SYNTHESIS, CHARACTERIZATION AND APPLICATION IN PEMFC OF ZIRCONIUM OXO PHOSPHATE-SULFATE

<正> Mesoporous zirconium oxo phosphate-sulfate was synthesized by hydrothermal method with hexadecyltrithylammonium bromide（CTAB）as the template and with zirconium nitrate or zirconium oxychloride as zirconium source.The optimum two-stage process was established, 31P MAS NMR showed that the states of phosphate species were changed with further postsynthesis treatment by sulfate acid. The transformations of the structures at different temperatures from room temperature to 1173 K were investigated by XRD. The mesoporous structure could be retained up to 723 K. The proportion of tetragonal phase （T-ZrO2） to monoclinic phase （M-ZrO2） decreased with increasing temperature from 923 K to 1173 K. After the as-synthesized sample was treated by H3PO4 and H2SO4, T-ZrO2 kept predominant at wide temperature range. The performance of proton exchange membrane fuel cell （PEMFC） with the recast composite membrane of Nafion and zirconium oxo phosphonate-sulfurate has been investigated.