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- W2046618323 abstract "Titanium phosphate is currently a promising material for proton exchange membrane fuel cells applications (PEMFC) allowing for operation at high temperature conditions. In this work, titanium phosphate was synthesized from tetra iso-propoxide (TTIP) and orthophosphoric acid ( H 3 PO 4 ) in different ratios by a sol gel method. High BET surface areas of 271 m 2 .g -1 were obtained for equimolar Ti:P samples whilst reduced surface areas were observed by varying the molar ratio either way. Highest proton conductivity of 5.4×10 -2 S . cm -1 was measured at 20°C and 93% relative humidity (RH). However, no correlation was observed between surface area and proton conductivity. High proton conductivity was directly attributed to hydrogen bonding in P - OH groups and the water molecules retained in the sample structure. The proton conductivity increased with relative humidity, indicating that the Grotthuss mechanism governed proton transport. Further, sample Ti/P with 1:9 molar ratio showed proton conductivity in the order of 10 -1 S.cm -1 (5% RH) and ~1.6×10 -2 S . cm -1 (anhydrous condition) at 200°C. These proton conductivities were mainly attributed to excess acid locked into the functionalized TiP structure, thus forming ionisable protons." @default.
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- W2046618323 date "2006-10-30" @default.
- W2046618323 modified "2023-10-10" @default.
- W2046618323 title "CHARACTERIZATION OF TITANIUM PHOSPHATE AS ELECTROLYTES IN FUEL CELLS" @default.
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- W2046618323 doi "https://doi.org/10.1142/s0217979206041008" @default.
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