کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7720809 | 1497505 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A DFT study of dopant (Zr, Nb) and vacancies on the dehydrogenation on MgH2 (001) surface
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ab initio calculations were used to study dehydrogenation energy in a set of systems, pure, Nb- or Zr-doped, free of defects and containing vacancy-like defects MgH2 (001) surface. The preferential location site for dopants was determined by means of occupation energy analysis. Zr atom prefers substitutional and interstitial sites while Nb locates on interstitial site close to the surface. The effect of vacancies in the geometric structure and in dehydrogenation energy was considered. It was found that MgH2 containing a Mg vacancy doped with Zr, in an interstitial site and the same system containing Mg-H complex vacancy, modify the surface geometry and weakens the Mg-H bonds making easier the dehydrogenation process. When the surface is doped with Nb despite any vacancy generation, the dehydrogenation is less probable energetically in comparison with Zr-doped.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 4, 22 January 2014, Pages 1732-1739
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 4, 22 January 2014, Pages 1732-1739
نویسندگان
EstefanÃa Germán, Carla Luna, Jorge Marchetti, Paula Jasen, Carlos Macchi, Alfredo Juan,