High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition
High proton conduction in grain-boundary-free yttrium-doped barium zirconate films grown by pulsed laser deposition
复制标题
DOI：
10.1038/nmat2837
复制
发表时间：
2010-10-01
期刊：
影响因子：
41.2
通讯作者：
Traversa, Enrico
中科院分区：
文献类型：
--
作者：
Pergolesi, Daniele;Fabbri, Emiliana;Traversa, Enrico
为了广泛使用固体氧化物燃料电池（SOFC），需要将操作温度降低到500-750摄氏度范围内。质子传导氧化物作为用于该目的的电解质材料获得了广泛的兴趣。本文报道了用脉冲激光沉积法在不同单晶衬底上制备BaZr（0.8）Y（0.2）O（3-delta）（BZY）质子导电电解质薄膜。在（100）取向的MgO衬底上获得了高度织构化的外延取向的BZY薄膜，显示出BZY样品有史以来报道的最大质子电导率，在500 ℃时为0.11 S cm（-1）。BZY薄膜的优异结晶质量首次允许在300 ℃以上的大BZY体电导率的实验测量，预期在没有阻挡晶界的情况下。测得的质子电导率也显着大于相同温度范围内的氧离子导体的电导率值，为便携式电源的小型化SOFC的发展开辟了新的潜力。
Reducing the operating temperature in the 500-750 degrees C range is needed for widespread use of solid oxide fuel cells (SOFCs). Proton-conducting oxides are gaining wide interest as electrolyte materials for this aim. We report the fabrication of BaZr(0.8)Y(0.2)O(3-delta) (BZY) proton-conducting electrolyte thin films by pulsed laser deposition on different single-crystalline substrates. Highly textured, epitaxially oriented BZY films were obtained on (100)-oriented MgO substrates, showing the largest proton conductivity ever reported for BZY samples, being 0.11 S cm(-1) at 500 degrees C. The excellent crystalline quality of BZY films allowed for the first time the experimental measurement of the large BZY bulk conductivity above 300 degrees C, expected in the absence of blocking grain boundaries. The measured proton conductivity is also significantly larger than the conductivity values of oxygen-ion conductors in the same temperature range, opening new potential for the development of miniaturized SOFCs for portable power supply.