Work

Enhancing the oxidation resistance in Ti–V–Mn hydrogen storage alloy by adding Zr8Ni21

Year: 2025

Type: article

Abstract: BCC-type hydrogen storage alloys suffer from rapid oxidation degradation. This study demonstrates that incorporating 10 wt% Zr 8 Ni 21 intermetallic compound into Ti 37 V 40 Mn 23 significantly enhances its oxidation resistance and preserves hydrogen storage capacity. The results revealed that the hydrogen absorption capacity (at 303 K) of Ti 37 V 40 Mn 23 alloy decreased drastically from 3.10 wt% to 0.64 wt% after just one day of exposure to air, indicating severe oxidation. The newly developed alloy maintained the hydrogen absorption capacity (at 303 K) of 2.81 wt% even after 90 days of air exposure; and its hydrogen desorption capacity (at 303 K) remained at 99.2 % of the original value. Long-term oxidation slightly reduced desorption plateau pressure and decreased desorption enthalpy to 31.2 kJ/mol H 2 , indicating reduced hydride stability. The superior performance stems from: (i) Zr 8 Ni 21 addition reducing surface metal oxides while increasing oxygen vacancies, facilitating H-diffusion from the surface to the bulk; (ii) Zr's strong oxygen affinity enabling sacrificial early-stage oxidation, protecting the BCC phase; and (iii) absence of oxygen-enriched phases, maintaining an unoxidized alloy core.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2025.151738

Authors: Kaixiang Wang, Xiaoyu Chen, Qihao Xiang, Bin Liu, Qiang Tao

Institution: Qingdao University

Language: English

Topic: Hydrogen Storage and Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,730