Determination of oxygen adsorption species on SnO2: Exact analysis of gas sensing properties using a sample gas pretreatment system

Koichi Suematsu, Masayoshi Yuasa, Tetsuya Kida, Noboru Yamazoe, Kengo Shimanoe

Research output: Contribution to journalArticle

29 Citations (Scopus)

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 PO21/4, 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 languageEnglish
Pages (from-to)B123-B128
JournalJournal of the Electrochemical Society
Volume161
Issue number6
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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