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

Abstract

Here we report a Ti50V50-10 wt.% C alloy with a unique lattice and microstructure for hydrogen storage development. Different from a traditionally synthesized Ti50V50 alloy prepared by a melting method and having a body-centered cubic (BCC) structure, this Ti50V50-C alloy synthesized by a mechanical alloying method is with a face-centered cubic (FCC) structure (space group: Fm-3m No. 225). The crystalline size is 60 nm. This alloy may directly absorb hydrogen near room temperature without any activation process. Mechanisms of the good kinetics from lattice and microstructure aspects were discussed. Findings reported here may indicate a new possibility in the development of future hydrogen storage materials.

Room Temperature Metal Hydrides for Stationary and Heat Storage Applications: A Review

“…Upon ball milling Ti and V with some carbon as a process control agent, Li et al (2019) reported a Ti 50 V 50 -10 wt% C based alloy forming a unique FCC structure with a low packing density (5.1 g cm −3 ) and a crystalline size of 60 nm. The packing efficiency of this FCC structure (52%) is comparatively lower than that reported for other structures such as FCC (74%), HCP (74%), or BCC (68%) and this possibly implies higher diffusion kinetics of H atoms as compared to hydrogen diffusion in the BCC lattice (Völkl and Alefeld, 1975;Li et al, 2019). TiVMn-and TiCrMn-based nano-alloys with FCC structure were also reported to form via mechanical milling (Li et al, 2018).…”