Mechanochemical synthesis of proton conductive composites derived from CESIUM DIHYDROGEN PHOSPHATE (cas 18649-05-3) and guanine

Add time:09/09/2019    Source:sciencedirect.com

Solid inorganic–organic composites were synthesized from CESIUM DIHYDROGEN PHOSPHATE (cas 18649-05-3) (CsH2PO4, CDP) and guanine (C5H5N5O, Gn) to use the solid proton conductive electrolytes. CDP and Gn were mechanochemically milled in dry nitrogen atmosphere to obtain composites with xCDP·(100 − x)Gn (x = 90–50 mol%). The changes in chemical structure, such as tautomerism of Gn and formation of hydrogen bond between CDP and Gn, after solid-state mechanochemical treatment, were confirmed from FT-IR study. The CDP-Gn composite electrolytes showed significantly higher proton conductivity than those of raw substances, particularly in the lower temperature region than the superprotic phase-transition temperature of CDP. The 80CDP·20Gn composite, for example, showed in anhydrous and hydrous proton conductivities from 2.4 × 10−5 to 8.1 × 10−4 S cm−1, in dry nitrogen atmosphere, and from 1.3 × 10−4 to 1.3 × 10−3 S cm−1, in humidified nitrogen atmosphere (pH2O = 0.6 atm) on heating in the temperature range between 80 and 180 °C. From the FT-IR and impedance studies, tautomerism of Gn and newly developed hydrogen bonds between CDP and Gn are highly expected in the composites. These structural changes imply that a development of new chemical interactions to form the acid–base composite cluster is essential to improve the proton conductivity.

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