采用甘氨酸-硝酸盐法(GNP)制备中温固体氧化物燃料电池(IT-SOFC)GdBaCo2O5+δ(GBCO)阴极材料, 探索甘氨酸与金属阳离子摩尔比(G/M)等合成条件对产物性能的影响, 研究了GBCO的微观形貌、晶体结构、电导率和电化学性能. 结果表明, G/M为3.0的阴极粉料(GBCO-3.0)颗粒细小均匀且比表面积大, G/M在2.5~3.5之间制备的粉料经1000℃煅烧5 h可形成结晶度高的GBCO纯相. 阴极材料GBCO与电解质材料Sm0.2Ce0.8O1.9(SDC)在1100℃混合煅烧, 未发生明显的化学反应. 在500~800℃范围内, GBCO阴极的电导率均大于100 S/cm. 1050℃煅烧的GBCO-3.0阴极的极化电阻(Rp)最小, 750℃为0.125 Ω·cm2.
GdBaCo2O5+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 Sm0.2Ce0.8O1.9 (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 (RP) of 0.125 Ω·cm2 at 750℃.
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