Effect of Boron on the Activation Energy of the Decomposition of LiBH4

TitleEffect of Boron on the Activation Energy of the Decomposition of LiBH4
Publication TypeJournal Article
Year of Publication2009
AuthorsPendolino F, Mauron P, Borgschulte A, Zuttel A
JournalJournal of Physical Chemistry C
Date PublishedOct 1
ISBN Number1932-7447
Accession Numberhttp://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord&UT=000269999700058
Keywordsborohydrides, hydrogen storage

We studied the decomposition reaction kinetics of lithium borohydride (LiBH4) with and without boron as an additive under various hydrogen pressures. The decomposition of LiBH4+B was studied by means of differential scanning calorimetry and thermogravimetry. Boron addition improves the dehydrogenation process, resulting in a decomposition temperature of 150 degrees C. A novel model was applied to separate thermodynamic and kinetic effects and to evaluate the activation energy of decomposition. The model takes into account the effect of hydrogen pressure on the reaction and allows us to evaluate the thermodynamic parameters, i.e., the enthalpy and entropy of reaction. Moreover, the effect of boron on the reaction kinetics is also demonstrated by the reduction of the activation energy from E-a* = 59 +/- 2kJ/mol (pure system) to E-a* = 54.8 +/- 0.7 kJ/mol.