V. N. Kudiarov, K. I. Busuek, D. V. Smovzh, S. Z. Sakhapov
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引用次数: 0
Abstract
This study investigates the effect of magnesium oxide, which is synthesized for the first time through electric arc sputtering, on the desorption temperature and activation energy of hydrogen from a composite based on magnesium hydride. Scanning electron microscopy determines the average particle size of the composite to be 297 nm, which is 33 times smaller than the particle size of magnesium hydride powder obtained under the same mechanical-synthesis parameters in a planetary ball mill. X-ray phase analysis does not reveal any additional phases in the synthesized sample, which confirms there is no catalytic adsorption or desorption reactions of hydrogen during the mechanical synthesis of magnesium hydride with the addition of magnesium oxide. The method of thermally stimulated desorption reveals a decrease in the peak desorption temperature of hydrogen from a composite based on magnesium oxide and magnesium hydride, compared to pure milled MgH2, by 107, 124, and 127°C at heating rates of 8, 6, and 4°C/min, respectively. The activation energy for hydrogen desorption from the composite was 72 ± 1 kJ/mol, which is 82 kJ/mol lower than the activation energy for hydrogen desorption from magnesium hydride. This result confirms the positive effect of the noncatalytic additive on the kinetics of hydrogen desorption from magnesium hydride.
期刊介绍:
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.