铈锆储氧材料在浓差型汽车氧传感器中的应用研究 -学兔兔 www.xuetutu.com及概要.pdf

学兔兔 第31卷 第5期 仪 器 仪 表 学 报 V01．31 No．5 2010年5月 Chinese Journal of Scientific Instrument May 2010 铈锆储氧材料在浓差型汽车氧传感器中的应用研究水 任继文 (华东交通大学机电丁程学院 南昌 330013) 摘 要：传统浓差型汽车氧传感器在结构上必须有连通大气的空气通道以提供恒定的氧分压，使得其制作工艺复杂、成本高、不 便于微型化。文章提出利用铈基储氧材料的储氧特性，使其作为固态氧分压参考层，来制备一种新型的用于监测汽车尾气排放 的氧浓差型氧传感器。研究利用添加锆形成铈锆复合固溶体氧化物(CZO)来改善氧化铈氧储能力(OSC)，采用共沉淀法制备 了CZO体系储氧材料，研究了老化温度对其相结构、比表面积及氧储能力的影响，并对制作的传感器进行测试，结果显示：在空 燃比为1附近电势发生突变，突变电势范围为520～一200 mV，贫燃时输出电势为负，富燃时输出电势为正。 关键词：浓差型氧传感器；固态参考层；铈锆储氧材料 中图分类号：TP212．2 文献标识码：A 国家标准学科分类代码：460．4020 Research on the application of CeO2-ZrO2 oxygen storage compound to potentiometric automobile oxygen sensor Ren Jiwen (The School of Mechanical Engineering，East China Jiaotong University，Nanchang 330013，China) Abstract：Traditional potentiometric automobile oxygen sensor must be directly exposed to the air by an air duct SO as to provide invariable oxygen partial pressure，and therefore，has many problems such as complex fabrication process，high cost，difficult to be miniaturized，and ete．A novel potentiometric oxygen sensor employing oxygen storage material CeO2 as the solid—state reference is proposed in this paper．The Oxygen Storage Capacity(OSC)of the solid—state reference is raised by doping Zr in CeO2．The CeO2-ZrO2 compound(CZO)is prepared using chemi— cal CO—precipitation method．The effects of high temperature on its phase structure，BET surface area and OSC are studied．Test experiments of the sensor were performed with various value mixture gas at various operating tem- peratures．Experiment results show that the output voltage of the senso