TY - JOUR
T1 - Engineering Ti–Cr–Mo-based alloys for hydrogen storage
T2 - Fe doping as a strategy for improved reversibility and stability
AU - Cai, Hongmei
AU - Dou, Bang
AU - Xue, Lufeng
AU - Cheng, Bo
AU - Zhao, Yumeng
AU - Wan, Di
AU - Xue, Yunfei
N1 - Publisher Copyright:
© 2025
PY - 2025/5/15
Y1 - 2025/5/15
N2 - Ti–Cr–Mo-based multi-principal element alloys have emerged as promising candidates for hydrogen storage due to their high capacity and cost-effectiveness. However, their practical application is limited by challenges such as low reversible hydrogen release and poor cyclic stability. In this study, we developed a body-centered cubic (BCC) alloy, Ti40Cr48Mo10Fe2, which demonstrates a reversible capacity of 2.59 wt% at 303 K. The doping of Fe reduces the dehydrogenation enthalpy ΔH to 32.4 kJ/mol, which is notably more favorable than that of most other reported Ti–Cr–Mo-based alloys. Additionally, the mechanism of capacity attenuation was explored. The results reveal that hydrogen-induced phase transformation leads to the accumulation of stress and strain, which increases the energy barrier for hydrogen diffusion and release. Moreover, the formation of irreversible Ti hydrides plays a key role in capacity loss. These findings offer strategies for developing hydrogen storage alloys with long service life and reduced costs.
AB - Ti–Cr–Mo-based multi-principal element alloys have emerged as promising candidates for hydrogen storage due to their high capacity and cost-effectiveness. However, their practical application is limited by challenges such as low reversible hydrogen release and poor cyclic stability. In this study, we developed a body-centered cubic (BCC) alloy, Ti40Cr48Mo10Fe2, which demonstrates a reversible capacity of 2.59 wt% at 303 K. The doping of Fe reduces the dehydrogenation enthalpy ΔH to 32.4 kJ/mol, which is notably more favorable than that of most other reported Ti–Cr–Mo-based alloys. Additionally, the mechanism of capacity attenuation was explored. The results reveal that hydrogen-induced phase transformation leads to the accumulation of stress and strain, which increases the energy barrier for hydrogen diffusion and release. Moreover, the formation of irreversible Ti hydrides plays a key role in capacity loss. These findings offer strategies for developing hydrogen storage alloys with long service life and reduced costs.
KW - Body-centered cubic
KW - Cyclic performance
KW - Hydrogen storage alloy
KW - Multi-principal element alloy
KW - TiCrMo alloy
UR - http://www.scopus.com/inward/record.url?scp=105002690147&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2025.04.139
DO - 10.1016/j.ijhydene.2025.04.139
M3 - Article
AN - SCOPUS:105002690147
SN - 0360-3199
VL - 128
SP - 499
EP - 510
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
ER -