SrCo1−yTiyO3−δ as potential cathode materials for intermediate-temperature solid oxide fuel cells
SrCo1−yTiyO3−δ as potential cathode materials for intermediate-temperature solid oxide fuel cells
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DOI：
10.1016/j.jpowsour.2011.04.025
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发表时间：
2011-09
影响因子：
9.2
通讯作者：
Yu Shen;F. Wang;X. Ma;T. He
中科院分区：
文献类型：
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作者：
Yu Shen;F. Wang;X. Ma;T. He
以La0.9Sr0.1Ga0.8Mg0.2O3−δ(LSGM)电解质为基础，合成了SrCo1−yTiyO3−δ(SCTy,y= 0.00-0.20)钙钛矿，并对其作为中温固体氧化物燃料电池（IT-SOFCs）的潜在正极材料进行了评价。y≥0.05的scty复合材料采用立方钙钛矿结构，在空气中热稳定性为30℃~ 1000℃。相对于未掺杂的SrCoO3−δ， Ti的取代显著提高了scty复合材料的导电性。样品y= 0.05的最高电导率在300 ~ 800℃的空气中变化范围为430 ~ 160 S cm - 1。750℃时，随着Ti含量的增加，scty阴极在LSGM电解液上的面积比电阻从0.084 Ω cm2aty= 0.05逐渐增大到0.091 Ω cm2aty= 0.20。在300 μm厚的LSGM电解液上使用y= 0.05, 0.10, 0.15和0.20的scty阴极，在800°C时，单体电池的峰值功率密度分别为793,608,525和425 mW cm - 2。这些新型的SCTycubic钙钛矿在IT-SOFC阴极中显示出相当大的应用潜力。
The perovskites SrCo1−yTiyO3−δ(SCTy,y= 0.00–0.20) are synthesized and assessed as potential cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) based on the La0.9Sr0.1Ga0.8Mg0.2O3−δ(LSGM) electrolyte. SCTycomposites withy≥ 0.05 adopt a cubic perovskite structure with thermal stability between 30 °C and 1000 °C in air. Substitution of Ti significantly enhances the electrical conductivity of the SCTycomposites relative to the undoped SrCoO3−δ. The highest electrical conductivity of the sample withy= 0.05 varied from 430 S cm−1to 160 S cm−1between 300 °C to 800 °C in air. The area-specific resistances of the SCTycathodes on the LSGM electrolyte gradually increase from 0.084 Ω cm2aty= 0.05 to 0.091 Ω cm2aty= 0.20 with increasing Ti content at 750 °C. Single-cells that used SCTycathodes withy= 0.05, 0.10, 0.15, and 0.20 on a 300 μm-thick LSGM electrolyte achieve peak power densities of 793, 608, 525, and 425 mW cm−2at 800 °C, respectively. These novel SCTycubic perovskites demonstrate considerable potential for application in IT-SOFC cathodes.