Abstract
High proton conductivity of CsHSO4 opened new opportunities for applications as electrolyte in solid acid fuel cells (SAFC). Relatively recent, it was proved that the accommodation of this solid electrolyte by silica supports improves its proton conductivity. During this work, solid acid CsHSO4 and its composites with mesoporous silica of SBA-15 and MCF-types as host materials were synthesized and studied for the first time. Studies were mainly focused on the influence of mesoporous support structure on the phase transition behavior of CsHSO4. The resulted solids were systematically characterized by powder XRD (low and high angle), nitrogen physisorption, FT-IR and thermal analysis (TG, DTA, DSC).