A metal-organic framework-based material for electrochemical sensing of carbon dioxide

Jeremiah J. Gassensmith, Jeung Yoon Kim, James M. Holcroft, Omar K. Farha, J. Fraser Stoddart*, Joseph T. Hupp, Nak Cheon Jeong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

161 Scopus citations


The free primary hydroxyl groups in the metal-organic framework of CDMOF-2, an extended cubic structure containing units of six Î-cyclodextrin tori linked together in cube-like fashion by rubidium ions, has been shown to react with gaseous CO2 to form alkyl carbonate functions. The dynamic covalent carbon-oxygen bond, associated with this chemisorption process, releases CO2 at low activation energies. As a result of this dynamic covalent chemistry going on inside a metal-organic framework, CO2 can be detected selectively in the atmosphere by electrochemical impedance spectroscopy. The as-synthesized CDMOF-2 which exhibits high proton conductivity in pore-filling methanolic media, displays a ∼550-fold decrease in its ionic conductivity on binding CO2. This fundamental property has been exploited to create a sensor capable of measuring CO2 concentrations quantitatively even in the presence of ambient oxygen.

Original languageEnglish (US)
Pages (from-to)8277-8282
Number of pages6
JournalJournal of the American Chemical Society
Issue number23
StatePublished - Jun 11 2014

ASJC Scopus subject areas

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

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