Abstract
Oxygen adsorption plays key roles in resistive-type SnO2 gas sensors that can very sensitively detect combustible gases such as CO and hydrocarbons. Thus, exact evaluation of the electric resistance of SnO 2 in response to oxygen is important to understand the oxygen adsorption mechanism. However, infinitesimal impurities contained in even high-grade commercial oxygen cylinders impose great effect on the sensitivity of SnO2. In this study, we designed an experimental system, which composed of gas pretreatment chambers including a Pt/Al2O3 combustion catalyst and a zeolite adsorbent, for exact analysis of gas sensing properties. Our experimental system allowed for the accurate determination of the dependence of the electrical resistance (R) on oxygen partial pressure (PO2) by removing impurities in sample gases. According to the linear correlation between R versus PO2 1/4, we concluded that oxygen adsorbed on the SnO2 surface in the form of O2- at 350 and 450°C in extremely dry conditions that was achieved using the experimental system. The competitive adsorption on the SnO2 surface in the form of O- and O2- was suggested at 300°C.
| Original language | English |
|---|---|
| Journal | Journal of the Electrochemical Society |
| Volume | 161 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jan 1 2014 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Electrochemistry
- Materials Chemistry
Cite this
Determination of oxygen adsorption species on SnO2 : Exact analysis of gas sensing properties using a sample gas pretreatment system. / Suematsu, Koichi; Yuasa, Masayoshi; Kida, Tetsuya; Yamazoe, Noboru; Shimanoe, Kengo.
In: Journal of the Electrochemical Society, Vol. 161, No. 6, 01.01.2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Determination of oxygen adsorption species on SnO2
T2 - Exact analysis of gas sensing properties using a sample gas pretreatment system
AU - Suematsu, Koichi
AU - Yuasa, Masayoshi
AU - Kida, Tetsuya
AU - Yamazoe, Noboru
AU - Shimanoe, Kengo
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Oxygen adsorption plays key roles in resistive-type SnO2 gas sensors that can very sensitively detect combustible gases such as CO and hydrocarbons. Thus, exact evaluation of the electric resistance of SnO 2 in response to oxygen is important to understand the oxygen adsorption mechanism. However, infinitesimal impurities contained in even high-grade commercial oxygen cylinders impose great effect on the sensitivity of SnO2. In this study, we designed an experimental system, which composed of gas pretreatment chambers including a Pt/Al2O3 combustion catalyst and a zeolite adsorbent, for exact analysis of gas sensing properties. Our experimental system allowed for the accurate determination of the dependence of the electrical resistance (R) on oxygen partial pressure (PO2) by removing impurities in sample gases. According to the linear correlation between R versus PO2 1/4, we concluded that oxygen adsorbed on the SnO2 surface in the form of O2- at 350 and 450°C in extremely dry conditions that was achieved using the experimental system. The competitive adsorption on the SnO2 surface in the form of O- and O2- was suggested at 300°C.
AB - Oxygen adsorption plays key roles in resistive-type SnO2 gas sensors that can very sensitively detect combustible gases such as CO and hydrocarbons. Thus, exact evaluation of the electric resistance of SnO 2 in response to oxygen is important to understand the oxygen adsorption mechanism. However, infinitesimal impurities contained in even high-grade commercial oxygen cylinders impose great effect on the sensitivity of SnO2. In this study, we designed an experimental system, which composed of gas pretreatment chambers including a Pt/Al2O3 combustion catalyst and a zeolite adsorbent, for exact analysis of gas sensing properties. Our experimental system allowed for the accurate determination of the dependence of the electrical resistance (R) on oxygen partial pressure (PO2) by removing impurities in sample gases. According to the linear correlation between R versus PO2 1/4, we concluded that oxygen adsorbed on the SnO2 surface in the form of O2- at 350 and 450°C in extremely dry conditions that was achieved using the experimental system. The competitive adsorption on the SnO2 surface in the form of O- and O2- was suggested at 300°C.
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UR - http://www.scopus.com/inward/citedby.url?scp=84904793512&partnerID=8YFLogxK
U2 - 10.1149/2.004406jes
DO - 10.1149/2.004406jes
M3 - Article
VL - 161
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 6
ER -