期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 256, 期 -, 页码 351-358出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.10.014
关键词
NOx sensor; Impedancemetric; LaSrMnO3 composites; Dense electrodes
资金
- National Science Foundation under the Ceramics Division [DMR-1410670]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410670] Funding Source: National Science Foundation
Impedancemetric NOx sensors composed of dense La0.8Sr0.2MnO3 (LSM) and LSM composite electrodes were evaluated based on the electrical response, sensitivity, and selectivity to NO at operating temperatures ranging from 575 - 675 degrees C under dry and humidified gas environments. The composite electrodes investigated containing 10 wt% Au or 30 wt% Y2O3-ZrO2 (YSZ) were accompanied by a porous YSZ electrolyte. The LSM-Au electrodes demonstrated a higher response to NO with limited cross-sensitivity to water, in comparison to LSM and LSM-YSZ sensing electrodes. However, the response and recovery time of LSM and LSM-YSZ based sensors was more rapid than that of LSM-Au based sensors. The rate limiting mechanism effecting sensor behavior appeared to be oxygen reduction regardless of the sensor electrode. Transport of atomic oxygen was an additional rate limiting step for the LSM and LSM-YSZ based sensors. Cross-sensitivity analysis indicated the LSM-Au based sensors were more selective to NOx, in comparison to CO, CO2 and CH4. Overall, the 10 wt% Au addition to LSM appeared to enhance sensor sensitivity to NOx by enabling NOx reactions to proceed more readily. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据