Abstract
The article describes potential application of the BCC alloy Ti0.95Zr0.05Cr0.8Mn0.8V0.2Ni0.2 in the hydrogen absorption process. It deals with the measurements of the PCI (Pressure Concentration Isotherm) characteristics applying the volumetric method. With regard to the fact that it is an indirect measurement method, the thermodynamic description was analysed in details and subsequently used to identify the weight capacity of the stored hydrogen. The article presents a detailed description of the procedure for measuring the free volume of the measuring equipment using helium which is able to penetrate into pores and apertures with the size of only a few nanometres but does not participate in the absorption into the intermetallic structure of the alloy. The hydrogen absorption into the tested alloy was initiated by repeatedly performed activation of the alloy surface. The final section of the article presents the examination of the cyclic stability of the absorption-desorption cycle within the repeated monitoring of the maximum weight capacity of the stored hydrogen.
Highlights
The complete implementation of the use of hydrogen as an energy carrier requires efficient, safe, and cheap storage thereof [1,2,3]
An option that seems to be appropriate is the use of metal hydride alloys which facilitate the storage of hydrogen in crystal lattices of metals
In the case of the tested alloy Ti0.95Zr0.05Cr0.8Mn0.8V0.2Ni0.2, hydrogen was stored in the cubic lattice
Summary
The complete implementation of the use of hydrogen as an energy carrier requires efficient, safe, and cheap storage thereof [1,2,3]. The volume of hydrogen in the free space of the apparatus, relative to normal conditions at the ith measurement, may be calculated using the following formula: VFV,n,i. The system was vacuumed, using a vacuum pump, to the absolute pressure of 5 Pa and filled with helium with which absorption into the alloy structure does not occur; this facilitated measuring the amount of the gas released into the volumetric measurement system in order to identify the free volume between the grains and use such data to make a simple calculation of the missing parameter VFV. By subsequent solving of the equation, it was possible to calculate the ratio of the free volume and the average temperature; the ratio was identical to that observed during the measurements with hydrogen and helium (while maintaining the same thermal field of the tank). The value of the increase in the mass concentration Ψ3 was 1.66∙10-5 s-1
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