NOVELTY - Preparation of an electrolyte material for solid acid fuel cell, involves dissolving solid acid material (m1) in water to form saturated aqueous solution (s1); injecting (s1) into solvent (t1) in which the solid acid is not soluble to form an injection solution (s2); allowing (s2) to stand for at least one day to allow (m1) to settle in the solvent, creating a settled solution (s3); and decanting (s3) with a slightly polar solvent (t2) to isolate the solid acid particles.    USE - For preparation of an electrolyte material for a solid acid fuel cell (claimed).    ADVANTAGE - The method fabricates high performance solid acid fuel cell membrane electrode assemblies. The solid acids when used in fuel cell applications, exhibit superprotonic phases in which the solid has disorder in its crystal structure and very high proton conductivity.    DETAILED DESCRIPTION - Preparation (P1) of an electrolyte material for solid acid fuel cell, involves dissolving solid acid material (m1) in water to form saturated aqueous solution (s1); injecting (s1) into solvent (t1) in which the solid acid is not soluble to form an injection solution (s2); allowing (s2) to stand for at least one day to allow (m1) to settle in the solvent, creating a settled solution (s3); decanting (s3) with a slightly polar solvent (t2) to isolate the solid acid particles (p1). (t1) is methanol, ethanol, isopropanol, benzene, toluene or acetone. (t2) is methanol, ethanol, isopropanol or butanol.    INDEPENDENT CLAIMS are included for the following:    (1) preparation (P2) of an electrolyte material for a solid acid fuel cell involving spraying an aqueous solution of (m1) through a heat source (preferably laser beam or flame) creating particle of solid acid byproduct; placing the byproduct particles in an atmosphere having a relative humidity of 30 - 100% at 25 - 200degreesC, where the humidity of the atmosphere hydrates the solid acid byproduct creating solid acid particles;    (2) a method (P3) of depositing an electrolyte on a substrate involving preparing (p1); sifting the particles onto the substrate; leveling the particles on the substrate; and flattening the particles on the substrate;    (3) a method (P4) of depositing an electrolyte on a substrate involving preparing (p1); mixing with an organic solvent to form a slurry and continuing to mix the slurry until the particles remain dispersed in the solvent without settling out of the solvent for 1 minute - 1 day; applying the slurry to the substrate; and allowing the solvent to evolve;    (4) a method (P5) of depositing an electrolyte on a substrate, involving preparing (p1); dispersing in a polar solvent to form a first dispersion; mixing the first dispersion with a non-polar solvent to form a stable gel; depositing the gel onto the substrate; and allowing the solvents to evolve;    (5) a method (P6) of depositing an electrolyte on a substrate involving preparing (p1); preparing an aqueous solution of (p1) in water; depositing the aqueous solution on the substrate; and allowing the water to evolve;    (6) a method (P7) of depositing an electrolyte on a substrate involving preparing (p1); suspending (p1) in a solvent (preferably organic solvent or water) to form a suspension; spraying the suspension onto the substrate; and allowing the solvent to evolve;    (7) a method (P8) of depositing an electrolyte on a substrate, involving preparing (p1); suspending (p1) in a solvent (preferably organic solvent or water) to form a suspension; depositing the suspension in the center of the substrate, where the substrate is continuously spinning to create centripetal force, which spreads the suspension radially outwardly from the center of the substrate to distribute the suspension over the entire substrate;    (8) a method (P9) of depositing an electrolyte on a substrate involving preparing (p1); suspending in a solvent to form a suspension; dipping a porous monolith into the suspension; and allowing the solvent to evaporate;    (9) a fuel cell comprising an anode; a cathode; an electrolyte comprising a solid acid material; and a catalyst layer deposited on at least one of the anode and cathode, the catalyst layer comprising a material selected from noble metal, base metal and/or ceramic;;    (10) preparation (P10) of particles of an electrocatalyst layer for a solid acid fuel cell involving preparing a mixture of a solid acid electrolyte material, a catalyst material and a pore-former; and milling the mixture;    (11) preparation (P11) of particles of an electrocatalyst layer for a solid acid fuel cell involving co-precipitating an organo-catalyst with a solid acid electrolyte material to form a co-precipitate; applying the co-precipitate to at least one of an anode and cathode of the fuel cell; and burning off the organic component of the organo-catalyst;    (12) a method of sealing a fuel cell comprising a solid acid electrolyte layer and a glass (preferably quartz and amorphous SiO2) layer, involving melting the solid acid layer to the glass layer, to create a gas tight seal;and    (13) a method of sealing a fuel cell comprising an anode, a cathode and a solid acid electrolyte layer involving applying a sealant (preferably ceramic, thermoplastic and silicone) to at least one of the anode, cathode and solid acid electrolyte layer.