積層型イオン導電体Li_2O・Sm_2O_3・2SiO_2+0.92ZrO_2・0.08Yb_2O_3を用いた電位検出型CO_2ガスセンサー

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A solid state electrochemical cell, (-)CO_2, O_2, Pt|0.92ZrO_2・0.08Yb_2O_3+Li_2O・Sm_2O_3・2SiO_2|Au, Li_2CO_3, CO_2, O_2(+), was investigated for the monitor of carbon dioxide in air. A layer type ionic conductor prepared from Li^+ ionic conductor and O^<2-> ionic conductor by the thermal treatment was used as solid electrolytes. In the range of 450 to 600℃, the electromotive force, EMF, of the sensor increased linearly with an increase in the logarithm of CO_2 partial pressure, in accordance with the Nernst law. On the other hand, the EMF was little affected by the change of O_2 partial pressure. At the detection electrode, the two-electron transfer and the four-electron transfer were found to occur for CO_2 and O_2, respectively. The four-electron transfer reaction associated with O_2 molecules was found to occur at both the detection and counter electrodes, indicating that this sensor has an excellent selectivity for CO_2. The 90% response time was within 4 min. The EMF was not influenced by the introduction of water vapor.
1998-01-01