One-pot synthesis of inorganic/organic hybrid membranes from organoalkoxysilane, hydroimidazole derivative, and cyclic sulfonic acid ester

Koji Takahashi, Junji Umeda, Koichiro Hayashi, Wataru Sakamoto, Toshinobu Yogo

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Inorganic/organic hybrid membranes for use in fuel cells were synthesized from 3-glycidoxypropyltrimethoxysilane (GPTMS), N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole (NESPHI), and 1,3-propanesultone (PS) through a simple one-pot process. Fourier transform infrared spectroscopy and 13C nuclear magnetic resonance (NMR) measurements confirmed the sultone ring-opening reaction and formation of chemical bonds among the starting materials. The 29Si NMR measurements revealed that a siloxane network had formed within the hybrid membranes via the sol–gel process. The thermogravimetric analysis indicated that the synthesized membranes were thermally stable up to 170 °C. The conductivity of the membranes at low levels of relative humidity (RH) was improved by the addition of NESPHI. The best cell performance at intermediate temperatures and low RHs was achieved by the membrane electrode assembly using the NESPHI/GPTMS/PS = 1:3:4 hybrid membrane with a catalyst ink consisting of Nafion and the hybrid solution at a 1:1 ratio. At 120 °C and 53 % RH, the power density of the NESPHI/GPTMS/PS = 1:3:4 membrane was 6.6 mW/cm2.

Original languageEnglish
Pages (from-to)3398-3407
Number of pages10
JournalJournal of Materials Science
Volume51
Issue number7
DOIs
Publication statusPublished - Apr 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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