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Moderate-temperature protonic conductors based on CsH2PO4 and modified silicon dioxide

Research paper by V. G. Ponomareva, E. S. Shutova

Indexed on: 01 May '07Published on: 01 May '07Published in: Russian Journal of Electrochemistry



Abstract

With the aim of creating an inert matrix for composite in the (1 − x) CsH2PO4 − xSiO2 system, the surface of finely divided dioxide is modified and matrices with more acid centers are produced. Physicochemical properties of composite systems on the basis of these are studied. The role played by acid centers in the formation of more stable and better conductive composite systems in the temperature interval 150 to 250°C is demonstrated. The conductivity of composites based on silicon dioxide modified with CsHSO4 or H3PO4 at 130–230°C is shown to exceed that of the initial phase CsH2PO4 and the composite systems based on uniformly porous silicon dioxide with the surface acidity pH ∼7 studied previously. The composites are of interest for further research. Compositions of phases under formation and conditions for their existence are determined.