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作 者:佟泽[1] 尹屹梅[1] 殷洁炜[1] 马紫峰[1]
出 处:《电化学》2013年第3期210-214,共5页Journal of Electrochemistry
基 金:国家自然科学基金(No.21173147);上海市自然科学基金(No.09ZR1413900)资助项目资助
摘 要:制备了一种适用于中温固体氧化物燃料电池的新型两相复合电解质钐掺杂二氧化铈SDC-(Li/Na)2SO4.使用XRD和SEM表征该复合电解质的物相结构和观察电解质片的截面形貌,交流阻抗法测量其400oC~700oC的电导率.结果表明,SDC-(Li/Na)2SO4由结晶相SDC和无定形相(Li/Na)2SO4组成.在中温范围(500oC-700oC)该复合电解质电导率比SDC显著增大并随温度升高呈三段变化:T<500oC,表观离子传导活化能为1.28 eV;500oC~550oC第二相硫酸盐融化,电导率激增;T≥550oC,电导率又缓慢增加,活化能降为0.30 eV,与SDC和文献报道的SDC-(Li/Na)2CO3相比,其电导率均显著提高,如550oC时SDC-(Li/Na)2SO4的电导率可达0.217 S·cm-1,分别为SDC和SDC-(Li/Na)2CO3的25倍和3.2倍.硫酸盐的熔融改变了离子在电解质中的传导机制,显著提高了SDC-(Li/Na)2SO4复合电解质的中温电导率.A novel composite electrolyte SDC-(Li/Na)2SO4 was prepared for intermediate temperature solid oxide fuel cells(ITSOFC).The phase structure and cross-sectional morphology were examined by XRD and SEM,respectively,and the ionic conductivity was investigated by AC impedance in a temperature range of 400 oC - 700 oC in air.It was found that the composite electrolyte was composed of two phases: crystal SDC and amorphous(Li/Na)2SO4.The conductivity of the composite electrolyte was significantly larger than that of SDC at intermediate temperatures(550 oC - 700oC) and increased with temperature in three stages: 1) T 500 oC,the apparent activation energy of ionic transport was 1.28 eV;2) In the range of 500 oC ~ 550 oC,the ionic conductivity rapidly increased due to the melting of sulfate;3) T550 oC,the conductivity slowly raised with temperature,the activation energy decreased significantly to 0.30 eV,and the values of the conductivity of SDC-(Li/Na)2SO4were notabily higher than those of SDC and previously reported SDC-(Li/Na)2CO3.For example,the conductivity of SDC-(Li/Na)2SO4 was 0.217 S.cm-1 at 550 oC,which was 25 times higher than that of SDC and 3.2 times higher than that of SDC-(Li/Na)2CO3.The results indicate that the ionic conducting mechanism changes in composite electrolyte due to the melting of the sulfate second phase,and the diffusion and transmission of ions are accelerated.
关 键 词:复合电解质 固体氧化物燃料电池 钐掺杂二氧化铈 电导率
分 类 号:TM911.4[电气工程—电力电子与电力传动]
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