RESPONSE OF A SOLID-STATE POTENTIOMETRIC SENSOR USING LaF3 TO A SMALL AMOUNT OF H2 OR CO IN AIR AT LOWER TEMPERATURES

Abstract

A solid electrolyte cell using LaF₃ was found to be able to detect a small amount of H₂ or CO in air at lower temperatures. The 90% response of the electromotive force (EMF) of the sensor to 1.3% H₂ in air was as fast as 3 min at 20 °C. The sensing mechanism is attributed to a mixed electrode potential on the sensing electrode.