Determination of effective oxygen adsorption species for CO sensing based on electric properties of indium oxide

Yongjiao Sun, Koichi Suematsu, Ken Watanabe, Maiko Nishibori, Jie Hu, Wendong Zhang, Kengo Shimanoe

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

To understand the relationship between adsorbed oxygen on the surface of indium oxide (In 2 O 3 ) and its CO-sensing property in wet and dry atmospheres, the oxygen adsorption properties and sensor response to CO were investigated. In 2 O 3 particles were prepared by a precipitation method and characterized using X-ray diffraction, scanning electron microscopy, and nitrogen absorption measurements. The O− and O 2− adsorption equilibrium constants, K 1 and K 2 , respectively, were calculated from the relationship between the electrical resistance and the oxygen partial pressure (P O2 ) using a competitive adsorption model. It was found that the values of both K 1 and K 2 decreased with increasing humidity, indicating a reduction in the amount of oxygen adsorption on the In 2 O 3 surface in a wet atmosphere. The In 2 O 3 particles can detect CO at ppm level in dry and wet atmospheres, although they were greatly reduced in wet atmospheres. Moreover, we found that the sensor response to CO is closely related to the values of K 1 and K 2 .

本文言語英語
ページ(範囲)B275-B280
ジャーナルJournal of the Electrochemical Society
165
7
DOI
出版ステータス出版済み - 2018

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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