Enhanced hydrogen sorption of LiBH4–LiAlH4 by quenching dehydrogenation, ball milling, and doping with MWCNTs. Meethom, S.; Kaewsuwan, D.; Chanlek, N.; Utke, O.; and Utke, R. Journal of Physics and Chemistry of Solids, 2020. cited By 0
Enhanced hydrogen sorption of LiBH4–LiAlH4 by quenching dehydrogenation, ball milling, and doping with MWCNTs [link]Paper  doi  abstract   bibtex   
Poor reversibility of LiBH4 and LiAlH4 (or Li3AlH6) is found in LiBH4–LiAlH4 composite due to the agglomeration of Al upon dehydrogenation, resulting in the ineffective formation of AlB2 and LiAl. A new strategy of quenching the first-step dehydrogenation of LiBH4–LiAlH4 composite (T = 220 °C) and particle size reduction via ball milling, leading to good dispersion of all species especially Al, is proposed for the first time. Additionally, multi-walled carbon nanotubes (MWCNTs) are doped into the milled sample to enhance hydrogen diffusion and thermal conductivity, favoring hydrogen sorption of hydrides. The LiBH4–LiAlH4 composite shows the individual decomposition of LiAlH4 and LiBH4 to LiH, Al, amorphous B, and Li2B12H12; and decomposition of the milled sample quenched during dehydrogenation proceeds through reactions of Al with LiBH4 and LiH to form AlB2 and LiAl, respectively. This leads to three times faster kinetics, reduction of onset temperature by 120 °C, and reversibility of LiBH4, LiAlH4, and Li3AlH6. For the MWCNTs-doped sample, although LiAlH4 and Li3AlH6 cannot be reproduced, kinetics is enhanced due to positive effects of MWCNTs. © 2019 Elsevier Ltd
@ARTICLE{Meethom2020,
author={Meethom, S. and Kaewsuwan, D. and Chanlek, N. and Utke, O. and Utke, R.},
title={Enhanced hydrogen sorption of LiBH4–LiAlH4 by quenching dehydrogenation, ball milling, and doping with MWCNTs},
journal={Journal of Physics and Chemistry of Solids},
year={2020},
volume={136},
doi={10.1016/j.jpcs.2019.109202},
art_number={109202},
note={cited By 0},
url={https://www.scopus.com/inward/record.uri?eid=2-s2.0-85072244379&doi=10.1016%2fj.jpcs.2019.109202&partnerID=40&md5=58d9ac34b7ce7ab2951b104833b4e21e},
affiliation={School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand; Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization, School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand; Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand; Mechanical System Division, Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand},
abstract={Poor reversibility of LiBH4 and LiAlH4 (or Li3AlH6) is found in LiBH4–LiAlH4 composite due to the agglomeration of Al upon dehydrogenation, resulting in the ineffective formation of AlB2 and LiAl. A new strategy of quenching the first-step dehydrogenation of LiBH4–LiAlH4 composite (T = 220 °C) and particle size reduction via ball milling, leading to good dispersion of all species especially Al, is proposed for the first time. Additionally, multi-walled carbon nanotubes (MWCNTs) are doped into the milled sample to enhance hydrogen diffusion and thermal conductivity, favoring hydrogen sorption of hydrides. The LiBH4–LiAlH4 composite shows the individual decomposition of LiAlH4 and LiBH4 to LiH, Al, amorphous B, and Li2B12H12; and decomposition of the milled sample quenched during dehydrogenation proceeds through reactions of Al with LiBH4 and LiH to form AlB2 and LiAl, respectively. This leads to three times faster kinetics, reduction of onset temperature by 120 °C, and reversibility of LiBH4, LiAlH4, and Li3AlH6. For the MWCNTs-doped sample, although LiAlH4 and Li3AlH6 cannot be reproduced, kinetics is enhanced due to positive effects of MWCNTs. © 2019 Elsevier Ltd},
author_keywords={27Al MAS NMR;  Aluminum diboride;  Hydride composites;  Lithium aluminum alloy;  Reversibility},
document_type={Article},
source={Scopus},
}
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