Electromotive Force Responses of Cl2 Gas Sensor Using BaCl2 ‐ KCl Solid Electrolyte

Abstract

A gas sensor using solid electrolyte was investigated. The conductivity was greatly enhanced by doping of the system, and a maximum conductivity of at 573 K was obtained for. The sensor probe was prepared by a melting method at 1373 K. The electromotive force (EMF) measurement with the gas sensor using the solid electrolyte was performed with an solid reference electrode and an measuring electrode. Good agreement between the measured and the calculated EMF values was obtained for gas concentrations from 50 to 10,000 ppm at 623 K. The EMF response time with a change in concentration is ca.1 min for above 100 ppm and 2 to 5 min for lower concentrations. The measured EMF was not influenced by or gas concentration. This sensor probe was very stable in the presence of water vapor at 623 K during a 90 day test period.