Mechanochemical synthesis of highly proton conductive inorganic-organic composites in the oxo-acid salt-azole system

Abstract

Solid inorganic-organic composite electrolytes were mechanochemically synthesized from oxo-acid salt and azole for the application as an electrolyte in fuel cells. CsHSO4 (CHS) and CsH2PO4 (CDP) were used as an oxo-acid salt, and imidazole (Iz), 1,2,4-triazole (Tz), tetrazole (Tez) and benzimidazole (Bz) were used as an azole. The proton conductivity of the CHS- and CDP-Azole composite electrolytes was increased with an increase of azole contents, particularly in the lower temperature region than superprotonic transition temperatures of CHS and CDP.