Design and synthesis of hydroxide ion-conductive metal-organic frameworks based on salt inclusion

Masaaki Sadakiyo, Hidetaka Kasai, Kenichi Kato, Masaki Takata, Miho Yamauchi

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

We demonstrate a metal-organic framework (MOF) design for the inclusion of hydroxide ions. Salt inclusion method was applied to an alkaline-stable ZIF-8 (ZIF = zeolitic imidazolate framework) to introduce alkylammonium hydroxides as ionic carriers. We found that tetrabutylammonium salts are immobilized inside the pores by a hydrophobic interaction between the alkyl groups of the salt and the framework, which significantly increases the hydrophilicity of ZIF-8. Furthermore, ZIF-8 including the salt exhibited a capacity for OH- ion exchange, implying that freely exchangeable OH- ions are present in the MOF. ZIF-8 containing OH- ions showed an ionic conductivity of 2.3 × 10-8 S cm-1 at 25 C, which is 4 orders of magnitude higher than that of the blank ZIF-8. This is the first example of an MOF-based hydroxide ion conductor.

Original languageEnglish
Pages (from-to)1702-1705
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number5
DOIs
Publication statusPublished - Feb 5 2014

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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