Preparation and Characterization of Sr1-xTbxCoO3-δ (x≤0.3) Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cell

doi:10.3724/SP.J.1077.2013.12057

Abstract

Abstract:

Cathode materials consisting of Sr_1-_xTb_xCoO_3-_δ (STC, x≤0.3) were prepared by solid-state reaction from stoichiometric proportions of SrCO₃, Co₃O₄ and Tb₄O₇. Crystal structure, weight loss processes, electronic conductivity, polarization resistance and cell performance were investigated by XRD, ND, TGA, Van Der Pauw DC four-probe method and electrochemical method, respectively. XRD shows the presence of two structural phases in the series belonging to Pm-3m for Sr_0.9Tb_0.1CoO_3-_δ and I4/mmm for Sr_0.8Tb_0.2CoO_3-_δ and Sr_0.7Tb_0.3CoO_3-_δ. Electronic conductivity measurements show that the conductivities of STC were all higher than 407 S/cm in the temperature range of 500℃ to 800℃. AC impedance measurements in symmetrical cells with LSGM as an electrolyte show that the polarization resistance (R_p) and the activation energy (E_a) increase with increasing Tb content. Sr_0.9Tb_0.1CoO_3-_δ, with the largest concentration of oxygen vacancies exhibits the best cathode characteristics with maximum power density of 836 mW/cm².

Key words: solid oxide fuel cell, cathode, cobaltate perovskites, polarization resistance

CLC Number:

O614

LIU Tao. Preparation and Characterization of Sr_1-_xTb_xCoO_3-_δ (x≤0.3) Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cell[J]. Journal of Inorganic Materials, 2013, 28(2): 212-216.

Figures/Tables 6

Fig. 1 XRD patterns of STC and the Rietveld refinement

Fig. 2 TGA curves of STC recorded in air

Fig. 3 Temperature dependence of the electronic conductivity for STC

Fig. 4 The impedance spectra of the symmetrical cell with the configuration of STC|LSGM|STC at 800℃

Fig. 5 The polarization resistance obtained from impedance spectra at different temperatures

Fig. 6 Electrochemical performance data of STC|LSGM|Ni- GDC at 800℃

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