کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7994267 | 1516157 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the hydrogen desorption entropy change of modified MgH2
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Reducing hydrogen desorption temperature (Td) is a current challenge for application of Mg-based hydrogen storage alloys. The equilibrium Td is directly determined by the thermodynamics, characterized by the enthalpy (ÎH) and the entropy (ÎS), of hydrogen desorption reaction of MgH2. While the change of ÎH has been proved due to the size effect and alloying effect, the ÎS is customary considered as entropy of H2, being a constant of 130.5 Jmol-1·Kâ1. Very recently, however, the ÎS is experimentally reported to change in some cases as well. In this work, for the first time, we proposed a model to illustrate theoretically that the vary of ÎS, which significantly influences the Td, of MgH2 with the changing particle/grain size, covering catalyst on surface and forming solid solution of MgH2 that facilitates the hydrogen molecule dissociation. The model is supported by the experimental results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 737, 15 March 2018, Pages 427-432
Journal: Journal of Alloys and Compounds - Volume 737, 15 March 2018, Pages 427-432
نویسندگان
Jie Cui, Liuzhang Ouyang, Hui Wang, Xiangdong Yao, Min Zhu,