Pressure and temperature dependence of the decomposition pathway of LiBH_4
Abstract
The decomposition pathway is crucial for the applicability of LiBH_4 as a hydrogen storage material. We discuss and compare the different decomposition pathways of LiBH_4 according to the thermodynamic parameters and show the experimental ways to realize them. Two pathways, i.e. the direct decomposition into boron and the decomposition via Li_2B_(12)H_(12), were realized under appropriate conditions, respectively. By applying a H_2 pressure of 50 bar at 873 K or 10 bar at 700 K, LiBH_4 is forced to decompose into Li_2B_(12)H_(12). In a lower pressure range of 0.1 to 10 bar at 873 K and 800 K, the concurrence of both decomposition pathways is observed. Raman spectroscopy and ^(11)B MAS NMR measurements confirm the formation of an intermediate Li_2B_(12)H_(12) phase (mostly Li_2B_(12)H_(12) adducts, such as dimers or trimers) and amorphous boron.
Additional Information
© 2012 Owner Societies. Received 13 Jan 2012, Accepted 07 Mar 2012. First published on the web 08 Mar 2012. Financial support from the Swiss National Science Foundation (SNF 200021_129603/1), from the Korea Research Council of Fundamental Science and Technology and by a grant from Switzerland through the Swiss Contribution to the enlarged European Union is gratefully appreciated. S.-J. H. kindly acknowledges the partial support from the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, through the Hydrogen, Fuel Cells & Infrastructure Technologies Program under contract number DE-AI-01- 05EE11105 (JPL-Caltech). The NMR facility at Caltech was supported by the National Science Foundation (NSF) under Grant Number 9724240 and partially supported by the MRSEC Program of the NSF under Award Number DMR- 520565. S. O. kindly acknowledges the support by "funding Program for Next Generation World-Leading Researchers (No. GR008)" and "ICC-IMR".Attached Files
Published - Yan2012p18166Physical_Chemistry_Chemical_Physics.pdf
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Additional details
- Eprint ID
- 31643
- Resolver ID
- CaltechAUTHORS:20120525-071657678
- SNF 200021_129603/1
- Swiss National Science Foundation (SNSF)
- Korea Research Council of Fundamental Science and Technology
- DE-AI-01-05EE11105
- Department of Energy (DOE)
- DMR-9724240
- NSF
- DMR-0520565
- NSF
- GR008
- Program for Next Generation World-Leading Researchers
- ICC-IMR
- Swiss Contribution
- Created
-
2012-05-25Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field