Bagryantseva, I.; Ponomareva, V.; Kungurtsev, Y. High-Conductive CsH2PO4 Membranes with PVDF-Based Polymers Additives. Membranes2023, 13, 617.
Bagryantseva, I.; Ponomareva, V.; Kungurtsev, Y. High-Conductive CsH2PO4 Membranes with PVDF-Based Polymers Additives. Membranes 2023, 13, 617.
Bagryantseva, I.; Ponomareva, V.; Kungurtsev, Y. High-Conductive CsH2PO4 Membranes with PVDF-Based Polymers Additives. Membranes2023, 13, 617.
Bagryantseva, I.; Ponomareva, V.; Kungurtsev, Y. High-Conductive CsH2PO4 Membranes with PVDF-Based Polymers Additives. Membranes 2023, 13, 617.
Abstract
The proton conductivity, phase composition and mechanical properties of (1-x)CsH2PO4–x fluoropolymer electrolytes (x-mass fraction, x=0-0.3) have been investigated firstly and discussed. UPTFE and PVDF-based polymers (F2M, F42, SKF26) with the high mechanical properties and thermal stability have been chosen as a fluoropolymer additive. According the XRD data, a monoclinic CsH2PO4 (P21/m) phase is retained in all compositions of the polymer electrolytes studied. The conductivity of (1-x)CsH2PO4-x fluoropolymer in the high-temperature phase decreases by approximately one order of magnitude compared with the pure CsH2PO4 for x~0.15-0.20. The size and shape of CsH2PO4 particles and their distribution have been shown to affect significantly the proton conductivity and mechanical properties of the membranes. The thin-film composite systems were produced by various methods of the obtaining salt particles, their mixing and applying to a polymer matrix. The uniform distribution of particles in the polymer systems with the size of ~300 nm was achieved by a pretreatment of the suspension in a bead mill. CsH2PO4-based mechanically strong membranes with the thickness ~50–100 μm were obtained for the soluble fluoropolymers (F2M, F42, SKF26). With an increase in the mass fraction of the polymer the ability of the membranes to resist the plastic deformation and the mechanical strength increases and comparable to the best low temperature membranes. The proton-conducting membranes (1-x)CsH2PO4 – x fluoropolymer with the optimal combination of the conductivity, mechanical and hydrophobic properties are promising for use in solid acid fuel cells.
Chemistry and Materials Science, Polymers and Plastics
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