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Fine-sized magnesium metaphosphate , calcium metaphosphate, or zinc metaphosphate glass powders were reacted with distilled water and hydration immediately occurred,resulting in the formation of hydrogels with high viscosity . 31P MAS -NMR spectra showed that the hydrogels contain orthophosph ates and l ong-chain phosphates coordinated to H+ or M2+(M=Mg , Ca, Zn) ion; no significant differences in their structures among the hydrogels were shown . The h ydrogels showed high proton conductivities of •`5 mS/cm at 30 °C . The conductivities were suggested to originate from proton conduction due to coexistence with large amounts of acidic P-OH groups and water molecules . El ectric double-layer capacitors (EDCs) were prepared by using electrolytes consisting of the hydrogels. They showed no oxidation-reduction processesin the range of 0-1 V. The EDCs showed specific capacity of •`2 F/g . The possibility as an EDC electrolyte may be related to proton conductivities of the hydrogels.

PREPARATION OF METAPHOSPHATE GLASS-DERIVED HYDROGELS AND THEIR ELECROCHEMICAL PROPERTIES AS ELECTRIC DOUBLE-LAYER CAPASITORS