NH4PO3/SiO2 composite as electrolyte for intermediate temperature fuel cells

NH4PO3/SiO2 composite based electrolyte with SiO2 as supporting matrix was prepared. A thermogravimetric analysis was performed. Its electrochemical properties were investigated by an impedance spectroscopy within the temperature range of 100–300 °C under dry and humid atmospheres. The maximum conductivity is 6 mS cm− 1 at 300 °C under dry N2 and 0.1 S cm− 1 at 200 °C under humid N2.