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Immobilization of alkali metal ions in a 3D lanthanide-organic framework: selective sorption and H2 storage characteristics

journal contribution
posted on 2009-11-24, 00:00 authored by Sudip Mohapatra, K P S S Hembram, U Waghmare, T K Maji
A lanthanide-alkali (Ho III -K I ) bimetallic α-Po type 3D framework {KHo(C 2 O 4 ) 2 (H 2 O) 4 } n (1) (C 2 O 4 2- = oxalate dianion) has been synthesized and structurally characterized. Its dehydrated framework 1′, after removal of the K-bound water molecules, is found to exhibit permanent porosity with a clear size selective vapor sorption properties and H 2 storage capability. High heat of H 2 sorption (approximately - 10 kJ/mol) observed in experiment is shown to arise from the preferential interaction of H 2 with unsaturated K I sites decorated on the pore surfaces, using first-principles density functional theory-based calculations of energetics as well as the detailed structure. Our work shows that a material with better hydrogen storage and release properties can be developed through immobilization of unsaturated reactive alkali metal ions at the pore surfaces in a metal-organic framework.

History

Journal

Chemistry of materials

Volume

21

Issue

22

Pagination

5406 - 5412

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

0897-4756

eISSN

1520-5002

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2009, American Chemical Society