title: Sensing behavior of YSZ-based amperometric NO₂ sensors consisting of Mn-based reference-electrode and In₂O₃ sensing-electrode.
abstract: Yttria-stabilized zirconia (YSZ)-based amperometric NO(2) sensors comprised of an In(2)O(3) sensing-electrode (SE), a Pt counter-electrode (CE) and a Mn(2)O(3) reference-electrode (RE) in both tubular and rod geometries were fabricated and their sensing characteristics were examined. For comparative purposes, the performance of the In(2)O(3)-SE and Pt-CE were also examined against an internal Pt/air-RE. Experimental observations of tubular YSZ-based gas sensors revealed that a three-electrode system exhibited better electrical signal stability, when compared with a two-electrode system. Additionally, replacing the internal Pt/air-RE with an external Mn(2)O(3)-RE (exposed to the sample gas), was found to have a negligible effect on the gas sensing characteristics of the tubular sensor. This gas sensing equivalence indicates that Mn(2)O(3)-RE can successfully replace the Pt/air-RE in an amperometric gas sensor. Similarly, rod-type sensors utilizing an In(2)O(3)-SE and a Mn(2)O(3)-RE were observed to have almost identical NO(2) sensing characteristics to that of the tubular sensor. Furthermore, both sensors (tubular or rod geometry) exhibited a linear response to increasing NO(2) concentration in the range of 20-200 ppm at 550°C.
authors.affiliation: Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan.
authors.forename: Han
authors.initials: H
authors.lastname: Jin
authors.forename: Michael
authors.initials: M
authors.lastname: Breedon
authors.forename: Norio
authors.initials: N
authors.lastname: Miura
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D004563:Electrochemistry; D004566:Electrodes; D004867:Equipment Design; D007204:Indium / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry; D009585:Nitrogen Dioxide / Q000032:analysis*; D010087:Oxides / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D017895:Manganese Compounds; D010087:Oxides; D007204:Indium; D010984:Platinum; C047711:indium oxide; D015019:Yttrium; C027424:manganese oxide; D015040:Zirconium; C028541:zirconium oxide; D009585:Nitrogen Dioxide; C091417:yttria