Application of x-ray tomography to optimization of new NOx/NH3 mixed potential sensors for vehicle on-board emissions control

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Mixed potential sensors for the detection of hydrocarbons, NO{sub x}, and NH{sub 3} have been previously developed at Los Alamos National Laboratory (LANL). The LANL sensors have a unique design incorporating dense ceramic-pelletlmetal-wire electrodes and porous electrolytes. The performance of current-biased sensors using an yttria-stabilized zirconia (YSZ) electrolyte and platinum and La{sub 0.8}Sr{sub 0.2}CrO{sub 3} electrodes is reported. X-ray tomography has been applied to non-destructively examine internal structures of these sensors. NO{sub x} and hydrocarbon response of the sensors under various bias conditions is reported, and very little NO{sub x} response hysteresis was observed. The application of a 0.6 {mu}A ... continued below

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Nelson, Mark A; Brosha, Eric L; Mukundan, Rangachary & Garzon, Fernando H January 1, 2009.

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Mixed potential sensors for the detection of hydrocarbons, NO{sub x}, and NH{sub 3} have been previously developed at Los Alamos National Laboratory (LANL). The LANL sensors have a unique design incorporating dense ceramic-pelletlmetal-wire electrodes and porous electrolytes. The performance of current-biased sensors using an yttria-stabilized zirconia (YSZ) electrolyte and platinum and La{sub 0.8}Sr{sub 0.2}CrO{sub 3} electrodes is reported. X-ray tomography has been applied to non-destructively examine internal structures of these sensors. NO{sub x} and hydrocarbon response of the sensors under various bias conditions is reported, and very little NO{sub x} response hysteresis was observed. The application of a 0.6 {mu}A bias to these sensors shifts the response from a hydrocarbon response to a NO{sub x} response equal for both NO and NO{sub 2} species at approximately 500 {sup o}C in air.

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  • 215th Meeting of The Electrochemical Society ; May 24, 2009 ; San Francisco, CA

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  • Report No.: LA-UR-09-01159
  • Report No.: LA-UR-09-1159
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956555
  • Archival Resource Key: ark:/67531/metadc928996

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  • January 1, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 2:54 p.m.

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Nelson, Mark A; Brosha, Eric L; Mukundan, Rangachary & Garzon, Fernando H. Application of x-ray tomography to optimization of new NOx/NH3 mixed potential sensors for vehicle on-board emissions control, article, January 1, 2009; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc928996/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.