Glass-coated mixed conducting cobaltites as solid-reference electrode materials for NASICON-based potentiometric CO2 sensors

Shotaro Kishi, Yuji Miyachi, Masayoshi Yuasa, Tetsuya Kida, Kengo Shimanoe, Noboru Yamazoe

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)

抄録

To improve the stability of Na3Zr2Si 2PO12 (NASICON)-based potentiometric CO2 sensors fitted with carbonate/Au layers (sensing electrode), mixed conducting oxides of Li0.4CoO2 and Na0.6CoO2 were examined for their applicability to solid-reference electrodes in terms of their stability against CO2 and humidity. Compared with the Na 0.6CoO2 electrode, the Li0.4CoO2 electrode showed far better stability against CO2. When the Li 0.4CoO2 electrode was coated with a layer of glass, the electrode showed no response to CO2 (200-2000 ppm) and little interference from humidity [21-86% relative humidity (RH)] at 450°C. A CO2 sensor device using Li2CO3-BaCO3 and a glass-coated Li0.4CoO2 showed stable electromotive force (emf) responses to CO2 in humid air (86% RH) at 450°C. The emf of the device was also stable even after it was exposed to humid air (86% RH) containing CO2 (400 ppm) at room temperature for 1-2 days. The present study indicates the promising features of the glass-coated Li 0.4CoO2 as a stable solid-reference material for NASICON-based CO2 sensors.

本文言語英語
ジャーナルJournal of the Electrochemical Society
156
11
DOI
出版ステータス出版済み - 10月 13 2009

!!!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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