First-principles plane wave calculations predict that Li can be adsorbed on graphene forming a uniform and stable coverage on both sides. A significant part of the electronic charge of the Li-2s orbital is donated to graphene and is accommodated by its distorted π∗-bands. As a result, semimetallic graphene and semiconducting graphene ribbons change into good metals. It is even more remarkable that Li covered graphene can serve as a high-capacity hydrogen storage medium with each adsorbed Li absorbing up to four H2 molecules amounting to a gravimetric density of 12.8 wt%.
@article{arxiv.0901.1944,
title = {High-capacity hydrogen storage by metallized graphene},
author = {C. Ataca and E. Akturk and S. Ciraci and H. Ustunel},
journal= {arXiv preprint arXiv:0901.1944},
year = {2009}
}