US 11,970,589 B2Granted

Composite proton conductive membranes

AssigneeUop LLC

InventorsChunqing Liu, Xueliang Dong, Chaoyi Ba

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Abstract

A composite proton conductive membrane, comprising an inorganic filler having covalently bonded acidic functional groups and a high surface area of at least 150 m2/g; and a water insoluble ionically conductive polymer. This membrane provides advantages over traditional polymeric proton conductive membranes for redox flow battery, fuel cell, and electrolysis applications include: 1) enhanced proton conductivity/permeance due to the formation of additional nanochannels for proton conducting; 2) improved proton/electrolyte selectivity for redox flow battery application; 3) reduced membrane swelling and gas or electrolyte crossover; 4) improved chemical stability; 5) increased cell operation time with stable performance, and 6) reduced membrane cost.

Claims13

Dependent claims

A composite proton conductive membrane, comprising:

an inorganic filler having covalently bonded acidic functional groups and a high surface area of at least 150 m2/g;
a water insoluble ionically conductive polymer;
and
a microporous support membrane, wherein the inorganic filler is selected from the group consisting of a metal-organic framework, a zeolitic imidazolate framework, a covalent organic framework and a combination thereof;
and
wherein the water insoluble ionically conductive polymer is selected from a group consisting of a polysaccharide polymer, a cross-linked polysaccharide polymer, a metal ion-complexed polysaccharide polymer, an acid-complexed polysaccharide polymer, a cross-linked poly(acrylic acid) polymer, a metal ion-complexed poly(acrylic acid) polymer, an acid-complexed poly(acrylic acid) polymer, a cross-linked poly(methacrylic acid), a metal ion-complexed poly(methacrylic acid), an acid-complexed poly(methacrylic acid), and combinations thereof.

3 more elements

Dependencies are inferred from the claim text.