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ZnO对8YSZ电解质材料的烧结性与电化学性能的影响
作者:江虹 郭瑞松 任建勋  
单位:天津大学先进陶瓷与加工技术教育部重点实验室 贵州广播电视大学理工处  
关键词:烧结性  电导率  氧化钇稳定氧化锆  氧化锌 
分类号:O611.3
出版年,卷(期):页码:2010,38(8):1434-1439
DOI:
摘要:

用机械混合方法,在8%(摩尔分数,下同)Y2O3稳定的ZrO2(8%in mole yttria stabilized zirconia,8YSZ)中添加ZnO量分别为0,1%,2%,3%,4%,在不同温度下常压烧结制备了ZnO:8YSZ电解质。研究了烧结温度和ZnO含量对ZnO:8YSZ样品的烧结性、致密度、弯曲强度和电导率的影响。由ZnO:8YSZ电解质作为支撑组装了单电池,对电池的性能进行测试和评价。结果表明:在8YSZ中添加ZnO能改善8YSZ材料的烧结性,1400℃烧结2h的4%ZnO:8YSZ样品的致密度达99.9%,3%ZnO:8YSZ样品的弯曲强度超过200MPa,获得明显提高。4%ZnO:8YSZ样品在800℃下的电导率达1.68×10-2S/cm。在相同工作条件下,ZnO:8YSZ单电池比8YSZ单电池具有更好的工作性能和更高的效率,以3%ZnO:8YSZ单电池性能最好。

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ZnO:8YSZ (8% in mole yttria stabilized zirconia) electrolyte samples with different amounts of ZnO at 0,1% (in mole,the same below),2%,3% and 4% were sintered at different temperatures in air. The effects of sintering temperature and ZnO content on the sinterability,relative density,bending strength and conductivity of the ZnO:8YSZ sample were investigated. The cell perform-ances were measured and evaluated using ZnO:8YSZ electrolyte supported configuration. The results show that the addition of ZnO can improve the sinterability of 8YSZ electrolyte. The relative density of 4% ZnO:8YSZ sample sintered at 1 400 ℃ for 2 h reaches 99.9%. The bending strength of 3%ZnO:8YSZ sample increases obviously compared with traditional YSZ,reaching over 200 MPa. Total conductivity of 4% ZnO:8YSZ sample is 1.68 × 10-2 S/cm at 800 ℃. The cell of ZnO:8YSZ as electrolyte has better performance and higher efficiency than that of 8YSZ as electrolyte in equal working condition,and the cell performance of 3%ZnO:8YSZ as electrolyte is better.

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基金项目:
国家自然科学基金(50872090);; 贵州省教育厅自然科学研究(2008062)资助项目
作者简介:
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参考文献:

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