Nanocomposite Proton Conductors Containing Mesoporous Oxides as the Promising Fuel Cell Membranes~1

摘要

Composite proton-conducting electrolytes are synthesized based on H_4SiW_(12)O_(40) · xH_2O, CsHSO_4, (CsH_2PO_4)_(0.9)(CsHSO_4)_(0.1) and mesoporous matrices SBA-15 and MCM-41 and their transport and structural characteristics are studied. Composites based on silicotungstic acid demonstrate the conductivity from ~10~(-3) to 10~(-4) S/cm in the temperature range of 25-140°C at the increased partial pressure of water vapor. The conductivity of systems CsHSO_4-SBA-15 (at T = 140-200°C) and (CsH_2PO_4)_(0.9)(CsHSO_4)_(0.1)-SBA-15 (at T = 200-230°C) reaches 10-2 S/cm and is independent of humidity. The electrolytes studied are promising as proton-exchange membranes of fuel cells operating at low and medium temperatures