Hydrogen generation performance of Al–20at%Ca alloy synthesized by mechanical alloying

AIMS Materials Science

A. G. Hernández-Torres¹  J. L. López-Miranda²  I. Santos-Ramos³  G. Rosas³ 

[1] 1 Facultad de Química, UNAM circuito exterior, Ciudad Universitaria, 04510, México, D. F.;2 Centro de Física Aplicada y Tecnología Avanzada, UNAM, Boulevar Juriquilla 3001, Santiago de Querétaro, QRO,76230, México;3 Instituto de Investigaciones en Metalurgia y Materiales, UMSNH, edificio U, ciudad universitaria, C. P. 58060, Morelia, Michoacán, México;

关键词: hydrogen generation;    intermetallic;    nanostructured materials;    mechanical alloying;    microstructure;    x-ray diffraction;    scanning electron microscopy;   

DOI  :  10.3934/matersci.2020.2.144

来源: DOAJ

【 摘 要 】

In this study, the Al–20at%Ca alloy was synthesized by mechanical alloy from the elemental powder mixture. Subsequently, the alloy particles were reacted at room temperature to determine the amount of hydrogen released. For these purposes, the powders reacted with different types of water, such as distilled water, tap water, and seawater, and also in the presence of NaCl and CaO additives. Both milled samples and reaction powders were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), FT-IR, and Raman spectroscopy (RS). The XRD patterns of the powders prepared show a nanocrystalline alloy consisting of a solid-cubic solution of Al and the tetragonal intermetallic phase CaAl₄. Studies of XRD and SEM, as well as direct measurements of H₂, indicated that the best results of H₂ generation were obtained when the alloy reacts with distilled water. Both NaCl and CaO additives improve hydrogen generation, reaching 100% efficiency in distilled water and seawater, and without induction time. Samples with a combination of NaCl and distilled water showed the best reaction times to generate the entire theoretical amount of hydrogen. The XRD and DSC–TGA standards also confirmed the presence of bayerite Al(OH)₃ as a secondary reaction product.

【 授权许可】

Unknown