Direct Evidence for Solid-like Hydrogen in a Nanoporous Carbon Hydrogen Storage Material at Supercritical Temperatures

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• 作者：Valeska P. Ting ; Anibal J. Ramirez-Cuesta ; Nuno Bimbo ; Jessica E. Sharpe ; Antonio Noguera-Diaz ; Volker Presser ; Svemir Rudic ; Timothy J. Mays
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：August 25, 2015
• 年：2015
• 卷：9
• 期：8
• 页码：8249-8254
• 全文大小：384K
• ISSN：1936-086X

文摘

Here we report direct physical evidence that confinement of molecular hydrogen (H₂) in an optimized nanoporous carbon results in accumulation of hydrogen with characteristics commensurate with solid H₂ at temperatures up to 67 K above the liquid鈥搗apor critical temperature of bulk H₂. This extreme densification is attributed to confinement of H₂ molecules in the optimally sized micropores, and occurs at pressures as low as 0.02 MPa. The quantities of contained, solid-like H₂ increased with pressure and were directly evaluated using in situ inelastic neutron scattering and confirmed by analysis of gas sorption isotherms. The demonstration of the existence of solid-like H₂ challenges the existing assumption that supercritical hydrogen confined in nanopores has an upper limit of liquid H₂ density. Thus, this insight offers opportunities for the development of more accurate models for the evaluation and design of nanoporous materials for high capacity adsorptive hydrogen storage.