This study is an attempt to prepare proton-conducting glasses based on heteropolyacids for the H-2/O-2 fuel cell application. The phosphomolybdic acid (PMA)-containing glass membranes were characterized by thermogravimetry/differential thermal analysis, N-2-adsorption-desorption analysis, and impedance measurements. Thermogravimetric analysis shows that the incorporation of silicaphosphate and PMA does not affect the thermostablity of P2O5-SiO2-PMA glass. The textural properties were investigated from a N-2 adsorption-desorption analysis. The electrical conductivity was carried out under humid and temperature conditions and yielded a high proton conductivity of 7.4 x 10(-2) S/cm at 90 degrees C and relative humidity (RH) 70%. The potential-current characteristics of a H-2/O-2 fuel cell using heteropolyacid glasses as an electrolyte were studied at low temperatures. The open-circuit potential was 1 V. The current density of 82.2 mA/cm(2) at 0.2 V, as well as the maximum power density of 22.9 mW/cm(2) at 56 mA/cm(2), was achieved in the presence of hydrogen and oxygen feed at 30 degrees C and RH 30% with one atmospheric pressure. (c) 2006 The Electrochemical Society.