_0.1O_3-δ cathode, Ni_0.9Cu_0.1-SDC anode and SDC electrolyte is 155 mW/cm² at 600℃. The encouraging results suggest that Ba_0.8Sr_0.2Co_0.7Fe_0.2Nb_0.1O_3-δ is a very promising cathode material for IT-SOFCs.

Key words: solid oxide fuel cell, cathode, Ba_1-xSr_xCo_0.7Fe_0.2Nb_0.1O_3-δ, interfacial polarization resistance

CLC Number:

TQ174

HAN Fei, LIU Xiao-Mei, BI Hai-Lin, ZHANG Li-Jun, PEI Li, SU Wen-Hui. Preparation and Performance of Cathode Materials Ba_1-xSr_xCo_0.7Fe_0.2Nb_0.1O_3-δ for Intermediate-temperature Solid Oxide Fuel Cells[J]. Journal of Inorganic Materials, 2013, 28(11): 1223-1227.

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Preparation and Performance of Cathode Materials Ba_1-xSr_xCo_0.7Fe_0.2Nb_0.1O_3-δ for Intermediate-temperature Solid Oxide Fuel Cells

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