Effect of surface oxygen groups in carbons on hydrogen storage by spillover / Lifeng Wang in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2920–2926 Titre : Effect of surface oxygen groups in carbons on hydrogen storage by spillover Type de document : texte imprimé Auteurs : Lifeng Wang, Auteur ; Frances H. Yang, Auteur ; Ralph T. Yang, Auteur Année de publication : 2009 Article en page(s) : pp. 2920–2926 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Carbon materials Hydrogen adsorption Pd nanoparticles Résumé : Hydrogen adsorption properties of two different carbon materials (superactivated carbon, AX-21, and graphite oxide) doped with Pd nanoparticles have been studied. The effect of surface oxygen groups in AX-21 on hydrogen storage was investigated, and the results showed Pd supported on oxygen-modified AX-21 (Pd/AX-21-O) had a higher hydrogen storage capacity than Pd supported on unmodified AX-21 (Pd/AX-21). Overall heats of adsorption were obtained from the temperature dependence of the isotherms, and higher values were shown on the oxygen-modified AX-21 sample than the unmodified one, showing that the surface oxygen groups were favorable for hydrogen adsorption. Furthermore, a sample comprising Pd supported on graphite oxide with more surface oxygen (Pd/graphite oxide) was studied. The hydrogen adsorption on this sample showed a hydrogen storage capacity of 0.95 wt % at 100 atm and 298 K. Normalized by the BET surface area, the Pd/graphite oxide exhibited 2.8× the storage capacity of Pd/AX-21-O and 3.4× that of the Pd/AX-21 sample. Molecular orbital calculations showed that the presence of oxygen groups increased the binding energies of the spiltover H on graphite, which is consistent with the experimental results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014507 [article] Effect of surface oxygen groups in carbons on hydrogen storage by spillover [texte imprimé] / Lifeng Wang, Auteur ; Frances H. Yang, Auteur ; Ralph T. Yang, Auteur . - 2009 . - pp. 2920–2926. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2920–2926 Mots-clés : Carbon materials Hydrogen adsorption Pd nanoparticles Résumé : Hydrogen adsorption properties of two different carbon materials (superactivated carbon, AX-21, and graphite oxide) doped with Pd nanoparticles have been studied. The effect of surface oxygen groups in AX-21 on hydrogen storage was investigated, and the results showed Pd supported on oxygen-modified AX-21 (Pd/AX-21-O) had a higher hydrogen storage capacity than Pd supported on unmodified AX-21 (Pd/AX-21). Overall heats of adsorption were obtained from the temperature dependence of the isotherms, and higher values were shown on the oxygen-modified AX-21 sample than the unmodified one, showing that the surface oxygen groups were favorable for hydrogen adsorption. Furthermore, a sample comprising Pd supported on graphite oxide with more surface oxygen (Pd/graphite oxide) was studied. The hydrogen adsorption on this sample showed a hydrogen storage capacity of 0.95 wt % at 100 atm and 298 K. Normalized by the BET surface area, the Pd/graphite oxide exhibited 2.8× the storage capacity of Pd/AX-21-O and 3.4× that of the Pd/AX-21 sample. Molecular orbital calculations showed that the presence of oxygen groups increased the binding energies of the spiltover H on graphite, which is consistent with the experimental results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014507

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