General relationship between hydrogen adsorption capacities at 77 and 298 K and pore characteristics of the porous adsorbents

Seung Jae Yang, Ji Hyuk Im, Hirotomo Nishihara, Haesol Jung, Kunsil Lee, Takashi Kyotani, Chong Rae Park

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

The hydrogen adsorption isotherms of six metal-organic frameworks (MOFs) and three microporous carbons, measured at 77 K (up to 1 bar) and 298 K (up to 100 bar), have been systematically examined for correlations with their pore characteristics. From the obtained correlations, H 2 adsorption was found to occur preferentially in ultrafine pores at both 77 K (1 bar) and 298 K (100 bar), irrespective of the adsorbent. This represents the first experimental evidence that ultrafine pores in MOFs improve the efficiency of H 2 adsorption at 298 K and at high pressures, indicating that that the low H 2 storage capacities of reported ultrahigh microporous MOFs at 298 K result from the prominence of micropores with diameters 1-2 nm, which are inadequate at 298 K and high pressures. Furthermore, these correlations suggest strong links between the H 2 storage capacities at 77 and 298 K, which offer an easy method for predicting H 2 adsorption capacities under unapproachable conditions. This study provides guidance in the development of new MOFs or other adsorbents with an optimized H 2 storage capacity at near-ambient temperatures and a swift screening method of newly synthesized porous adsorbents.

Original languageEnglish
Pages (from-to)10529-10540
Number of pages12
JournalJournal of Physical Chemistry C
Volume116
Issue number19
DOIs
Publication statusPublished - 2012 May 17

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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