Proton-conductive composites composed of phosphoric acid-doped silica gel and organic polymers with sulfo groups

Citation
A. Matsuda et al., Proton-conductive composites composed of phosphoric acid-doped silica gel and organic polymers with sulfo groups, J CERAM S J, 108(1), 2000, pp. 45-50
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
ISSN journal
0914-5400 → ACNP
Volume
108
Issue
1
Year of publication
2000
Pages
45 - 50
Database
ISI
SICI code
0914-5400(200001)108:1<45:PCCOPA>2.0.ZU;2-9
Abstract
Preparation of highly proton-conductive and thermoplastic composites was su ccessfully pursued from H3PO4-doped silica gel and organic polymers with su lfo groups. The sulfo groups and polystyrene blocks in the organic polymers were found to improve the proton conductivity and molding characteristics of the resultant composite, respectively. The composite composed of H3PO4-d oped silica gel with a molar ratio = 0.5 of H3PO4/SiO2 in 80 mass% and sulf onated styrene-isoprene-styrene (SIS-SO3H) block copolymer in 20 mass% show ed a high electrical conductivity of 10(-4) S.cm(-1) at 25 degrees C in dry N-2 atmosphere and good molding characteristics. The temperature dependenc e of the electrical conductivity of the composite was of the Vogel-Tamman-F ulcher type, indicating that proton transferred through a liquid-like phase present in the composites consisting of silica gel and organic polymer. Th e elastic modulus of the composite was larger by one to two orders of magni tude than that of the SIS-SO3H elastomer. The thermoplastically deforming t emperature of the composite was around 130 degrees C, which was higher by 5 0 degrees C than that of the SIS elastomer itself. The capacitance of a tot ally solid state electric double-layer capacitor, which was fabricated usin g the composite as a solid electrolyte, was comparable to those of the conv entional capacitors with liquid electrolytes.