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The effect of phosphorus ions on the proton conductivity was examined for the sol-gel-derived glasses. The porous glasses were prepared through hydrolysis of PO(OCH 3 ) 3 and Si(OC 2 H 5 ) 4 , in which the phosphorus ions consisted of the POH bonds and were dissolved into the silica matrix without any P-O-Si bond. The electrical conductivity increased in a humid atmosphere and reached ϳ30 mS/cm at 50°C under 70% RH. High conductivity is achieved by both the POH bonds and the molecular water bonded to the POH bonds. The conductivity increased with a change in humidity from 40% to 80% RH. The phosphorus ions were selectively dissolved in water, resulting in a lower conductivity.

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