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Examinando por Autor "Montes-Vera, E."

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  • Publicación
    Acceso abierto
    Metal hydrides with body-centered cubic structure: Advantages and challenges
    (2019-11-05) Martinez-Amariz, Alejandro David; Peña, Dario; Montes-Vera, E.
    Metal hydrides are considered an easy and safe way to store hydrogen. Storage is one of the keys to the large-scale implementation of the so-called hydrogen economy, which will undoubtedly revolutionize the new vision of sustainable development towards a more environmentally friendly world. This paper presents a general review of some alloys based on TiCrV and TiCrVZr showing their advantages and challenges that must be developed for their implementation. The capacity of absorption and desorption as a function of time is shown using a Sieverts type device, the structure is studied by means of X-ray diffraction as well as its morphology by means of scanning electron microscopy. This paper shows the advantages and disadvantages of alloy synthesis methods based on transition metals, it is observed that hydrogen capacity increases in the process of fusion synthesis and decreases in the process by mechanical grinding, however the capacity desorption is not optimal at room temperature.
  • Publicación
    Acceso abierto
    Structural study of hydrogen absorption properties using Thermocalc software for application in energy storage
    (2019-11-05) Bellon-Monsalve, Daniela; Martinez-Amariz, Alejandro David; Montes-Vera, E.
    The interest in developing experiments and processes in general through mathematical modelling or simulation, has been growing considerably in recent decades; the previous, insofar as it offers highly reliable results that have an impact on advantages such as reduction of the risk associated with the execution of costly or difficult to reproduce experiments since they handle many variables or even the elimination of times associated with the execution of said experiments. For its part, the study of hydrogen storage alloys represents a fundamental element in the so-called hydrogen economy, which seeks the integration of hydrogen as an alternative solution to dependence on fossil fuels, due that this energy vector has a high energy density when is compared to the gasoline and the only residue of this process is water vapor that will undoubtedly reduce CO2 emissions. Thus, in this study a simulation of the evolution of the microstructure of hydrogen storage alloys based on TiCrV is developed, using ternary systems at different temperatures; this evolution is the result of the phase change when the elements are subjected from high temperatures to room temperature, obtaining a body-centered cubic structure. Likewise, the solidification process of the components present in the alloy is studied to corroborate the final structure with experimental data. In preliminary results, it is observed that the simulation throws a body centered structure, and in the solidification process, a remnant of a compact hexagonal structure is observed. This Ti-Cr-V system is widely studied due to its large hydrogen storage capacity, which can be used for technological purposes.
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