Impacts of Y dopants on the microstructure and cyclic stability of TiCrVFeMo alloys

Zhang, Xiaoxuan; Xiao, Houqun; He, Xincong; Tang, Ruizhu; Zhou, Wenhao; Ma, Chuanming; Hu, Huazhou; Chen, Qingjun

doi:10.1016/j.ijhydene.2024.02.330

Cited by 1 publication

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metal hydrides usually form interstitial hydrides in which atomic hydrogen occupies interstitial voids in the crystal, which typically includes LaNi 5 , AB, AB 2 or V-based bodycentered cubic (BCC) alloys [15][16][17][18]. Though the V-based BCC alloys have maximum theoretical hydrogen-storage capacity~3.8 wt% among them, they face the problem of difficult activation and keeping residual hydrogen in the alloys [19]. Furthermore, it has been verified that the content of vanadium plays a crucial role in the cyclic stability of the typical Ti-Cr-V BCC-type hydrogen-storage alloy [20].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hydrogen-Storage Properties of MgH2 Catalyzed via a Cerium Doped TiCrV BCC Alloy

Xiao,

Zhang,

et al. 2024

Metals

Self Cite

View full text Add to dashboard Cite

In this work, Ce-doped Ti6Cr14V80 BCC hydrogen-storage alloys have been synthesized as catalysts to enhance the hydrogen-storage performance of MgH2 based on its room-temperature activation features and excellent durability. The Ti6Cr14V80Ce1 alloy was pre-ball milled under a hydrogen atmosphere into a Ti6Cr14V80Ce1Hx hydride. Different amounts of the Ti6Cr14V80Ce1Hx hydride were incorporated into MgH2 by ball milling to obtain the MgH2 + y wt%Ti6Cr14V80Ce1Hx (y = 0, 3, 5, 10, 15) nano-composites. With an optimization doping of 10 wt%Ti6Cr14V80Ce1Hx, the initial dehydrogenated temperature was decreased to 160 °C. Moreover, the composite can rapidly release 6.73 wt% H2 within 8 min at 230 °C. Also, it can absorb 2.0 wt% H2 within 1 h even at room temperature and uptake 4.86 wt% H2 within 10 s at 125 °C. In addition, the apparent dehydrogenated activation energy of the MgH2 + 10 wt%Ti6Cr14V80Ce1Hx composite was calculated to be 62.62 kJ mol−1 fitted by the JMAK model. The capacity retention was kept as 84% after 100 cycles at 300 °C. The ball milled Ti6Cr14V80Ce1Hx transformed from the initial FCC phase structure into a BCC phase after complete dehydrogenation and back into an FCC phase when fullly hydrogenated. A catalyst mechanism analysis revealed that the ‘autocatalytic effect’ originating in Ti6Cr14V80Ce1Hx plays a crucial role in boosting the de-/hydrogenation properties of MgH2. This work provides meaningful insights into rational designs of nano-compositing with different hydrogen-storage alloy catalyzed MgH2.

show abstract