Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Solid-State $CO_2$ Sensor using ${Li_2}{CO_3}-{Li_3}{PO_4}-{Al_2}{O_3}$ Solid Electrolyte and ${LiMn_2}{O_4}$ as Reference Electrode

${Li_2}{CO_3}-{Li_3}{PO_4}-{Al_2}{O_3}$계의 고체 전해질 및 ${LiMn_2}{O_4}$의 기준전극을 사용한 $CO_2$ 가스센서

  • 김동현 (부산대학교 무기재료공학과) ;
  • 윤지영 (부산대학교 무기재료공학과) ;
  • 박희찬 (부산대학교 무기재료공학과) ;
  • 김광호 (부산대학교 무기재료공학과)
  • Published : 2000.08.01
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Abstract

A solid-state electrochemicall cell for sensing CO2 gas was fabricated using a solid electrolyte of Li2CO3-Li3PO4-Al2O3 mixture and a reference electrode of LiMn2O4. The e.m.f. (electromotive force) of sensor showed a good accordance with theoretical Nernst slope (n=2) for CO2 gas concentration range of 100-10000 ppm above 35$0^{\circ}C$. The e.m.f. of sensor was constant regardless of oxygen partial pressure at the high temperature above 0.1 atm. It was, however, a little depended on oxygen partial pressure as the pressure decreased below 0.1 atm. The oxygen-dependency of our sensor gradually disappeared as the operating temperature increased. The sensing behavior of our CO2 sensor was affected by the presence of water vapor, but its effect was small comparing with other sensors.

Keywords

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