Application of Commercial Manufacturing Methods to Mixed-Potential NO_x Sensors

摘要

Commercial manufacturing methods have been used to fabricate a planar, self-heated, tape-cast, mixed-potential NO_x sensor for application in vehicle on-board emission control systems. The device consists of dense La_(0.8)Sr_(0.2)CrO_3 (LSCrO) and Pt electrodes and a porous YSZ electrolyte on one side of a dense ceramic substrate and a Pt-heater with independent leads on the backside of the substrate. These planar mixed-potential sensors are capable of selectively detecting ppm levels of NO_x when operated at a positive bias. Additionally, the device has yielded stable performance under months of testing as a result of the stable morphology of the electrode/electrolyte/gas phase interface.