查看完整版本: 【PNAS】Graphene nanostructures as tunable storage media for molecular hydrogen

【PNAS】Graphene nanostructures as tunable storage media for molecular hydrogen

Serguei Patchkovskii†, John S. Tse†‡, Sergei N. Yurchenko†, Lyuben Zhechkov§, Thomas Heine§, and Gotthard Seifert§
k)?XS!z2D/i †Steacie Institute for Molecular Sciences, National Research Council Canada, 100 Sussex Drive, Ottawa, ON, Canada K1A 0R6; and §Institut fu¨ r Physikalische+Z!BF7p%Aq*R
Chemie und Elektrochemie, Technische Universita¨ t Dresden, D-01062 Dresden, Germany
@Ll D$P)IV Edited by James L. Dye, Michigan State University, East Lansing, MI, and approved June 2, 2005 (received for review February 9, 2005)
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Many methods have been proposed for efficient storage of molecular hydrogen for fuel cell applications. However, despite intense research efforts, the twin U.S. Department of Energy goals of 6.5% mass ratio and 62 kg m3 volume density has not been achieved either experimentally or via theoretical simulations on reversible model systems. Carbon-based materials, such as carbon nanotubes, have always been regarded as the most attractive physisorption substrates for the storage of hydrogen. Theoretical studies on various model graphitic systems, however, failed to reach the elusive goal. Here, we show that insufficiently accurate carbon–H2 interaction potentials, together with the neglect and incomplete treatment of the quantum effects in previous theoretical investigations, led to misleading conclusions for the absorption capacity. A proper account of the contribution of quantum effects to the free energy and the equilibrium constant for hydrogen adsorption suggest that the U.S. Department of Energy specification can be approached in a graphite-based physisorption system. The theoretical prediction can be realized by optimizing the structures of nano-graphite platelets (graphene), which are lightweight, cheap, chemically inert, and environmentally benign.
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