Kim Sangtae, Avila-Paredes Hugo J, Wang Shizhong, Chen Chien-Ting, De Souza Roger A, Martin Manfred, Munir Zuhair A
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA.
Phys Chem Chem Phys. 2009 May 7;11(17):3035-8. doi: 10.1039/b901623f. Epub 2009 Mar 2.
In this communication we elucidate a microstructural picture of proton conduction in nano-crystalline yttria-stabilized zirconia at low temperatures (Kim et al. Adv. Mater., 2008, 20, 556). Based on careful analysis of electrical impedance spectra obtained from samples with grain sizes of approximately 13 and approximately 100 nm under both wet and dry atmospheres over a wide range of temperatures (room temperature-500 degrees C), we were able to identify the pathway for proton conduction in this material. It was found that the grain boundaries in nano-crystalline yttria-stabilized zirconia are highly selective for ion transport, being conductive for proton transport but resistive for oxygen-ion transport.
在本通讯中，我们阐明了纳米晶氧化钇稳定氧化锆在低温下质子传导的微观结构图像（Kim等人，《先进材料》，2008年，20卷，556页）。通过仔细分析在室温和500摄氏度的宽温度范围内，在潮湿和干燥气氛下从晶粒尺寸约为13纳米和约100纳米的样品获得的电阻抗谱，我们能够确定这种材料中质子传导的途径。结果发现，纳米晶氧化钇稳定氧化锆中的晶界对离子传输具有高度选择性，对质子传输具有导电性，但对氧离子传输具有电阻性。
