New catalyst monitoring sensor for gasoline engine using YSZ-Al2O3 as solid electrolyte and gas diffusion barrier

Jong Heun Lee; Byung Ki Kim; Kyo Yeol Lee; Ho In Kim; Ki Woo Han

doi:10.1016/S0925-4005(99)00008-8

New catalyst monitoring sensor for gasoline engine using YSZ-Al₂O₃ as solid electrolyte and gas diffusion barrier

Jong Heun Lee, Byung Ki Kim, Kyo Yeol Lee, Ho In Kim, Ki Woo Han

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A new sensor to monitor the degradation of three-way catalyst was designed by stacking three layers of the same YSZ (Yttria Stabilized Zirconia)-Al₂O₃ porous composite with two Pt electrodes being inserted in between. Each composite layer could serve as an oxide-ionic conductor as well as a gas diffusion barrier. Under an appropriate polarization voltage (0.4 V) applied between the Pt electrodes, the central layer attached with the electrodes, Pt|YSZ-Al₂O₃|Pt, worked as an oxygen pumping cell, while the upper or lower YSZ-Al₂O₃ layer worked as a gas diffusion barrier to provide the limiting current with respect to excess O₂ in the fuel-lean atmosphere or that with respect to excess reducing gases like CO, H₂, and C_mH_n in the fuel-rich condition. The amperometric signal was well proportional to the deviation of air/fuel ratio from the stoichiometric one so that a wide range of catalyst degradation could be monitored very well by this sensor. This sensor has advantages of simple operating algorithm, easy fabrication, and high thermal shock resistance.

Original language	English
Pages (from-to)	9-15
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	59
Issue number	1
DOIs	https://doi.org/10.1016/S0925-4005(99)00008-8
Publication status	Published - 1999 Oct 5
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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abstract = "A new sensor to monitor the degradation of three-way catalyst was designed by stacking three layers of the same YSZ (Yttria Stabilized Zirconia)-Al2O3 porous composite with two Pt electrodes being inserted in between. Each composite layer could serve as an oxide-ionic conductor as well as a gas diffusion barrier. Under an appropriate polarization voltage (0.4 V) applied between the Pt electrodes, the central layer attached with the electrodes, Pt|YSZ-Al2O3|Pt, worked as an oxygen pumping cell, while the upper or lower YSZ-Al2O3 layer worked as a gas diffusion barrier to provide the limiting current with respect to excess O2 in the fuel-lean atmosphere or that with respect to excess reducing gases like CO, H2, and CmHn in the fuel-rich condition. The amperometric signal was well proportional to the deviation of air/fuel ratio from the stoichiometric one so that a wide range of catalyst degradation could be monitored very well by this sensor. This sensor has advantages of simple operating algorithm, easy fabrication, and high thermal shock resistance.",

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AU - Han, Ki Woo

PY - 1999/10/5

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AB - A new sensor to monitor the degradation of three-way catalyst was designed by stacking three layers of the same YSZ (Yttria Stabilized Zirconia)-Al2O3 porous composite with two Pt electrodes being inserted in between. Each composite layer could serve as an oxide-ionic conductor as well as a gas diffusion barrier. Under an appropriate polarization voltage (0.4 V) applied between the Pt electrodes, the central layer attached with the electrodes, Pt|YSZ-Al2O3|Pt, worked as an oxygen pumping cell, while the upper or lower YSZ-Al2O3 layer worked as a gas diffusion barrier to provide the limiting current with respect to excess O2 in the fuel-lean atmosphere or that with respect to excess reducing gases like CO, H2, and CmHn in the fuel-rich condition. The amperometric signal was well proportional to the deviation of air/fuel ratio from the stoichiometric one so that a wide range of catalyst degradation could be monitored very well by this sensor. This sensor has advantages of simple operating algorithm, easy fabrication, and high thermal shock resistance.

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New catalyst monitoring sensor for gasoline engine using YSZ-Al₂O₃ as solid electrolyte and gas diffusion barrier

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