SYNTHESIS OF HIGHLY ACTIVE Mg-BASED HYDRIDES USING HYDRIDING COMBUSTION SYNTHESIS AND NbF5 ADDITIVES

Autor:	M.G. Chourashiya, Chan-Jin Park, C. N. Park
Rok vydání:	2012
Předmět:	Crystallinity Hydrogen storage Materials science Chemical engineering Desorption Inorganic chemistry General Materials Science Absorption (chemistry) Combustion Catalysis
Zdroj:	Functional Materials Letters. :1250025
ISSN:	1793-7213 1793-6047
DOI:	10.1142/s1793604712500257
Popis:	Superiority of the hydriding combustion (HC) technique over conventional metallurgical approach to the synthesis of cost-effective Mg based hydrides, which show promise as hydrogen storage materials, is well known. In the present research, we report further improvements in HC prepared Mg -based materials, achieved by optimizing the preparative parameters of HC and by catalytic addition. Mg90-Ni60-C40 composites prepared using optimized processing parameters were ball-milled with NbF5 (10 h) and characterized for their micro-structural and hydriding properties. The ball-milled/catalyzed powder showed decreased crystallinity with CNTs on its surfaces. Surface area of the ball-milled powder decreased to almost half of the as-HC powder, while TG analysis revealed a four-fold decrease in the desorption temperature of the milled powder compared to that of the as-HC prepared powder. Activated samples achieved the maximum absorption/desorption limits (5.3 wt.%) at as low as 100°C, underlining the possibility of the use of these materials in portable hydrogen storage devices.
Databáze:	OpenAIRE
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