Highly selective solid electrolyte sensor for the analysis of gaseousmixtures

Abstract. The operation principle of a commercially available solid electrolyte sensor was modified with respect to applications in flowing gaseous mixtures containing H2 and O2. For this purpose the generally applied coulometric or potentiometric operation mode was replaced by cyclic voltammetry. By varying the sensor temperature, electrode area and potential scan rate, the conditions for the characteristic peak formation for every gas component were determined. While hydrogen oxidation peaks arise at potential scan rates up to 100 mV s−1, oxygen reduction peaks develop between 200 and 1000 mV s−1. A linear relationship between peak area/peak height and concentration was found at concentrations ϕ (H2)