Sensing behavior of YSZ-based amperometric NO2 sensors consisting of Mn-based reference-electrode and In2O3 sensing-electrode

► YSZ-based sensors featuring In2O3-SE and Mn2O3-RE were fabricated and examined. ► Mn2O3-RE can successfully replace the Pt/air-RE in an amperometric gas sensor. ► Tubular and rod-type sensors using Mn2O3-RE had similar sensing characteristics. ► Sensors exhibited a linear response to increasing NO2 concentration (20-200 ppm).