基于磷灰石型硅酸镧电解质和纳米敏感电极的电流型NOx传感器

项目名称： 基于磷灰石型硅酸镧电解质和纳米敏感电极的电流型NOx传感器

项目编号： No.51272067

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 王岭

作者单位： 河北联合大学

项目金额： 80万元

中文摘要： 汽油机在稀薄燃烧运行可有效降低污染物排放，提高热效率，但需"吸藏还原催化剂"来解决NOx的去除问题。而该催化剂对NOx脱除和再生过程必须由在线NOx传感器控制，因此开发可满足上述要求的NOx传感器就变得极为迫切。本研究以磷灰石型硅酸镧氧离子导体为电解质，以浸渍法获得的纳米结构材料为敏感电极，制备平面电流型NOx传感器。拟研究：（1）湿化学法合成硅酸镧的工艺，探索过渡金属硅位多取代对其相纯度、电导率和烧结性能的影响规律；（2）浸渍技术原位制备纳米结构敏感材料的工艺，以及敏感材料与电解质的化学相容性；（3）敏感材料组成，微观结构，三相界面结构等对传感器性能的影响，实现敏感功能的设计和调控；（4）传感器响应机理及其性能影响因素，实现其在灵敏度、响应速度、抗干扰和长期稳定性等方面的提高。通过研究，解决在传感器制备和响应中的一些科学问题，取得一些自主产权成果，为实际应用奠定基础。

中文关键词： NO2 传感器；磷灰石型硅酸镧；电流型；纳米结构电极；固体电解质

英文摘要： Gasoline engine operating in lean burn region can effectively decrease exhaust gases emission and increase heat efficiency, but NOx storage/reduction catalyst is needed in order to remove NOx. However, NOx removal by catalyst storage and the catalyst regeneration process require to be monitored by NOx sensors, so it is very important to develop NOx sensor based on solid electrolyte which can meet above requirments.In this proposal, a planar amperometric NOx sensor will be fabricated based on apatite lanthanum silicate electrolyte and nano-structured sensing electrodes prepared by infiltration technology. The research work includes:(1)Effect of multi-elements doping in the Si sites in lanthanum silicate by wet chemical methods on its phase purity,conductivity and sinterability will be studied;(2) Route of preparation of nano-structured sensing materials and compatability between electrolyte and sensing electrode will be investigated;(3)Investigating into effect of composition and microstructure of sensing materials and micro-structure of three-phase boundary on sensors performance,the sensing fuction design and sensing performance tuning of the sensor will be realized; (4)Sensing mechanism and influential factors for sensor properties will be addressed and sensitivity, response rate, anti-interference ability an

英文关键词： NO2 sensor；apatite lanthanum silicate；amperometric type；nano-structured electrode；solid electrolyte