Abstract
Polyvinyl alcohol (PVA)-based ion-exchange membranes are a promising group of materials for use in solid polymer fuel cells (SPFC) due to their high hydrophilicity, film forming ability, low cost, good mechanical properties and the possibility of crosslinking PVA with various chemicals. The compounds with a carboxyl or carbonyl functional group, such as polybasic acids and their anhydrides, were used as crosslinking agents resulting in the formation of a gel. Cross-linking reagents may contain ionic groups, for example, sulfonic, inducing the proton conductivity of PVA in membranes. Ceramic materials based on the oxides of aluminum, silicon, titanium, tin, zirconium, etc. serve as dopants in order to improve the technical characteristics of such membranes, such as to increase ionic conductivity, chemical and thermal stability, as well as the mechanical strength of the membranes. In this work, we report on the preparation of new biodegradable proton exchange membranes for SPFCs based on of polyvinyl alcohol crosslinked with sulfosuccinic acid and doped with beta zeolite particles. The content of zeolite in the composition of the membranes was varied from 1 to 25 %. The effect of the zeolite content on proton conductivity, ion-exchange capacity, moisture content, swelling coefficient, fuel (methanol) permeability and mechanical properties of membranes was studied. An increase in zeolite content from 1 to 25 % leads to an increase in the ion-exchange capacity of membranes from 1.5 to 2.9 mmol/g, a decrease in moisture content from 38 to 28 % and a methanol permeability from 2.27 10 -6 to 6.91 10 -7 cm 2 s -1 . The temperature dependence of the proton conductivity of composite membranes in the range from 30 to 80 oC at the relative humidity of 100 % was studied. The highest value of electrical conductivity was demonstrated by a membrane containing 25 % of BEA zeolite, whose proton conductivity was 23.2 mS·cm -1 .
Highlights
In this work, we report on the preparation of new biodegradable proton exchange membranes for solid polymer fuel cells (SPFC) based on of polyvinyl alcohol crosslinked with sulfosuccinic acid and doped with beta zeolite particles
The final manuscript has been read and approved by all the co-authors
Summary
Энергия активации протонного переноса и механические характеристики мембран. По сравнению с Nafion (Ea = 22,8 кДж моль-1) энергия активации протонного переноса для композитных мембран ПВС/СЯК/BEA немного выше и имеет значения 26–27 кДж моль-1 Protonconducting membrane based on epoxy resinpoly(vinyl alcohol)-sulfosuccinic acid blend and its nanocomposite with sulfonated multiwall carbon nanotubes for fuel-cell application. Application of a novel PVA-based proton exchange membrane modified by reactive black KN-B for low-temperature fuel cells. The synthesis and characterization of anhydrous proton conducting membranes based on sulfonated poly(vinyl alcohol) and imidazole. Preparation and characterization of crosslinked PVA/SiO2 hybrid membranes containing sulfonic acid groups for direct methanol fuel cell applications. Cross-linked poly(vinyl alcohol)/sulfonated nanoporous silica hybrid membranes for proton exchange membrane fuel cell. Effect of functionalized silica particles on cross-linked poly(vinyl alcohol) proton conducting membranes. SGO/SPES-based highly conducting polymer electrolyte membranes for fuel cell application.
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