4.7 Article

Novel Sieverts' type volumetric measurements of hydrogen storage properties for very small sample quantities

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 452, Issue 2, Pages 410-413

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2006.11.014

Keywords

hydrogen storage materials; gas-solid reactions

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Novel volumetric analysis instrument for studying hydrogen storage property of very small quantities (similar to mg) of samples was developed and tested. Small pressure change arising from hydrogen uptake or release are precisely measured and equated to the change in the sample's hydrogen content using the gas law equation. Very small volume pressure reservoir enables these precise measurements, and all internal volumes are calibrated with high-purity helium gas. Capacity, equilibrium isotherm, and kinetic measurements can be performed in the pressure range of vacuum to 4 MPa and the temperature range from cryogenic-673K. Test measurements were made on small carbon nanotube samples and measurement of less than similar to 3 mu g of hydrogen uptake was demonstrated, which corresponds to an accuracy of better than 0.15 wt% for a 2 mg sample. (c) 2006 Elsevier B.V. All rights reserved.

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