TY - JOUR

T1 - 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

AU - Shelyapina, Marina

AU - Dost, Anna

AU - Skryabina, N. E.

AU - Privalov, A. F.

AU - Vogel, M.

AU - Fruchart, Daniel

PY - 2020

Y1 - 2020

N2 - In order to optimize hydrogen storage properties of bcc Ti–V–Cr alloys it was found that alloying with a few 4 at% of Zr 7Ni 10 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 (TiCr 1.8) 1-xV x 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 Zr 7Ni 10 lowers the activation energy of hydrogen motion in (TiCr 1.8) 1-xV x 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.

AB - In order to optimize hydrogen storage properties of bcc Ti–V–Cr alloys it was found that alloying with a few 4 at% of Zr 7Ni 10 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 (TiCr 1.8) 1-xV x 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 Zr 7Ni 10 lowers the activation energy of hydrogen motion in (TiCr 1.8) 1-xV x 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.

KW - Hydrogen diffusion

KW - Microstructure

KW - NMR

KW - Ti–V–Cr alloys

UR - http://www.scopus.com/inward/record.url?scp=85068860795&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/effect-zr7ni10-additive-hydrogen-mobility-ticr181xvx-x-02-04-06-08-1h-nmr-sfg-study

U2 - 10.1016/j.ijhydene.2019.06.136

DO - 10.1016/j.ijhydene.2019.06.136

M3 - Article

VL - 45

SP - 7929

EP - 7937

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 14

ER -