锆基电位型CO传感器的制备及其响应性能研究

Research on Fabrication and Performance of Zirconia-based CO Sensor

为提高CO传感器的灵敏度,采用丝网印刷技术制备了一系列以钇稳定氧化锆为固体电解质、以Zn O材料中掺杂不同比例的In2O3为敏感电极、以Pt为参比电极的片式结构电位型CO传感器,并于特定的工作条件下测试其对不同气体组分的响应性能.结果表明,当掺杂比例为质量分数0.3,烧结温度为1 200℃且工作温度为500℃时,传感器对CO气体的响应值最大,达到-59 m V,接近未掺杂前的2倍,传感器的灵敏度有很大提高.并为阐述传感器的敏感机理,开展了相应的材料结构表征(XRD/SEM)和电化学催化活性(阻抗谱)测试研究.

To improve the sensitivity of CO sensor, several plate structure potential sensors are prepared using screen-printing technology. The process is operated on yttria-stablilzed zirconia, taking ZnO materials doped with different proportion of In203 as the sensing electrode and Pt as the reference electrode. The sensing characteristics of these sensors are evaluated under fixed conditions. The results indicate that the response reaches the largest in value with the doping ratio being 30 wt.%, sintering temperature being 1200~C and working temperature being 500 ~C, which reaches -59mV, nearly twice as much as that before doped, suggesting the significantly improved sensitivity of the sensor. Finally, a series of characterization methods such as SEM, XRD as well as the evaluation of the electrochemical catalytic activity （refers to impedance spectroscopy） are adopted to establish the correlation between the microstructure of the SEs, based on which the working principle of the sensor is illustrated in detail.