TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Parameters: Fuel cell operates at greater than or equal to 200 degrees C, preferably greater than or equal to 250 degrees C. Fuel cell achieves a power density of 184 mW/cm2 at 226 degrees C with hydrogen flow rate of 4.1 ml/minute.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Parameters: Fluid suspension is creamy in appearance. Fluid suspension scatters incident visible light. The liquid electrolyte is chemically unchanged after heating for 24 hours at less than or equal to 250 degrees C. The composition is in the form of a paste at room temperature and is soluble in water. The solid electrolyte is a rubbery solid. Solid electrolyte is chemically stable at less than or equal to 150 degrees C. Conductivity of solid electrolyte is greater than or equal to 200 mS/cm at 100 degrees C. Conductivity of liquid electrolyte is greater than or equal to 300 mS/cm at 200 degrees C. Conductivity of solid electrolyte at ambient temperature and humidity exceeds that of NAFION 115 (RTM: Sulfonated tetrafluoroethylene-based fluoropolymer-copolymer), and conductivity at 80 degrees C exceeds that of NAFION 115 in its 100% humidified form under 3.5 atm. Preferred Compositions: Phosphoric acid is formed from pure anhydrous phosphoric acid in the solid state. Fluid suspension is heated to a temperature sufficient, preferably greater than or equal to 250 degrees C, to yield molar ratio H4P2O7:H3PO4 of 0.1:1-0.8:1. Particulate solid contains greater than or equal to 2 different silicophosphoric acids. Silicophosphoric acid has ratio silicon:phosphorus of 1:2-1:4. Silicophosphoric acid contains 4-coordinate silicon atom having chemical structure of formula (I). Silicophosphoric acid has chemical formula of SiP2O8H2 or SiP2O8H2.(H3PO4)2. Silicophosphoric acid contains 6-coordinate silicon atom having chemical structure of formula (II). The paste contains residual H3PO4 and/or H4P2O7. The coated substrate is a proton conductive membrane. The solid electrolyte contains phosphoric acid and silicate or silicophosphate network. The phosphoric acid is within the silicate or silicophosphate network. The silicon in the silicate or silicophosphate network is a 4-coordinate silicon. Preferred Processes: Silicophosphoric acid is separated from liquid electrolyte to yield a composition containing silicophosphoric acid. Silicophosphoric acid is separated from liquid electrolyte by centrifuging the liquid electrolyte. The composition is combined with water to yield a homogeneous solution. A porous substrate containing a mesh is contacted with homogeneous solution. The homogeneous solution is treated by removing water from the solution to yield a gel. The gel is dried to yield a rubbery solid electrolyte.