Response characteristics of a stable mixed potential ammonia sensor in simulated diesel exhaust

Kannan P. Ramaiyan; Josh A. Pihl; Cortney R. Kreller; Vitaly Y. Prikhodko; Scott Curran; James E. Parks; Rangachary Mukundan; Eric L. Brosha

doi:10.1149/2.1271709jes

Response characteristics of a stable mixed potential ammonia sensor in simulated diesel exhaust

Kannan P. Ramaiyan, Josh A. Pihl, Cortney R. Kreller, Vitaly Y. Prikhodko, Scott Curran, James E. Parks, Rangachary Mukundan, Eric L. Brosha

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27 Scopus citations

Abstract

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<0.6s). Moreover, in simulations of overdosing a selective catalytic reduction (SCR) system, the sensor was able to selectively respond to 20ppm injections of NH₃ slip despite the presence of the interferent gas species at combined concentrations ten times higher than that of the NH₃. The laboratory sensor construct was transitioned to a pre-commercial, automotive stick sensor configuration that was demonstrated to retain the advantageous characteristics of the tape-cast device.

Original language	English
Pages (from-to)	B448-B455
Journal	Journal of the Electrochemical Society
Volume	164
Issue number	9
DOIs	https://doi.org/10.1149/2.1271709jes
State	Published - 2017

Funding

The authors thank Roland Gravel and the DOE Vehicle Technology Office for providing funding for this work. Evaluation of the sensors under simulated engine exhaust conditions was performed at the National Transportation Research Center, a National User Facility sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office.

Funders	Funder number
DOE Vehicle Technology Office
National User Facility
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Vehicle Technologies Program
Louisiana Transportation Research Center
Vehicle Technologies Office

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title = "Response characteristics of a stable mixed potential ammonia sensor in simulated diesel exhaust",

abstract = "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{\textquoteright}s switching valve (T90<0.6s). Moreover, in simulations of overdosing a selective catalytic reduction (SCR) system, the sensor was able to selectively respond to 20ppm injections of NH3 slip despite the presence of the interferent gas species at combined concentrations ten times higher than that of the NH3. The laboratory sensor construct was transitioned to a pre-commercial, automotive stick sensor configuration that was demonstrated to retain the advantageous characteristics of the tape-cast device.",

author = "Ramaiyan, {Kannan P.} and Pihl, {Josh A.} and Kreller, {Cortney R.} and Prikhodko, {Vitaly Y.} and Scott Curran and Parks, {James E.} and Rangachary Mukundan and Brosha, {Eric L.}",

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AU - Pihl, Josh A.

AU - Kreller, Cortney R.

AU - Prikhodko, Vitaly Y.

AU - Curran, Scott

AU - Parks, James E.

AU - Mukundan, Rangachary

AU - Brosha, Eric L.

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Response characteristics of a stable mixed potential ammonia sensor in simulated diesel exhaust

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