Characterization of proton conducting CsHSO4–CsH2PO4 ionic glasses prepared by the melt-quenching method

Proton conducting ionic glasses which consist of only isolated ions were successfully prepared from only CsHSO4 and the mixture of CsHSO4 and CsH2PO4 by melt-quenching technique. The 50CsHSO4·50CsH2PO4 glass showed the conductivity of 4.2 × 10− 6 S cm− 1 at room temperature. The 50CsHSO4·50CsH2PO4 glass exhibited much higher ionic conductivity than CsHSO4 and Cs2(HSO4)(H2PO4) crystals in a relatively wide temperature range of ambient to 90 °C under dry Ar atmosphere, indicating that vitrification of CsHSO4-based solid acids is effective in enhancing their conductivity.