Response Characteristics of a Stable Mixed Potential Ammonia Sensor in Simulated Diesel Exhaust

A mixed potential sensor using Au and Pt dense wire electrodes embedded between tape-casted layers of 8 mol% yttria stabilized zirconia (YSZ) was tested for application toward NH3, NO, NO2, C3H6 and C3H8. In single-gas testing, the sensor exhibited the highest response toward NH3, while still exhibi...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2017-01, Vol.164 (9), p.B448-B455
Main Authors: Ramaiyan, Kannan P., Pihl, Josh A., Kreller, Cortney R., Prikhodko, Vitaly Y., Curran, Scott, Parks, James E., Mukundan, Rangachary, Brosha, Eric L.
Format: Article
Language:English
Subjects:
ADVANCED PROPULSION SYSTEMS
Energy Sciences
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Mixed potential Sensors, ammonia, AuPd
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Summary:A mixed potential sensor using Au and Pt dense wire electrodes embedded between tape-casted layers of 8 mol% yttria stabilized zirconia (YSZ) was tested for application toward NH3, NO, NO2, C3H6 and C3H8. In single-gas testing, the sensor exhibited the highest response toward NH3, while still exhibiting reasonably high sensitivity toward other interferent gases. The sensor was tested in a high-flow reactor at the National Transportation Research Center (NTRC) in order to simulate exhaust gas constituents and flow rates produced by lean-burn vehicles powered by Compression-Ignition Direct-Injection (CIDI), diesel engines. The sensor was characterized at 525 and 625°C for NH3, CO, C3H6, C3H8, and NOx in a base gas composition of 10% O2, 5% H2O, and 5% CO2 flowing at 15 slpm. The sensor exhibited fast response time equal to the response time of the system's switching valve (T90
ISSN:0013-4651
1945-7111
DOI:10.1149/2.1271709jes