Synthesis of highly active Mg-Based hydrides using hydriding combustion synthesis and NbF₅ Additives

TY - JOUR

T1 - Synthesis of highly active Mg-Based hydrides using hydriding combustion synthesis and NbF5 Additives

AU - Chourashiya, M. G.

AU - Park, C. N.

AU - Park, C. J.

N1 - Funding Information: This work was supported by the Basic Research Laboratories (BRL) Program (2011-0001567) of the National Research Foundation of Korea (NRF) funded by the Korean Ministry of Education, Science and Technology (MEST) and by the Energy Efficiency & Resources Program of the Korea Institute of Energy Technology Evaluation and Planning (20112010100110) grant funded by the Korea government Ministry of Knowledge Economy.

PY - 2012/9

Y1 - 2012/9

N2 - 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.

AB - 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.

KW - Mg-based alloys

KW - NbF catalyst

KW - absorption/desorption kinetics

KW - hydriding combustion

KW - hydrogen storage

UR - http://www.scopus.com/inward/record.url?scp=84866064751&partnerID=8YFLogxK

U2 - 10.1142/S1793604712500257

DO - 10.1142/S1793604712500257

M3 - 文章

AN - SCOPUS:84866064751

SN - 1793-6047

VL - 5

JO - Functional Materials Letters

JF - Functional Materials Letters

IS - 3

M1 - 1250025

ER -