Presursor Organic of Tetravalent Metal Phosphates and Pyrophosphates and Their Use for Electrode Modification and for the Preparation of Composite Membrane for Fuel Cells Working at Temperatures>90c and / or at Low Relative Humidity
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United States of America Patent
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Issued Date -
Sep 27, 2007
app pub date -
Aug 18, 2004
filing date -
Apr 30, 2004
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Abandoned
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Abstract
The invention is based on the preparation of precursor organic solutions of tetravalent metal phosphates and pyrophosphates with composition M(IV)(O.sub.3P--H).sub.2, M(IV)[O.sub.2P(OH).sub.2].sub.2[O.sub.2PO(OH)] and M(IV)P.sub.2O.sub.7(M=Zr, Hf, Ti). An important property of these solutions is that the said compounds are formed when the solvent is evaporated. This peculiarity allows an easy insertion of the compounds inside the pores of porous membranes, in polymeric membranes and in the electrodic interfaces of fuel cells. The acid properties of their surfaces, the high thermal stability and the insolubility in water make these particles extremely of interest for improving the efficiency of PEMFCs in the temperature range 90-130.degree. C. The peculiar characteristics of non-water assisted proton conductivity of M(IV)[O.sub.2P(OH).sub.2].sub.2[O.sub.2PO(OH)] compounds open new prospects for their application in PEMFCs at low relative humidity.
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