BiCuVO_x/ペロブスカイト酸化物-固体参照電極を取り付けた固体電解質二酸化炭素センサ(秋季シンポジウム若手研究者論文)

概要

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A laminated solid-reference electrode of BiCuVO_x (Bi_2Cu_<0.1>V_<0.9>O_<5.35>)/perovskite-oxide (La_<0.6>Sr_<0.4>Co_<0.78>Ni_<0.02> Fe_<0.2>O_3) was developed for a NASICON (Na_3Zr_2Si_2PO_<12> ; Na^+ conductor)-based potentiometric CO_2 sensor. The fabricated electrochemical cell expressed as, CO_2, O_2/Au (sensing electrode)/Li_2CO_3-BaCO_3 (auxiliary phase)/NASICON/BiCuVO_x/BiCuVO_x-perovskite-oxide (reference electrode)/O_2, responded well to changes in CO_2 concentration (100-400ppm) at 450℃ under high humid conditions (88%RH). The potential of the developed reference electrode was stable and exhibited little interference by water vapor. Furthermore, the reference electrode potential did not response to CO_2 even after the BiCuVO_x layer was contaminated with carbonate, indicating a good stability of BiCuVO_x against CO_2. The sensor device attached with the laminated solid-reference electrode showed a good warming-up characteristic, i.e., the electromotive force (EMF) of the device reached a steady and constant value when the sensor operation is re-started even after the sensor was exposed to humid air containing CO_2 at room temperature.
社団法人日本セラミックス協会の論文
2007-11-01