TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The electron donor functional group-containing compound is present in an amount of 0.01-50 wt.parts. The electron donor functional group-containing compound has a melting point of 100 degrees C or more and a boiling point of 200 degrees C or less. The acidic functional group is a carboxylic acid group, a phosphonic acid group, sulfonic acid group or a sulfamic acid group. The acidic functional group is a sulfonic acid group or a sulfamic acid group. The electron donor functional group of the electron donor functional group-containing compound is an amide, an ether, an amino, a hydroxyl, a thioether, a 1-20C alkyl or a halogen group. The electron donor functional group-containing compound is: decyl amine, undecyl amine, dodecyl amine, tridecyl amine, tridodecyl amine, pentadecyl amine, decylaniline, 4-butylaniline, 1-decanol, 2-decanol, 1-undecanol, 1-dodecanol, 2-dodecanol, 1-tridecanol, 1-tetradecanol, 2-tetradecanol, 2-hexadecanol, 2-hexyl-1-decanol, heptadecanol, 1,10-decandiol, 1,2-decandiol, 1,12-dodecandiol, 1,2-tetradecandiol, 1,14-tetradecandiol, 1-decanthiol, 1 -undecanthiol or 1-pentadecanthiol; diethyl dodecanoic acid amide, diethyl octadecanoic acid amide, diethyl benzamide, diethyl-4-heptylbenzamide, diphenylether, ethylphenylether or cyclohexylphenylether. In the process, the used acidic functional group-containing aromatic hydrocarbon polymer is a polyamidic acid derivative containing sulfamic acid groups and the used solvent is dimethylformamide, N,N'-dimethylacetamide, N-methylpyrrolidone or dimethylsulfoxide. At least one of the pair of electrodes includes a binder comprising the acidic functional group-containing aromatic hydrocarbon polymer and the electron donor functional group-containing compound.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The acidic functional group-containing aromatic hydrocarbon polymer is a polyamidic acid derivative of formula (-(NH-C(=O)-Ar1(COOH)b(CONHSO3)a-(C=O)-NH-R)n-) (I) or a polyamidic acid derivative of formula (II). The acidic functional group-containing aromatic hydrocarbon polymer is a heat-resistant polymer, preferably polyetherketone, polyether-sulfone, polyphenylene ether, polyphenylenesulfide, polyimide or polybenzoxazole.Ar1 = an aromatic ring or an aromatic ring-containing functional group, preferably phenyl or naphthyl group;R = 1-20C alkylene group;a = greater than 0 to less than or equal to 2, which is an average per monomer of CONHSO3H;b = greater than or equal to 0 to less than 2, which is an average per monomer of COOH; andm, n = 100-10000, which is an average polymerization degree. EXAMPLE - Polyamidic acid (1.17 g), which was prepared by dissolving 1,10-diaminodecane (3.45 g) in anhydrous N,N'-dimethylformamide (170 ml) and pyromelliticanhydride (4.36 g) was dissolved in anhydrous dimethyl formamide (100 ml) and thionyl chloride (1.78 g) to prepare a polymer solution. Then sulfamic acid triethylamine salt was added to the polymer solution and further processed to obtain a polyamidic acid derivative of formula (Ia). The polyamidic acid derivative (0.95 g) and diethyldodecanoic acid amide (0.05 g) were dissolved in dimethylformamide (9 g) and the resultant solution was cast at 60 degrees C to form a thin brown membrane having thickness of 50 mu m, thus, a proton conductive polymer electrolyte was prepared.