センサ素子及びガスセンサ

Abstract

This sensor element 101 comprises element bodies (layers 1-6) in the interior of which flow passages for a gas being measured are provided, a measurement electrode 44, a reference electrode 42, a reference gas introduction part 49, and a heater 72 for heating the element bodies. The reference gas introduction part 49 has a reference gas introduction space 43 that is open to the exterior of the element bodies and that introduces a reference gas into the element bodies, and a porous reference gas introduction layer 48 that allows the reference gas to flow from the reference gas introduction space 43 to the reference electrode. The reference gas introduction layer 48 has a first porous region 85 and a second porous region 86 in a channel portion 84, which is a reference gas channel between the reference gas introduction space 43 and the reference electrode 42. The second porous region 86 has a low-porosity region 86a having a lower porosity than the first porous region 85 and is positioned closer to the reference electrode 42 than is the first porous region 85.

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