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Adsorption and desorption of hydrogen on metal-organic framework materials for storage applications: comparison with other nanoporous materials

Lookup NU author(s): Emeritus Professor Mark Thomas

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Abstract

Hydrogen adsorption on porous materials is one of the possible methods proposed for hydrogen storage for transport applications. High pressure experimental studies of a wide range of porous materials have obtained maximum hydrogen excess capacities of 6-8 wt% at 77 K for metal-organic frameworks (MOFs) and porous carbon materials. Grand canonical Monte Carlo (GCMC) simulation studies indicate that higher hydrogen capacities are possible for covalent organic frameworks (COFs). Currently, the maximum isosteric enthalpies of adsorption of similar to 13 kJ mol(-1) at 77 K have been observed experimentally for metal-organic framework materials and this is higher than for COFs, where the maximum predicted from GCMC simulations is similar to 8 kJ mol(-1). Metal-organic framework materials have structural diversity and scope for modi. cation of surface chemistry to enhance hydrogen surface interactions. The synthesis of MOFs with stronger H-2-surface interactions to give similar hydrogen capacities at much higher temperatures than 77 K is required and eventually, materials that have these high capacities at ambient temperatures with rapid adsorption/desorption characteristics are necessary for applications as hydrogen storage materials for transport applications. The current methods envisaged for increasing adsorption at higher temperatures involve modi. cation of the surface chemistry, in particular, the inclusion of open metal centres to increase hydrogen surface site interactions, and utilisation of the framework flexibility are discussed.


Publication metadata

Author(s): Thomas KM

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2009

Volume: 2009

Issue: 9

Pages: 1487-1505

Print publication date: 01/01/2009

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/b815583f

DOI: 10.1039/b815583f


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