Publication

Investigation of hydrogen storage in carbon nanotube-magnesium matrix composites

Daniele Mari, Robert Schaller, Iva Tkalcec Vâju
2009
Conference Papers

Abstract

Magnesium (Mg) and magnesium nickel (Mg-23.5 wt%Ni) reinforced with multiwalled carbon nanotubes (CNTs) were processed by powder metallurgy and then charged with hydrogen by annealing at 620 K under a pressure of 0.4 MPa of hydrogen. Mechanical spectroscopy revealed that such a treatment has no effect in the composites with pure Mg matrix. On the other hand, Mg-23.5 wt%Ni alloys, unreinforced as well as reinforced with CNTs, exhibit a mechanical loss spectrum, which is deeply modified by hydrogen charging. Two relaxation peaks are observed at similar to 190 K and similar to 330 K (frequency similar to 6 kHz), the height of which increases strongly with hydrogen charging. These peaks may be interpreted by atomic relaxation due to hydrogen in the Mg2Ni phase. Both peaks decrease strongly in height by degassing under vacuum at 750 K. In bulk specimens of Mg-23.5 wt%Ni/CNTs composites a concentration of hydrogen as high as 6.1 wt% (similar to 6% of specific weight of liquid hydrogen) has been obtained by the mentioned hydrogenation process. (C) 2009 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/2cb982ba-ba26-4590-9b20-1b55793a0b04

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Daniele Mari, Robert Schaller, Iva Tkalcec Vâju
2009
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2cb982ba-ba26-4590-9b20-1b55793a0b04

About this result

Related concepts (25)

Hydrogen storage

Several methods exist for storing hydrogen. These include mechanical approaches such as using high pressures and low temperatures, or employing chemical compounds that release H2 upon demand. While large amounts of hydrogen are produced by various industries, it is mostly consumed at the site of production, notably for the synthesis of ammonia. For many years hydrogen has been stored as compressed gas or cryogenic liquid, and transported as such in cylinders, tubes, and cryogenic tanks for use in industry or as propellant in space programs.

Hydrogen infrastructure

A hydrogen infrastructure is the infrastructure of hydrogen pipeline transport, points of hydrogen production and hydrogen stations (sometimes clustered as a hydrogen highway) for distribution as well as the sale of hydrogen fuel, and thus a crucial prerequisite before a successful commercialization of automotive fuel cell technology. A hydrogen highway is a chain of hydrogen-equipped filling stations and other infrastructure along a road or highway which allow hydrogen vehicles to travel.

Liquid hydrogen

Liquid hydrogen (H2(l)) is the liquid state of the element hydrogen. Hydrogen is found naturally in the molecular H2 form. To exist as a liquid, H2 must be cooled below its critical point of 33 K. However, for it to be in a fully liquid state at atmospheric pressure, H2 needs to be cooled to . A common method of obtaining liquid hydrogen involves a compressor resembling a jet engine in both appearance and principle. Liquid hydrogen is typically used as a concentrated form of hydrogen storage.

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