COMPOSITE PROTON-CONDUCTING MATERIAL AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C01D17/00 C01B25/30 C01B25/36 C01F7/00 C30B28/04 C30B29/14 H01M8/22 

FIELD: chemistry.

SUBSTANCE: invention can be used in making proton-exchange membranes used in fuel cells based on hydrogen. Composite proton-conducting material has composition xCs₄(HSO₄)₃(H₂PO₄)-(1-x)AlPO₄, where x=0.5–0.9. Method of producing the composite material involves obtaining aluminum hydroxide in the process of alkaline hydrolysis of a solution of aluminum-ammonium alum in excess aqueous ammonia solution. Separation of residue Al(OH)₃⋅nH₂O, in which the value of the coefficient n is determined by determining the amount of water lost as a result of the formation of metahydroxide AlO(OH) when drying samples of freshly precipitated aluminum hydroxide. Neutralization of Al(OH)₃⋅nH₂O with phosphoric acid. Obtained solution is evaporated till consistence of thick syrup and the ground Cs₄(HSO₄)₃(H₂PO₄) crystal is dissolved in it at ratio Cs₄(HSO₄)₃(H₂PO₄):AlPO₄ in range from 9:1 to 1:1. Obtained mixture is cast into molds with subsequent drying at temperature of 60 °C for 12 hours.

EFFECT: invention enables to obtain material having high proton conductivity and low gas permeability.

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