基于钙钛矿型 NaBiTiO 电解质的新型高灵敏度 NO 传感器。

A Novel Highly Sensitive NO Sensor Based on Perovskite NaBiTiO Electrolyte.

机构信息

National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, Gongye Road No. 523, Fuzhou 350002, Fujian, P. R. China.

College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, China.

出版信息

Sci Rep. 2017 Jul 10;7(1):4997. doi: 10.1038/s41598-017-05169-4.

DOI:10.1038/s41598-017-05169-4

PMID:28694507

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5504058/

Abstract

NO is one of dangerous air pollutants, and the demands for reliable sensors to detect NO are extremely urgent recently. Conventional fluorite-phase YSZ used for NO sensor requires higher operating temperature to obtain desirable oxygen ion conductivity. In this work, perovskite-phase NaBiTiO (NBT) oxygen conductor was chosen as the solid electrolyte to fabricate a novel highly sensitive NO sensor with CuO as the sensing electrode and Pt as reference electrode. Na dopped NaBiTiO greatly improved the sensing performance of this sensor. The optimal sensor based on NaBiTiO exhibited good response-recovery characteristics to NO and the response current values were almost linear to NO concentrations in the range of 50-500 ppm at 400-600 °C. The response current value towards NO reached maximum 11.23 μA at 575 °C and the value on NO is much higher than other gases (CH, CH, CH, CH, CO), indicating good selectivity for detecting NO. The response signals of the sensor were slightly affected by coexistent O varying from 2 to 21 vol% at 575 °C. The response current value decreased only 4.9% over 2 months, exhibiting the potential application in motor vehicles.

摘要

NO 是一种危险的空气污染物，最近对能够可靠检测 NO 的传感器的需求极为迫切。传统用于 NO 传感器的萤石相 YSZ 需要更高的工作温度才能获得理想的氧离子电导率。在这项工作中，选择钙钛矿相 NaBiTiO（NBT）氧导体作为固体电解质，以 CuO 作为传感电极和 Pt 作为参考电极，制备了一种新型的高灵敏度 NO 传感器。Na 掺杂的 NaBiTiO 极大地提高了该传感器的传感性能。基于 NaBiTiO 的最佳传感器对 NO 表现出良好的响应-恢复特性，在 400-600°C 下，响应电流值在 50-500ppm 的范围内几乎呈线性关系。在 575°C 时，对 NO 的响应电流值达到最大值 11.23μA，并且对 NO 的响应值远高于其他气体（CH、CH、CH、CH、CO），表明对检测 NO 具有良好的选择性。在 575°C 时，传感器的响应信号受共存 O 的影响很小，O 的范围为 2-21vol%。在 2 个月的时间里，响应电流值仅下降了 4.9%，显示出在汽车中的潜在应用。