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Line 22f1fa19c3k2 Electrochemical Hydrogen Storage Carbon Nanotubes 5g WOW SETI

October 16, 2012

Line 22f1fa19c3k2 Electrochemical Hydrogen Storage Carbon Nanotubes 5g WOW SETI

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Hydrogen Storage

Science 5 November 1999: 
Vol. 286 no. 5442 pp. 1127-1129 
DOI: 10.1126/science.286.5442.1127
Hydrogen Storage in Single-Walled Carbon Nanotubes at Room Temperature
1. C. Liu1, 
2. Y. Y. Fan1, 
3. M. Liu1, 
4. H. T. Cong2, 
5. H. M. Cheng1,*, 
6. M. S. Dresselhaus3,*
+Author Affiliations
7. 1 Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, China.
8. 2 State Key Lab for Rapidly Solidified Non-equilibrium Alloys, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, China.
9. 3 Department of Physics and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Masses of single-walled carbon nanotubes (SWNTs) with a large mean diameter of about 1.85 nanometers, synthesized by a semicontinuous hydrogen arc discharge method, were employed for hydrogen adsorption experiments in their as-prepared and pretreated states.

A hydrogen storage capacity of 4.2 weight percent, or a hydrogen to carbon atom ratio of 0.52, was achieved reproducibly at room temperature under a modestly high pressure (about 10 megapascal) for a SWNT sample of about 500 milligram weight that was soaked in hydrochloric acid and then heat-treated in vacuum.

Moreover, 78.3 percent of the adsorbed hydrogen (3.3 weight percent) could be released under ambient pressure at room temperature, while the release of the residual stored hydrogen (0.9 weight percent) required some heating of the sample.

Because the SWNTs can be easily produced and show reproducible and modestly high hydrogen uptake at room temperature, they show promise as an effective hydrogen storage material.

• ↵* To whom correspondence should be addressed.

• E-mail: (H.M.C.)
• Received for publication 27 July 1999.

ppl. Phys. Lett. 76, 2877 (2000); (3 pages)

Hydrogen storage in single-walled carbon nanotubes

Seung Mi Lee and Young Hee Lee

Department of Semiconductor Science and Technology and Semiconductor Physics Research Center, Jeonbuk National University, Jeonju 561-756, Korea 

We perform density-functional calculations to search for hydrogen adsorption sites and predict maximum storage capacity in single-walled carbon nanotubes.

We find two chemisorption sites at top sites of the exterior and the interior of the tube wall. We further find that a form of H2 molecule can exist in an empty space inside nanotubes.
The storage capacity of hydrogen in an empty space increases linearly with tube diameter. The maximum storage capacity is limited by the repulsive energies between H2molecules inside nanotubes and those between H2 molecules and the tube wall.

We predict that hydrogen storage capacity in (10,10) nanotube can exceed 14 wt % (160 kg H2/m3). 

© 2000 American Institute of Physics.
© 2000 American Institute of Physics

Nature 386, 377 – 379 (27 March 1997); doi:10.1038/386377a0

Storage of hydrogen in single-walled carbon nanotubes


* National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401-3393, USA 
† IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099, USA 

Pores of molecular dimensions can adsorb large quantities of gases owing to the enhanced density of the adsorbed material inside the pores1, a consequence of the attractive potential of the pore walls.

Pederson and Broughton have suggested2 that carbon nanotubes, which have diameters of typically a few nanometres, should be able to draw up liquids by capillarity, and this effect has been seen for low-surface-tension liquids in large-diameter, multi-walled nanotubes3.

Here we show that a gas can condense to high density inside narrow, single-walled nanotubes (SWNTs).

Temperature-programmed desorption spectrosocopy shows that hydrogen will condense inside SWNTs under conditions that do not induce adsorption within a standard mesoporous activated carbon.

The very high hydrogen uptake in these materials suggests that they might be effective as a hydrogen-storage material for fuel-cell electric vehicles.

J Nanosci Nanotechnol. 2006 Mar;6(3):713-8.

Electrochemical hydrogen storage in single-walled carbon nanotube paper.

Guo ZP, Ng SH, Wang JZ, Huang ZG, Liu HK, Too CO, Wallace GG.

Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia.

Single-walled carbon nanotube (SWNT) papers were successfully prepared by dispersing SWNTs in Triton X-100 solution, then filtered by PVDF membrane (0.22 microm pore size).

The electrochemical behavior and the reversible hydrogen storage capacity of single-walled carbon nanotube (SWNT) papers have been investigated in alkaline electrolytic solutions (6 N KOH) by cyclic voltammetry, linear micropolarization, and constant current charge/discharge measurements.

The effect of thickness and the addition of carbon black on hydrogen adsorption/desorption were also investigated.

It was found that the electrochemical charge-discharge mechanism occurring in SWNT paper electrodes is somewhere between that of carbon nanotubes (physical process) and that of metal hydride electrodes (chemical process), and consists of a charge-transfer reaction (Reduction/Oxidation) and a diffusion step (Diffusion).

[PubMed – indexed for MEDLINE]
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