Dimethylethylammonium hydrogen sulfate ([DMEA][HSO4]) and 1-methylimidazoilum hydrogen sulfate ([MIM][HSO4]) as protic ionic liquids are intrinsically proton conductive due to available protons on both cations and anions. Protic ionogels are prepared via in situ radical copolymerization of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, and divinylbenzene in [DMEA][HSO4] and [MIM][HSO4] for fuel cell application. Ionogels could be stretched to twice their original length with a fracture stress of 20 kPa. Proton conduction in the protic ionogels is dominated by the vehicle mechanism and the conductivity reaches a maximum of 17.1 mS cm(-1) at 120 degrees C. The ionogel resulted from [MIM][HSO4] is thermally more stable than that from [DMEA][HSO4] and fabricated into an ionogel electrode assembly for a H-2/O-2 fuel cell. A single fuel cell exhibits a peak power density of 3.9 mW cm(-2) under nonhumidified conditions. In situ polymerization of vinyl monomers in protic ILs offers an efficient strategy to construct soft electrolytes toward proton conduction at elevated temperatures.