A novel electronic current-blocked stable mixed ionic conductor for solid oxide fuel cells
A novel electronic current-blocked stable mixed ionic conductor for solid oxide fuel cells
复制标题
DOI：
10.1016/j.jpowsour.2010.07.038
复制
发表时间：
2011
影响因子：
9.2
通讯作者：
Wenping Sun;Yinzhu Jiang;Yanfei Wang;Shumin Fang;Zhiwen Zhu;Wei Liu
中科院分区：
文献类型：
--
作者：
Wenping Sun;Yinzhu Jiang;Yanfei Wang;Shumin Fang;Zhiwen Zhu;Wei Liu
报道了一种新型离子导体BaCe 0.8Sm 0.2O3 −δ-Ce 0.8Sm 0.2O2 −δ（BCS-SDC，重量比1：1）作为固体氧化物燃料电池（SOFC）的电解质材料。采用一步凝胶燃烧法制备了均相的BCS-SDC复合粉体。在复合电解质中，BCS和SDC晶粒互为基体。该复合材料避免了BCS和SDC的典型缺点，在燃料电池条件下不仅显示出比BCS的单相更好的化学稳定性，而且显示出比SDC的单相高得多的开路电压（OCV）。此外，BCS-SDC表现出混合氧离子和质子导电。在湿氢（3%H2O）中，700°C时的总电导率为0.0204Scm− 1，其值与最先进的质子导体BaZr0.1Ce0.7Y0.2O3−δ（BZCY）相当。在700°C下，使用30 μ m厚的BCS-SDC电解质，使用湿H2作为燃料，峰值功率密度达到505 mWcm − 2。在开路条件下，在不同的工作温度下的测试电池的电阻也通过阻抗谱进行了研究。
A novel ionic conductor, BaCe0.8Sm0.2O3−δ–Ce0.8Sm0.2O2−δ(BCS–SDC, weight ratio 1:1), is reported as an electrolyte material for solid oxide fuel cells (SOFCs). Homogeneous BCS–SDC composite powders are synthesized via a one-step gel combustion method. The BCS and SDC crystalline grains play a role as matrix for each other in the composite electrolyte. The composite avoids the typical drawbacks of BCS and SDC, showing not only a better chemical stability than the single phase of BCS but much higher open circuit voltages (OCVs) than the single phase of SDC under the fuel cell conditions. Moreover, BCS–SDC exhibits mixed oxygen ionic and protonic conduction. A total conductivity of 0.0204Scm−1at 700°C is achieved in wet hydrogen (3% H2O), the value of which is comparable with the state-of-the-art proton conductor BaZr0.1Ce0.7Y0.2O3−δ(BZCY). The peak power density achieves 505mWcm−2at 700°C with a 30-μm-thick BCS–SDC electrolyte using wet H2as the fuel. Resistances of the tested cell under open circuit conditions at different operating temperatures are also investigated by impedance spectroscopy.