Key Laboratory of Green Printing;
Institute of Chemistry;
Chinese Academy of Sciences;
Beijing 100190;
China;
School of Materials Science and Engineering;
Tianjin Polytechnic University;
Tianjin 300387;
China;
School of Chemistry and Chemical Engineering;
Beijing Institute of Technology;
Beijing 100081;
PR China;
Polybenzimidazole; Solvent; Acid doping level; Ion conductivity; Proton exchange membrane; Vanadium redox flow batteries;