HYDROGEN-PRODUCTION FROM DIRECT WATER-SPLITTING AT HIGH-TEMPERATURES USING A ZRO2-TIO2-Y2O3 MEMBRANE

The ZrO2-TiO2-Y2O3 system exhibits high ionic and electronic conductiv ity at high temperatures under low oxygen partial pressures. Using thi s system as a membrane for gas separation, hydrogen can be produced fr om direct water splitting at high temperatures. Vaporized water was di ssociated at high temperatures and oxygen permeated through the membra ne by the oxygen partial pressure difference. With increasing oxygen p artial pressure difference, water dissociation was promoted and the am ount of the produced hydrogen was increased.