摘要
对锶镁掺杂镓酸镧 (La0 .9Sr0 .1 Ga0 .8Mg0 .2 O2 .85,简写为LSGM 10 2 0 )固体电解质的电化学性能进行了初步研究 ,并测试了以之为电解质 ,Ni-CeO2 为阳极 ,La(Sr)MnO3为阴极的氢 -氧燃料电池 (SOFC)的伏安特性 .用能谱 (EDAX)分析了测试电池横截面各种元素的分布情况 .结果表明 :得到的LSGM 10 2 0电解质有较高的中温和高温离子电导率 ,在不同的温度范围氧离子迁移数均接近于 1.测试电池的最大输出功率密度和最大电流密度分别为 67.7mW·cm- 2 和 12 6.3mA·cm- 2 .EDAX结果显示 ,作为电解质主元素之一的Ga发生了从电解质到阴极的扩散过程 ,而作为阳极主成分之一的Ni也扩散到了电解质中 .电池材料组份之间的相互扩散过程可能是导致测试电池输出功率和电流密度偏低的主要原因 .可以认为 ,要使LSGM在SOFC中得到更广泛的应用 ,必须改善它的化学稳定性 .
Electrochemical properties of 0.1 mol SrO and 0.2 mol MgO doped LaGaO 3 (LSGM1020) were investigated. The V-I characteristics of a H 2-O 2 solid oxide fuel cell (SOFC), which was made up of LSGM1020, Ni-CeO 2 and La(Sr)MnO 3 as electrolyte, anode and cathode respectively, were studied. EDAX was applied to analyze the distribution of Ni, Ce, Ga and La across the intersection of the SOFC. The results reveal that LSGM1020 has high oxygen_ion conductivity at intermediate and elevated temperatures, with ionic transference number near unity at the testing temperature range. The maximum output power and current density of the testing SOFC are 67.7 mW·cm -2 and 126.3 mW·cm -2 , respectively. EDAX results show that Ga diffused into the cathode and Ni diffused into the electrolyte layer. The inter_diffusion of the cell elements may be a major reason, which resulted in the somewhat low power and current output density of the testing cell. Therefore, to make LaGaO 3 based electrolyte be used widely, its chemical stability at working temperature must be substantially improved.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第3期347-351,共5页
Journal of The Chinese Ceramic Society
