Abstract
Mg-based materials are regarded as one of the most promising candidates for hydrogen storage. In order to clarify the relationship between the structures and properties as well as to understand the reaction and formation mechanisms, it is beneficial to obtain useful information about the size, morphology, and microstructure of the studied materials. Herein, the use of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques for the representation of Mg-based hydrogen storage materials is described. The basic principles of SEM and TEM are presented and the characterizations of the size, morphology observation, phase and composition determination, and formation and reaction mechanisms clarification of Mg-based hydrogen storage materials are discussed. The applications of advanced SEM and TEM play significant roles in the research and development of the next-generation hydrogen storage materials.
Highlights
Mg-based materials are thought to be very promising solid state hydrogen storage systems for mobile or stationary applications due to its low price, abundant resources, and high theoretical hydrogenation capacity [1,2,3,4,5,6,7,8,9,10]
An activation process of absorption/desorption requires a high temperature of about 623 K and a hydrogen pressure of 70 atm without any additives [11]
The main materials discussed in this work include the following: (a) Mg and other alloy metal nanoparticles (Ni, Cu, Co, Fe, and Al) synthesized by a hydrogen plasma metal reaction method
Summary
Mg-based materials are thought to be very promising solid state hydrogen storage systems for mobile or stationary applications due to its low price, abundant resources, and high theoretical hydrogenation capacity [1,2,3,4,5,6,7,8,9,10]. Numerous efforts are required to improve the kinetics and to tailor the thermodynamics in Mg-based materials To overcome these drawbacks, different nanoprocessing techniques are adopted to synthesize Mg-based nanomaterials for hydrogen storage development. Different nanoprocessing techniques are adopted to synthesize Mg-based nanomaterials for hydrogen storage development These techniques include ball milling, hydrogen plasma metal reaction (HPMR), catalyzed solution chemical synthesis, and nanoconfinement [8, 12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]. (g) MgH2 and Mg2NiH4 samples from the hydrogenation of Mg and Mg2Ni (in situ observation of hydrogen reaction mechanism)
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