Characterization of mechanochemically synthesized MHSO4-H4SiW12O40 composites (MÂ =Â K, NH4, Cs)

► Mechanochemical synthesis of various MHSO4-H4SiW12O40 (MHS-STA, M = K, NH4, Cs) composites as an electrolyte. ► Anhydrous proton conductive electrolytes under ambient pressure for fuel cells. ► Chemical interaction via ion-exchange and hydrogen bond between MHS and STA.