TY - JOUR
T1 - Determination of effective oxygen adsorption species for CO sensing based on electric properties of indium oxide
AU - Sun, Yongjiao
AU - Suematsu, Koichi
AU - Watanabe, Ken
AU - Nishibori, Maiko
AU - Hu, Jie
AU - Zhang, Wendong
AU - Shimanoe, Kengo
N1 - Funding Information:
This work was partially supported by JSPS KAKENHI grant Number JP16H04219 and JP17K17941. The authors thank the Fukuoka Industrial Technology Center to observe the SEM image. The authors also thank the Center of Advanced Instrumental Analysis at Kyushu University to observe the TEM image.
Publisher Copyright:
© 2018 The Electrochemical Society.
PY - 2018
Y1 - 2018
N2 - 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 .
AB - 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 .
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U2 - 10.1149/2.0591807jes
DO - 10.1149/2.0591807jes
M3 - Article
AN - SCOPUS:85060500735
SN - 0013-4651
VL - 165
SP - B275-B280
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 7
ER -
