摘要
具钙钛矿结构的Na0.5Bi0.49Ti0.98Mg0.02O3-δ材料（NBTMg-4902）因其在较低温度（400~700℃）范围内具有高氧离子电导率,被认为是一种极具潜力的中低温固体氧化物燃料电池（IT-SOFC）电解质材料,然而对该材料在操作温度范围内的热化学稳定性尚未有充分的研究。本工作通过X射线衍射、电子扫描显微镜及差热/热重联合分析仪等研究了NBTMg-4902材料在还原气氛环境下的化学稳定性以及该材料与几种SOFC阴极材料的热化学相容性,结果表明：NBTMg在还原气氛下（5%H2/95%N2）极易被分解还原生成金属铋;另外,其与阴极材料（LSC及BSCF）在热处理过程中极易发生固相反应,不具备良好的热化学相容性,说明该材料在SOFC应用中具有一定的局限性。
Perovskite materials of Na0.5Bi0.49Ti0.98Mg0.02O3-（NBTMg-4902） have a high ionic conductivity at 400–700 ℃, and they are regarded as a potential electrolyte in the application of intermediate-temperature solid oxide fuel cells（IT-SOFC）. However, its thermo-chemical stability has not been reported yet. For this purpose, this paper investigated its thermo-chemical compatibility with a few common SOFC cathode materials and its own chemical stability in a reduced atmosphere by X-ray diffraction, scanning electron microscopy, and synchronic differential thermal analysis-thermal gravimetry, respectively. The results show that NBTMg-4902 suffers decomposition in a 5%H2/95%N2 atmosphere to produce metallic Bi and it also has a poor thermo-chemical compatibility with common SOFC cathode materials. All these findings indicate its limitation in the application as an effective electrolyte in SOFC.
作者
刘蕴辉
骆锋光
方晓
王运秋
曾杰
闫霞
陈锡勇
LIU Yunhui;LUO Fengguang;FANG Xiao;WANG Yunqiu;ZENG Jie;YAN Xia;CHEN Xiyong(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Nanning 530004,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第6期854-860,共7页
Journal of The Chinese Ceramic Society
基金
广西自然科学基金(2016GXNSFAA380214)
广西教育厅高校科研项目(KY2015YB004)
广西大学“大学生创新创业训练计划”(201610593059)
关键词
钛酸钠铋盐
氧离子导体
热化学稳定性
热相容性
阴极材料
电解质
sodium bismuth titanate
oxide-ion conductor
thermo-chemical stability
thermal compatibility
cathode
electrolyte
