Evaluation of the physi- and chemisorption of hydrogen in alkali (Na, Li) doped fullerenes

Journal Article · Sun Jan 11 00:00:00 EST 2015 · International Journal of Hydrogen Energy

DOI:https://doi.org/10.1016/j.ijhydene.2014.12.033· OSTI ID:1185649

Ward, Patrick A. ^[1]; Teprovich, Jr., Jospeph A. ^[2]; Compton, Robert N. ^[3]; Schwartz, Viviane ^[4]; Veith, Gabriel M. ^[4]; Zidan, Ragiay ^[2]

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1. Univ. of Tennessee, Knoxville, TN (United States); Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
2. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
3. Univ. of Tennessee, Knoxville, TN (United States)
4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, alkali doped fullerenes synthesized by two different solvent assisted mixing techniques are compared for their hydrogen uptake activity. In this study we investigated the interaction of hydrogen with alkali doped fullerenes via physisorption. In addition, we present the first mass spectrometric evidence for the formation of C₆₀H₆₀ via chemisorption. Hydrogen physisorption isotherms up to 1 atm at temperatures ranging from 77-303 K were measured demonstrating an increase in hydrogen uptake versus pure C₆₀ and increased isosteric heats of adsorption for the lithium doped fullerene Li₁₂C₆₀. However, despite these improvements the low amount of physisorbed hydrogen at 1 atm and 77 K in these materials suggests that fullerenes do not possess enough accessible surface area to effectively store hydrogen due to their close packed crystalline nature.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1185649
• Alternate ID(s): OSTI ID: 1361092
• Journal Information: International Journal of Hydrogen Energy, Vol. 40, Issue 6; ISSN 0360-3199
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
hydrogen storage
fullerenes
C60H60
physisorption
chemisorption