PH-dependent proton conducting behavior in a metal-organic framework material

Won Ju Phang, Woo Ram Lee, Kicheon Yoo, Dae Won Ryu, Bongsoo Kim, Chang Seop Hong

Research output: Contribution to journalArticlepeer-review

171 Citations (Scopus)


A porous metal-organic framework (MOF), [Ni2(dobdc)(H 2O)2] 6H2O (Ni2(dobdc) or Ni-MOF-74; dobdc4-=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H+@Ni2(dobdc). At pH1.8, the acidified MOF shows proton conductivity of 2.2×10 -2Scm-1 at 80°C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H+@Ni2(dobdc) play an important role in the conduction process.

Original languageEnglish
Pages (from-to)8383-8387
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number32
Publication statusPublished - 2014 Aug 4


  • metal-organic frameworks
  • proton conducting materials
  • protonated water clusters

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis


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