Intermediate temperature proton electrolytes based on cesium dihydrogen phosphate and poly(vinylidene fluoride-co-hexafluoropropylene)

Proton conductivity, morphology, phase composition and mechanical properties of (1-x)CsH 2 PO 4 -xp(VDF/HFP) ( x  = 0.05–0.25, weight ratio) polymer electrolytes were investigated for the first time. The chemical interaction of the organic matrix and acid salt was not observed and crystal structure...

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Bibliographic Details
Published in:Journal of materials science 2021-09, Vol.56 (25), p.14196-14206
Main Authors: Bagryantseva, Irina N., Ponomareva, Valentina G., Khusnutdinov, Vyacheslav R.
Format: Article
Language:English
Subjects:
Cesium
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Conductors
Crystal structure
Crystallography and Scattering Methods
Crystals
Diamond pyramid hardness
Electric properties
Electrolytes
Electrolytic cells
Energy Materials
Fuel cells
Materials Science
Mechanical properties
Membranes
Morphology
Percolation
Phase composition
Phosphates
Polyelectrolytes
Polymer Sciences
Polymers
Protons
Solid Mechanics
Structure
Vinylidene
Vinylidene fluoride
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Summary:Proton conductivity, morphology, phase composition and mechanical properties of (1-x)CsH 2 PO 4 -xp(VDF/HFP) ( x  = 0.05–0.25, weight ratio) polymer electrolytes were investigated for the first time. The chemical interaction of the organic matrix and acid salt was not observed and crystal structure of CsH 2 PO 4 was preserved. A method for the synthesis of thin membranes with uniform distribution of the components was proposed. Thin flexible membranes with uniform distribution of sub-micrometer CsH 2 PO 4 particles in the polymer membranes and improved hydrolytic stability were obtained firstly by using a bead mill. The mechanical strength of the hybrid polymer compounds was determined using the Vickers microhardness measurements. Proton conductivity in the (1-x)CsH 2 PO 4 -xp(VDF/HFP) electrolytes decreases monotonically with x increase due to the «conductor–insulator» percolation. Nevertheless, the values of proton conductivity remain sufficiently high, and along with small thickness, flexibility, improved mechanical and hydrophobic properties, it makes polymer electrolytes based on CsH 2 PO 4 promising for membranes of medium-temperature fuel cells. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-021-06137-0