A method for bonding together two or more acid-doped polybenzimidazole films is provided. The method includes, in the following order: placing a first acid-doped polybenzimidazole film on a first substrate to form a first film/substrate assembly and placing a second acid-doped polybenzimidazole film on a second substrate to form a second film/substrate assembly; heating the first and second film/substrate assemblies to a temperature sufficient to soften the first and second acid-doped polybenzimidazole films; positioning the second film/substrate assembly atop the first film/substrate assembly, such that polybenzimidazole polymer chains of the first acid-doped polybenzimidazole film interact with polybenzimidazole polymer chains of the second acid-doped polybenzimidazole film; and re-hydrolyzing the first and second acid-doped polybenzimidazole films, such that the polybenzimidazole polymer chains of the first and second acid-doped polybenzimidazole films are therefore reformed and interlocked with each other to bond together the first and second acid-doped polybenzimidazole films.