Ti-V-Mn based metal hydrides for hydrogen storage and compression applications

Pickering, Lydia (2014). Ti-V-Mn based metal hydrides for hydrogen storage and compression applications. University of Birmingham. Ph.D.

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Abstract

The overall aim of this work was to investigate the synthesis of Laves phase-related BCC solid solution Ti V Mn based alloys for use in hydrogen storage and hydrogen compression applications. In particular, for Ti0.5V0.5Mn-based alloys, the effect of composition, microstructure, and crystallography on the hydrogen sorption properties, were investigated.
After investigating seven novel compositions based on Ti-V-Mn, (i.e. Ti\(_{0.5}\)V\(_{0.4}\)TM\(_{0.1}\)Mn, where TM = Nb, Cr, Mo, Ta and Ti\(_{0.5}\)V\(_{0.5-x}\)Nb\(_x\)Mn, where x = 0.05, 0.2 and 0.5) it was found that small amounts (0.05 - 0.1 at%) of Nb substituted for V resulted in smaller hysteresis between absorption and desorption as well as higher hydrogen dissociation pressures. This finding led to the successful development of a two-stage metal hydride compressor utilising one of the novel composition (Nb = 0.05), which is capable of pressurising a cylinder up to 650 bar from an input pressure of less than 10 bar at 0.5 g H\(_2\)/min
In summary, these findings confirm that it is possible to tailor the plateau pressure and enthalpy of a metal hydride system formed by alloying Ti-V-Mn with other transition metals.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

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