采用固相法合成Ba1-xSrxCo0.7Fe0.2Nb0.1O3-δ(x=0、0.1、0.2、0.3、0.4)阴极材料.利用X射线衍射(XRD)和扫描电子显微镜(SEM)对其结构和微观形貌进行了表征.XRD测试结果表明Ba1-xSrxCo0.7Fe0.2Nb0.1O3-δ样品经1000℃,烧结10h后形成了立方钙钛矿结构.从样品的电镜照片看出样品具有均匀的孔隙率,电解质(Ce0.85Sm0.15O1.925)-阴极(Ba1-xSrxCo0.7Fe0.2Nb0.1O3-δ)之间的界面结合良好.电化学交流阻抗测试结果表明Ba1-xSrxCo0.7Fe0.2Nb0.1O3-δ中掺入Sr可以明显地降低阴极的极化电阻,随着Sr含量的增多,阴极的界面极化电阻(RP)先减少后增大,当Sr的含量x为0.2时Rp值最小.以Ce0.85Sm0.15O1.925(SDC)电解质为支撑体,Ni0.9Cu0.1-SDC为阳极,Ba0.8Sr0.2Co0.7Fe0.2Nb0.1O3-δ为阴极的单电池的最大功率密度在600℃时达到155 mW/cm2.实验结果表明Ba0.8Sr0.2Co0.7Fe0.2Nb0.1O3-δ材料是一种电化学性能较为优良的中温固体氧化物燃料电池阴极材料.
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