Preparation and Characterization of Pr2-xSrxCoO4+δ Cathode Materials for IT-SOFC

doi:10.3724/SP.J.1077.2010.00738

Abstract

Abstract:

The samples of Pr_2-xSr_xCoO_4+δ(x=0.8, 1.0, 1.2) as cathode material for intermediate-temperature solid oxide fuel cell (IT-SOFC) were synthesized by solid-state reaction. Crystal structure, thermal expansion, electrical conductivity and electrochemical properties were investigated by XRD, SEM, dilatometry, DC four-probe method, AC impedance and cyclic voltammetry (CV) techniques, respectively. The XRD results showed all the samples obtained as a single K₂NiF₄-structural phase, there were no chemical reaction occurred between the Pr_0.08Sr_1.2CoO_4+δelectrode and the Sm_0.2Ce_0.8O_1.9 (SDC) electrolyte at 1100℃ in air. The thermal expansion coefficients (TECs) increased with Sr content increasing. The electrical conductivity of the specimens was over 100S/cm at 800℃. The polarization resistance decreased with the increasing of Sr content. Pr_0.8Sr_1.2O_4+δ had the optimum value of 0.29Ω·cm² at 700℃ in air.

Key words: SOFC, cathode, thermal expansion, electrical conductivity, electrochemical properties

CLC Number:

TM911

CAO Yue, GU Hai-Tao, CHEN Han, ZHENG Yi-Feng, ZHOU Ming, GUO Lu-Cun. Preparation and Characterization of Pr_2-xSr_xCoO_4+δ Cathode Materials for IT-SOFC[J]. Journal of Inorganic Materials, 2010, 25(7): 738-742.

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Preparation and Characterization of Pr_2-xSr_xCoO_4+δ Cathode Materials for IT-SOFC

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