全固化混合电势型NOx传感器传感机理及其制备研究

This project is focused on the basic research of the sensing mechanism and preparation method of solid-state mixed-potential type NOx sensor Through the analysis and exploration on the sensing mechanism, we will establish different response patterns and measurement theories of the sensor. we plan to explore a new and effective sintering technology to realize the co-sintering of the electrolyte YSZ and oxide sensing electrode using the spark plasma sintering (SPS) preparing method.Based on the study of the NOx sensor, we will accomplish the design of a three-electrode plate sensor structure, evaluate the comprehensive indexes of this new structure sensor, and finally complete the materials choice and preparing method optimizaiton.This work is aimed to reveal the sensing mechanism of mixed-potential-type NOx sensor, explore and improve the new preparation technology of sensing electrode, and then to develop high-grade electrolyte and sensing electrode materials.The research results hold great promise in the performance improvement and industrial applications of car-use NOx sensor, which has both remarkable scientific significance and application value.

本项目围绕传感机理及制备技术，开展全固化混合电势型NOx传感器的应用基础研究。通过传感器传感机理分析和探索，建立传感器各种响应模式和测量理论；在制备技术上采用可快速致密烧结的放电等离子烧结（SPS）法，探索一种新型有效的电解质YSZ/氧化物敏感电极共烧结制备技术；以NOx传感器研究为导向，设计三电极平板式传感器结构，综合评价其主要指标和综合指标，完成材料的选择和设计以及制备技术工艺的优化。相关工作将揭示混合电势型NOx传感器传感机理，探索和完善新型有效的敏感电极制备技术，进而开发高品位电解质及敏感电极材料，实现车用NOx传感器的性能突破和加快产业化应用，具有显著的科学意义和重要的应用价值。

以Y2O3稳定的ZrO2（YSZ）为固体电解质的NOx传感器，由于其应用领域广泛、精度高、抗干扰特性强等优点而受到了研究者的青睐。基于YSZ固体电解质NOx传感器的研究大部分的工作主要是围绕电势型NOx传感器的研究，但由于其响应电势一般和被测NOx气体浓度的对数呈线性关系，不利于检测较低浓度的NOx气体。本项目围绕传感机理及制备技术，开展全固化混合电势型NOx传感器的应用基础研究，提出一种基于不同偏置电压的三电极安培型传感器，通过施加偏置电压控制响应信号，提高传感器对多种有害气体的识别特性，进一步在紫外光照射下研究三电极安培型传感器对待测气体的电流响应特性，结果表明信号增强效应明显，有利于低浓度下NOx气体的检测，增加了传感器对有害气体的检测浓度限。相应的结果分别发表在sensors和 Ionics杂志上，文章题目是Discriminating hazardous gas mixture via a zirconia-based amperometric gas sensor和Selective Sensing of Gas Mixture via a Temperature Modulation Approach: New Strategy for Potentiometric Gas Sensor Obtaining Satisfactory Discriminating Features。本项目的研究内容基本按照申请书的研究计划执行。除了NOx气体传感器的相关研究，我们也围绕VOCs复合气体传感阵列光耦合传感技术开展了探索性研究，重要的结果已经被Sensors and Actuators B：Chemical 282 (2019) 529–534接收，文章题目是Artificial tailored catalytic activity for identification of 6 kinds of volatile organic compounds via the light-regulated electrochemical reaction。 依托本项目基金支持，通过几年的努力，共接收和发表相关的SCI文章7篇，实用新型专利1个，相应的发明专利正在申请中。