NOx sensor element and NOx sensor
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United States of America Patent
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Jan 10, 2023
Grant Date -
Oct 8, 2020
app pub date -
Mar 30, 2020
filing date -
Apr 8, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A NOx sensor element includes: a first pump cell configured to adjust an oxygen concentration in a first measurement chamber; a diffusion resistance portion configured to adjust a diffusion rate of a measurement target gas introduced into the first measurement chamber; and a second pump cell in which a pump current corresponding to a NOx concentration in the measurement target gas after the adjustment of the oxygen concentration, flows. The first pump cell includes: a first solid electrolyte; an inner pump electrode containing a noble metal, and exposed to the first measurement chamber; and an outer pump electrode containing a noble metal, and disposed outside the first measurement chamber. The outer pump electrode contains not less than 22% by mass of a main component of the first solid electrolyte.
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