کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1614940 1516342 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen storage properties of LiBH4 destabilized by SrH2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Hydrogen storage properties of LiBH4 destabilized by SrH2
چکیده انگلیسی

In this work, we have succeeded in destabilizing LiBH4 by the addition of SrH2, via the reaction 6LiBH4 + SrH2 → SrB6 + 6LiH + 10H2 with a theoretical hydrogen capacity of 9.1 wt.%. According to the van’t Hoff and Arrhenius equations, the dehydrogenation enthalpy change and activation energy for the LiBH4/SrH2 system were experimentally determined to be 48 kJ/mol H2 and 64 kJ/mol, respectively. Both are remarkably reduced in comparison with the pristine LiBH4, which is responsible for the improved dehydrogenation property of the LiBH4/SrH2 system. The dehydrogenated products SrB6 + 6LiH can be rehydrogenated to form LiBH4 and LiSrH3 at 723 K under an initial hydrogen pressure of 8.0 MPa.


► Thermal stability of LiBH4 can be remarkably reduced by the addition of SrH2.
► Dehydrogenation enthalpy change for the LiBH4/SrH2 system is 48 kJ/mol H2.
► Dehydrogenation process of the LiBH4/SrH2 system is rate-limited by a three-dimension phase boundary mechanism.
► LiBH4 can be regenerated upon rehydrogenation at 723 K under an initial hydrogen pressure of 8.0 MPa.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 551, 25 February 2013, Pages 8–11
نویسندگان
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