| 摘要 |
PURPOSE:To provide a gas detection element with a proper gas selectivity by arranging catalyst layers different in the catalyzing capacity on a pair of electrodes over a substrate mode of an oxygen ion conducting solid electrolyte. CONSTITUTION:A pair of electrodes 2 are provided on a substrate 1 employing zirconia as solid electrolyte. For example, when selectively detecting CO, one of the electrodes 2 is provided with a first catalyst layer 3 capable of fully oxidizing CO and H2 or alcohol as well. On the other hand, a second catalyst layer 4 which can oxidize H2 and alcohol almost completely but not enough to oxidize CO is provided covering the other electrode and the first catalyst layer 3. The second catalyst layer 4 herein used employs, for example, Pt dispersed in alumina. The gas detection element thus arranged selectively detects CO and generates an electromotive force between the electrodes according to the density thereof. |
