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

Patrick A. Ward; Joseph A. Teprovich; R. N. Compton; Viviane Schwartz; Gabriel M. Veith; Ragaiy Zidan

doi:10.1016/j.ijhydene.2014.12.033

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

Patrick A. Ward, Joseph A. Teprovich, R. N. Compton, Viviane Schwartz, Gabriel M. Veith, Ragaiy Zidan

Energy Storage & Conversion

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

In this study, alkali doped fullerenes synthesized by two different solvent assisted mixing techniques are compared for their hydrogen uptake activity. In particular, we investigated the interaction of hydrogen with lithium and sodium 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 K to 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. The hydrogen uptake in Na₆C₆₀, Li₆C₆₀, and Li₁₂C₆₀ was enhanced compared to pure C₆₀. 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.

Original language	English
Pages (from-to)	2710-2716
Number of pages	7
Journal	International Journal of Hydrogen Energy
Volume	40
Issue number	6
DOIs	https://doi.org/10.1016/j.ijhydene.2014.12.033
State	Published - Feb 19 2015

Funding

This research was supported by National Science Foundation Grant DGE0801470 , “Sustainable Technology through Advanced Interdisciplinary Research” (STAIR), awarded to the University of Tennessee Knoxville. Work at SRNL was supported by the U.S. Department of Energy , Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. XPS studies (GMV) were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Hydrogen physisorption measurements were carried out at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.

Keywords

CH
Chemisorption
Fullerenes
Hydrogen storage
Physisorption

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

abstract = "In this study, alkali doped fullerenes synthesized by two different solvent assisted mixing techniques are compared for their hydrogen uptake activity. In particular, we investigated the interaction of hydrogen with lithium and sodium 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 K to 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. The hydrogen uptake in Na6C60, Li6C60, and Li12C60 was enhanced compared to pure C60. 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.",

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author = "Ward, {Patrick A.} and Teprovich, {Joseph A.} and Compton, {R. N.} and Viviane Schwartz and Veith, {Gabriel M.} and Ragaiy Zidan",

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AU - Ward, Patrick A.

AU - Teprovich, Joseph A.

AU - Compton, R. N.

AU - Schwartz, Viviane

AU - Veith, Gabriel M.

AU - Zidan, Ragaiy

PY - 2015/2/19

Y1 - 2015/2/19

N2 - In this study, alkali doped fullerenes synthesized by two different solvent assisted mixing techniques are compared for their hydrogen uptake activity. In particular, we investigated the interaction of hydrogen with lithium and sodium 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 K to 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. The hydrogen uptake in Na6C60, Li6C60, and Li12C60 was enhanced compared to pure C60. 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.

AB - In this study, alkali doped fullerenes synthesized by two different solvent assisted mixing techniques are compared for their hydrogen uptake activity. In particular, we investigated the interaction of hydrogen with lithium and sodium 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 K to 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. The hydrogen uptake in Na6C60, Li6C60, and Li12C60 was enhanced compared to pure C60. 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.

KW - CH

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KW - Physisorption

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ER -

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

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