Nano-structured MgH2 catalyzed by TiC nanoparticles for hydrogen storage

Tian, M and Shang, C (2011) Nano-structured MgH2 catalyzed by TiC nanoparticles for hydrogen storage. Journal of Chemical Technology and Biotechnology, 86 (1). pp. 69-74. ISSN 1097-4660

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Abstract

BACKGROUND: Magnesium hydride is considered to be a promising hydrogen storage material because of its high gravimetric and volumetric storage capacities. However, its slow kinetics and high desorption temperature of > 300 °C limit practical applications. In this work, TiC nanoparticles were selected to modify the hydrogen storage properties of MgH2. Composite mixtures (MgH2 + TiC) were prepared using both cryogenic milling and high-energy ball milling. RESULTS: The resulting morphology and crystallite structure of the composites were identified by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The milled samples show good mixing of the hydride and carbide particles, with MgH2 particles around 0.09–1 µm and TiC particles 10–20 nm. The (MgH2 + TiC) composites consist of -MgH2, ß-MgH2 and TiC. MgH2 nano-crystallites of 25 nm were formed after cryomilling. Thermogravimetry reveals that the composites release ~6.5 mass % hydrogen from 190–400 °C at a heating rate of 10 °C min-1 under He flow, with the onset and peak temperatures at 190 and 280 °C, respectively, for the (MgH2 + TiC) after 8 h cryomilling and 60 h ball milling. CONCLUSION: Results indicate that TiC is an effective catalyst for hydrogen desorption of MgH2.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Rosie Cullington
Date Deposited: 21 Jan 2011 13:52
Last Modified: 21 Apr 2020 16:54
URI: https://ueaeprints.uea.ac.uk/id/eprint/19456
DOI: 10.1002/jctb.2479

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