| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas sensor element suppressing the output shift caused by hydrogen gas and achieving the stabilization of responsiveness/output, and also to provide a method for manufacturing the element, and a gas sensor. <P>SOLUTION: The gas sensor element 1 has a solid electrolyte, an electrode on the side of gas to be measured, an electrode on the side of reference gas, and a porous diffusion resistance layer 14. A catalyst layer 2 composed of catalyst support particles 21 and a catalytic noble metal 22 is formed on the outer surface 141 introducing the gas to be measured of the porous diffusion resistance layer 14 and a plurality of protective layers (first protective layer 3 and second protective layer 4) comprising oxide particles 31 and 41 respectively different in average particle size, are formed on the catalyst layer 2. The average particle size of the catalyst support particles 21 constituting the catalyst layer 2 is equal to or smaller than that of the oxide particles 31 constituting the first protective layer 3 adjacent to the catalyst layer 2, and the average particle sizes of the oxide particles 31 and 41 constituting the first and second protective layers 3 and 4 are larger as a layer is farther from the catalyst layer 2. <P>COPYRIGHT: (C)2011,JPO&INPIT |
