Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 31, Pages 6490-6494Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm00609b
Keywords
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Funding
- Ministry of Education, Singapore [MOE2009-T2-2-024]
- National Research Foundation, Singapore [2009 NRF-CRP 001-032]
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The doping of dispersed lithium (Li) onto multi-wall carbon nanotubes (CNTs) was performed by a solution method for hydrogen storage. The sample with a Li content of 1.2 wt% shows a maximal reversible hydrogen storage capacity of 3.9 wt% at 77 K and 106.66 kPa, which exceeds that of the un-doped CNTs by three times. According to the analyses of X-ray photoelectron spectroscopy, adsorption heat and nitrogen adsorption isotherms, the strong interaction between hydrogen molecules and the Li-doped CNTs, as well as the better charge isolation state of Li, may contribute to the improved hydrogen storage capacity. However, excessive Li may result in a lowering of the charge isolation state and a decrease in specific surface area and pore volume, and thus deteriorate the hydrogen storage capacity.
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