摘要
采用固相反应法制备了中温固体氧化物燃料电池阴极材料Sm0.5-xGdxSr0.5CoO3-δ(SGSC),用溶胶-凝胶法制备了Ce0.9Gd0.1O1.95(GDC)电解质粉体。用X射线衍射仪、热膨胀仪及交流阻抗谱法分别对SGSC材料的结构、化学稳定性、热膨胀性质及SGSC/30%GDC阴极的电化学性能进行了研究。结果表明,经1100℃焙烧6 h的SGSC粉体均形成单相正交钙钛矿结构,SGSC与GDC电解质在高温下具有良好的化学相容性。随着Gd3+含量的增加,材料的热膨胀系数无规律性变化,极化电阻先减小后增加,在x=0.15时,以SGSC/30%GDC为复合阴极的极化电阻最小,750℃时,Rp=0.03Ω.cm2。
Abstract： The samples of Sm（0.5-x）GdxSr（0.5）CoO（3-δ）（x =0, O. 05,0.10,0.15,0.20） as cathode material for intermediate -temperature solid oxide fuel cell （IT- SOFC） and Ce0.9 Gd0 01. 95 （GDC）electrolyte were synthesized by solid -state reac- tion and gel combustion method, respectively. The phase composition, chemical stability and thermal expansion of Sm0.5- GdxSro.5 CO3-8 were investigated by XRD and dilatometry. The electrochemical performance of the SGSC -30% GDC compos- ite cathode was determined by ac impedance spectroscopy. The XRD results show that the phase of samples that calcined at 1100℃ for 6h is orthorhombic perevskite, there are no chemical reaction occurred between the SGSC and the Ceo.9Gdo. iOi.95 （GDC）electrelyte at 1100℃ in air. The mean thermal expansion coefficients （TECs） ＇value of sintered sample are at range of 16.13 × 18.78 × 10- 6℃, which presented unclear change with Gd3＋ content increasing. The polarization resistance de- creased with the incre.asing of Gd3＋ content, and had the optimum value of O. 0311 × cm2 at 750℃ in air.
出处
《稀土》
EI
CAS
CSCD
北大核心
2013年第4期30-34,共5页
Chinese Rare Earths
基金
内蒙古科技大学创新基金(2010NC020)
内蒙古自然科学基金(2010ZD04)
作者简介
周芬（1973-），女，江苏徐州人，副教授，主要从事混合导体材料及器件的研究。
