Abstract
The present research is oriented toward the task of developing improved electrolytes for fuel cells. A new type of glass electrolyte, consisting of various amounts of phosphomolybdic acid (PMA) doped onto a constant amount of titanium oxide in the silicaphosphate gels has been prepared by a sol-gel technique. The effect of PMA on the properties of the glass composite membrane were investigated by means of Fourier transform infrared, -adsorption/desorption tests, thermogravimetric and differential thermal analysis, proton conductivity, and hydrogen permeability measurements. An average pore size of about was determined by the Brunauer–Emmett–Teller method. This new class of electrolytes was found to be stable up to and displayed a high proton conductivity, i.e., at and 70% relative humidity, as well as mechanical strength. These properties proved that these glass electrolytes were very good candidates in membranes for low-temperature fuel cells. The electrochemical behavior of such novel glass membranes was studied in an environment of hydrogen and oxygen gas at room temperature, and the results are presented and discussed.
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