Ab initio study of hydrogen adsorption on benzenoid linkers in metal-organic framework materials

Yi Gao, X. C. Zeng

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Abstract

We have computed the energies of adsorption of molecular hydrogen on a number of molecular linkers in metal-organic framework solid materials using density functional theory (DFT) and ab initio molecular orbital methods. We find that the hybrid B3LYP (Becke three-parameter Lee-Yang-Parr) DFT method gives a qualitatively incorrect prediction of the hydrogen binding with benzenoid molecular linkers. Both local-density approximation (LDA) and generalized gradient approximation (GGA) DFT methods are inaccurate in predicting the values of hydrogen binding energies, but can give a qualitatively correct prediction of the hydrogen binding. When compared to the more accurate binding-energy results based on the ab initio Møller-Plesset second-order perturbation (MP2) method, the LDA results may be viewed as an upper limit while the GGA results may be viewed as a lower limit. Since the MP2 calculation is impractical for realistic metal-organic framework systems, the combined LDA and GGA calculations provide a cost-effective way to assess the hydrogen binding capability of these systems.

Original languageEnglish (US)
Article number386220
JournalJournal of Physics Condensed Matter
Volume19
Issue number38
DOIs
StatePublished - Sep 26 2007

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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