Preparation of proton-conductive organic-inorganic hybrid titanophosphite membranes

► Membrane with a gradation of monomer conversion was made by UV absorption. ► IR spectra revealed that the monomer conversion is high at top and low at bottom. ► The proton conductivity was 6.3 × 10-4 S cm-1 at 150 °C under N2 atmosphere. ► The proton conductivity was 8.0 × 10-3 S cm-1 at 80 °C and 85% RH.