Influences of water vapor on NASICON-based CO2 sensor operative at room temperature

Kenji Obata, Kengo Shimanoe, Norio Miura, Noboru Yamazoe

研究成果: ジャーナルへの寄稿会議記事査読

15 被引用数 (Scopus)


Electrochemical CO2 sensors were fabricated with NASICON (Na3Zr2Si2PO12) disks containing different levels of Na3PO4. The marked differences of the effect of aging in humid condition revealed that the auxiliary phase (NaHCO3 and/or Na2CO3) was formed spontaneously from the Na3PO4 impurity of NASICON in the presence of water vapor and CO2. Even when the auxiliary phase was formed or intentionally added, CO2 sensing properties were easily lost completely under exposure to dry atmosphere, indicating active involvement of water vapor in the CO2 sensing electrode reactions. EMF versus CO2 concentration correlations usually tended to shift up with increasing relative humidity. Remarkably, this shift was reduced effectively by introducing Li2CO3 as an auxiliary phase, suggesting that the shift originates from the instability of NaHCO3 and/or Na2CO3 in humid atmosphere.

ジャーナルSensors and Actuators, B: Chemical
出版ステータス出版済み - 8月 1 2003
イベントProceedings of the Ninth International Meeting on Chemical Engineering - Boston, MA, 米国
継続期間: 7月 7 20037月 10 2003

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 器械工学
  • 凝縮系物理学
  • 表面、皮膜および薄膜
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学


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