NDLI: Proton-conducting electrolyte film of double-decker-shaped polyhedral silsesquioxane containing covalently bonded phosphonic acid groups

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Journal of Materials Chemistry Vol - 22 Issue - 8

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Journal of Materials Chemistry Vol -19

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Proton-conducting electrolyte film of double-decker-shaped polyhedral silsesquioxane containing covalently bonded phosphonic acid groups

Content Provider	Royal Society of Chemistry (RSC)
Author	Kucuk, Asuman C. Matsui, Jun Miyashita, Tokuji
Copyright Year	2012
Abstract	As described in this paper, phosphonic-acid-containing double-decker-shaped polyhedral silsesquioxane (PHOS-DDSQ) was synthesized and the proton conductivity of the PHOS-DDSQ cast film was studied under humid and non-humid conditions. To synthesize PHOS-DDSQ, double-decker-shaped polyhedral silsesquioxane (DDSQ) was initially reacted with di(ethylene glycol) (DEG) vinyl ether using hydrosilylation reaction to attach four DEG units to one DDSQ (4DEG-DDSQ). Subsequently, a phosphate esterification of hydroxyl groups in 4DEG-DDSQ was carried out using POCl3. NMR, XPS, and MALDI-TOF MS spectra and titration measurements revealed that the phosphate esterification connected two DEG units to form a crown-ether-like structure. This structure prevents hydrolysis of the phosphate ester bond. PHOS-DDSQ showed high thermal stability, with decomposition temperature exceeding 220 °C, because of its inorganic DDSQ core. A uniform film of PHOS-DDSQ can be fabricated by drop casting. The cast film showed high proton conductivity (0.12 S cm−1) under humid conditions, which is comparable to that of a Nafion® membrane. Moreover, the cast film offered good proton conductivity under non-humid conditions (3.6 × 10−4 S cm−1 at 170 °C). The conductivity and thermal stability indicate that PHOS-DDSQ is a good candidate for use as a proton-conductive membrane in hydrated type fuel cells as well as fuel cells operated at intermediate temperatures (100–200 °C) under non-humid conditions.
Starting Page	3853
Ending Page	3858
Page Count	6
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	9
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm15779a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DEG Proton Ethylene glycol Ether Hydrosilylation Phosphate Ester Hydroxy group Phosphoryl chloride Nuclear magnetic resonance Ionization Titration Hydrolysis Covalent bond Nafion
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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