کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1626053 | 1516443 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of NaAlH4-based hydrogen storage material using milling under low pressure hydrogen atmosphere
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The present study highlights the advantages of milling NaH/Al under moderate hydrogen pressure as a favourable production step for NaAlH4-based hydrogen storage materials. Firstly, it is demonstrated that NaAlH4 can be obtained by applying a moderate hydrogen pressure (6-12 bar) during milling of NaH and Al with and without the presence of an inexpensive catalyst (TiCl4). The yield of NaAlH4 depends critically on process parameters, such as hydrogen pressure and milling time. A fully converted product is capable of reversible hydrogen storage without any activation procedure. Under optimized conditions, a capacity of 4.2 wt.% was achieved and kinetics in the first desorption are comparable to NaAlH4 doped with TiCl3. Secondly, the synthesis has been optimized towards shorter milling times. By applying a few absorption/desorption cycles to material that was partially converted during milling, almost full reversible storage capacity can be reached. In addition, kinetics is extremely enhanced. For example, such material exhibits an optimum capacity already after two sorption cycles at 100 bar and 125 °C and allows to absorb 80% of the reversible hydrogen content within a few minutes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 430, Issues 1â2, 14 March 2007, Pages 350-355
Journal: Journal of Alloys and Compounds - Volume 430, Issues 1â2, 14 March 2007, Pages 350-355
نویسندگان
Nico Eigen, Mirko Kunowsky, Thomas Klassen, Rüdiger Bormann,