High temperature hydrogenation of Ti–V alloys: The effect of cycling and carbon monoxide on the bulk and surface properties

The exceptional oxidation of Ti6Al4V alloy with a pre-deposited silver layer

“…Vanadium was noticed to be able to promote oxygen adsorption at the interface of titanium particles [33] and vanadium doping can promote the formation of spherical nano-TiO2 particles with sizes ranging from 70-120 nm [34]. The doped V ions occupied the Ti 4+ site and homogeneously distributed in the vanadium doped titanium dioxide and resulted in an anatase TiO2 structure [35].…”

Metal (boro-) hydrides for high energy density storage and relevant emerging technologies

“…A rather worse case was observed in a bcc Ti-V-Cr-Mn alloy where the hydrogen reversible capacity was observed to decrease from 3.4 wt.% H in the 1 st cycle to only 2 wt.% after 200 cycles. Bulk analysis using XRD and surface studies using XPS revealed that the lattice volume of the bcc crystal was reduced and that the surface was enriched with oxygen as a consequence of the cycling [116,117]. This was suggested to cause the observed capacity decrease.…”

Ti-V-C-Based Alloy with a FCC Lattice Structure for Hydrogen Storage

“…Various types of hydrogen storage materials have been studied for these kinds of applications, e.g., chemical storage in the metals and alloys (V, La-Ni, Ti-Fe, Mg/Mg-M, M = metal), M-Al-H, M-N-H and M-B-H systems, or physical adsorption of hydrogen on carbon based materials or metal-organic frameworks (MOFs) [4,5,6]. Ti-V-based alloys with a body-centered cubic (BCC) structure have been intensively investigated as hydrogen storage materials [7,8,9,10,11,12,13,14] because of their characteristics of high hydrogen capacity (4 wt.%, or about 150 kg H/m 3 ) and a possibility of working temperatures below 200 °C. The challenges of the Ti-V-based alloys for hydrogen storage lie in their low reversible storage capacity (less than 3 wt.%) and very difficult activation process, when normally a temperature of above 400 °C and a hydrogen pressure above 4 MPa are needed for activation before the Ti-V alloys may absorb hydrogen.…”