Effect of Zr7Ni10 additive on hydrogen mobility in (TiCr1.8)1-xVx (x = 0.2, 0.4, 0.6, 0.8): An 1H NMR SFG study

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Abstract

In order to optimize hydrogen storage properties of bcc Ti–V–Cr alloys it was found that alloying with a few 4 at% of Zr7Ni10 results in acceleration the hydrogen sorption kinetics in the composite material. The novel intergranular phase plays a role of gate for hydrogen, leading parallel to its easy decrepitate, thus enhancing fast formation of Ti–V–Cr hydrides. Nevertheless, the question on how such a composite microstructure affects hydrogen mobility in the material is still open. Here we report on the results of the studies of hydrogen self-diffusion in hydrogenated (TiCr1.8)1-xVx based alloys (x = 0.2, 0.4, 0.6 and 0.8) carried out using proton nuclear magnetic resonance diffusiometry in a static field gradient. For all compounds the method has proved itself as a powerful tool to probe the microstructure of the multicomponent alloys with inhomogeneous element distribution in a few micrometer scale. It has been found that addition of Zr7Ni10 lowers the activation energy of hydrogen motion in (TiCr1.8)1-xVx alloys and leads appear two different diffusion areas. They can be associated with a redistribution of elements within the intra-granular phase due to opposite substitution of Ti and Ni atoms during synthesis and blurring the boundaries between the intra-granular and inter-granular phases.

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Shelyapina, M. G., Dost, A. V., Skryabina, N. E., Privalov, A. F., Vogel, M., & Fruchart, D. (2020). Effect of Zr7Ni10 additive on hydrogen mobility in (TiCr1.8)1-xVx (x = 0.2, 0.4, 0.6, 0.8): An 1H NMR SFG study. International Journal of Hydrogen Energy, 45(14), 7929–7937. https://doi.org/10.1016/j.ijhydene.2019.06.136

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