Synthesis and Characterization of GdBaCo2O5+δ Cathode Material by Glycine-nitrate Process

doi:10.3724/SP.J.1077.2012.11488

Abstract

Abstract: GdBaCo₂O_5+δ (GBCO) powders were synthesized by the glycine-nitrate process (GNP) with different glycine/metal ratios (G/M) and characterized as cathode material for intermediate temperature solid oxide fuel cell(IT-SOFC). The effects of G/M ratios on the performance and properties of GBCO electrodes including the morphology, crystal structure, electrical conductivity and electrochemical properties were evaluated. The GBCO powder synthesized at G/M ratio of 3.0 (GBCO-3.0) showed the highest specific surface area. XRD results proved that the precursor powders calcined at 1000℃ for 5 h formed GBCO single-phase when the ratio of glycine to metal was in the range of 2.5–3.5. There were no chemical reaction occurred between the GBCO cathode and the Sm_0.2Ce_0.8O_1.9 (SDC) electrolyte after calcination at 1100℃. The electrical conductivities of all GBCO cathodes were over 100 S/cm at intermediate temperature (500–800℃). The GBCO-3.0 cathode calcined at 1050℃ exhibited the lowest polarization resistance (R_P) of 0.125 Ω·cm² at 750℃.

Key words: GdBaCo₂O_5+δ, electrical conductivity, electrochemical performance, glycine-nitrate process, cathode

CLC Number:

TM911

JIN Hong-Jian, WANG Huan, ZHANG Hua, JIN Jiang. Synthesis and Characterization of GdBaCo₂O_5+δ Cathode Material by Glycine-nitrate Process[J]. Journal of Inorganic Materials, 2012, 27(7): 751-756.

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Synthesis and Characterization of GdBaCo₂O_5+δ Cathode Material by Glycine-nitrate Process

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