Hydrogen Mobility on Graphene (Recent publication in Nano Letters)

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We identify a molecular fingerprint to probe H mobility on catalyzed carbon surfaces and confirm a weak carbon-hydrogen chemical bond may form reversibly at ambient temperature.1  We elucidate surface properties that lead to high mobility, and demonstrate reversibility requires mobility back to the catalyst.  Our technique extends prior ex post facto evidence of hydrogen spillover to carbon materials, by probing the carbon-hydrogen bond in situ, at high pressure and ambient temperature.  The results clarify a mechanism that has been disputed in recent years, as experimental reports claiming combined ambient temperature reversibility and mobility seem to defy theoretical predictions of the nature and strength of the carbon-hydrogen bond and have not been easily substantiated. Beyond hydrogen storage, clarification of the mechanism by which hydrogen diffuses on carbon extends to basic surface science, catalysis, astrophysics, novel materials, energy storage devices, and electronics. 

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(1)  Liu, X. M.; Tang, Y.; Xu, E. S.; Fitzgibbons, T. C.; Larsen, G. S.; Gutierrez, H. R.; Tseng, H. H.; Yu, M. S.; Tsao, C. S.; Badding, J. V.; Crespi, V. H.; Lueking, A. D. (Corresponding Author) Nano Lett. 13, 137-141, 2013.DOI: 10.1021/nl303673z; http://pubs.acs.org/doi/abs/10.1021/nl303673z

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