Potential energy diagram for hydrogen near vanadium surface

Production and annihilation of deuterium traps in He-irradiated vanadium

“…1. The former and the latter corresponded to absorbed and dissolved deuterium atoms, respectively [3]. It seems that deuterium atoms on surface expanded to both positive and negative depths due to a finite resolution of the NRA detecting system.…”

“…Arrows A and B indicate the 0.8 MeV 3 He irradiation and the subsequent temperature increase, respectively. With increasing the sample temperature, the concentration of dissolved deuterium decreased due to increasing the recombination coefficient [3] and the amount of trapped deuterium decreased due to enhancement of detrapping. Consequently the areal density decreased as shown in the arrow B.…”

“…Besides, irradiation by energetic particles would produce deep potential sites for hydrogen, so-called traps, to increase the inventory. As for absorption, the evaluation is possible using thermal properties [2] and recombination coefficients [3]. As for trapping, some experimental results [4][5][6] are available but further informations such as production and annealing behavior of the trap are needed.…”

The role of V2O5 on the dehydrogenation and hydrogenation in magnesium hydride: An ab initio study

“…32,33 The reaction ͑VH 2 → V+2H͒ was reported to occur at 35 C with an activation barrier of 0.04 eV for the diffusion of atomic H from free V surface. 34 Subsequently, the atomic H transfers to Mg atoms, forming MgH 2 around the V site and, thus, V can be regarded as an "atomic hydrogen pump," which facilitates the adsorption of atomic H. While our results presented herein shed light on the nature of the initial surface adsorption of hydrogen onto V sites in the Mg surface, they do not provide a full rationalization of the experimentally observed catalytic role of V for hydrogen sorption into ball milled Mg nanocomposite materials. In order to probe for possible low-energy diffusion pathways that might provide a more complete theoretical explanation of the catalytic role, further studies on H diffusion away from the V site will be required.…”

Electrochemical hydrogen storage in (Ti1−V )2Ni (x= 0.05–0.3) alloys comprising icosahedral quasicrystalline phase

“…Although V displays a high affinity for hydride formation, V hydrides may also be decomposed very easily. It is reported that the energy barrier for H desorption from a free V surface is only 0.04 eV [17]. Subsequently, the atomic hydrogen transferred to the interstitial location near Ti atoms, forming hydride around the V site.…”