STUDY ON HYDROGEN STORAGE PROPERTIES OF Mg-BASED COMPOSITE MATERIALS WITH（Ti0.32Cr0.30V0.38）1-xFex ALLOY

Deng Jing; Yuan Huiping; Yu Qinghe; Wu Yuanfang; Wang Shaohua; Wang Shumao

doi:10.19912/j.0254-0096.tynxb.2025-0718

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (9) : 131-137. DOI: 10.19912/j.0254-0096.tynxb.2025-0718

STUDY ON HYDROGEN STORAGE PROPERTIES OF Mg-BASED COMPOSITE MATERIALS WITH（Ti_0.32Cr_0.30V_0.38）_1-_xFe_x ALLOY

Deng Jing^1-3, Yuan Huiping^1-3, Yu Qinghe^1-3, Wu Yuanfang^1-3, Wang Shaohua^1-3, Wang Shumao^1-3

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Abstract

The （Ti_0.32Cr_0.30V_0.38）_1-_xFe_x（x=0、0.07、0.17） alloys with a BCC structure and high hydrogen storage capacity were designed and prepared. These alloys with varying Fe contents were composited with Mg via reactive ball milling under a hydrogen atmosphere to study their effects on the kinetic and thermodynamic properties of the Mg-based hydrogen storage materials. The hydrogen storage properties of the alloys and composites were evaluated by Sieverts’volumetric method, while their microstructures were characterized by XRD, SEM, and TEM. The results demonstrate that the composite with x=0.07 exhibits optimal hydrogen storage performance, showing a reduced onset dehydrogenation temperature of 219 ℃ and a hydrogen desorption capacity of 4.22 wt% within 80 minutes at 260 ℃. Further, the dehydrogenation enthalpy is decreased by 13 kJ/mol compared to MgH₂ prepared via the same synthesis method. The dehydrogenation activation energy of the composite exhibits a gradual reduction with increasing Fe content in the alloy. The Mg/（Ti_0.32Cr_0.30V_0.38）_0.83Fe_0.17 composite exhibits the lowest dehydrogenation activation energy of 80.48 kJ/mol. The researche reveals that the in-situ formed Mg₂FeH₆ provides active sites for the dehydrogenation reaction, while the electron transfer between the alloy elements and Mg reduces the electron cloud density of Mg, thereby facilitating the dissociation of H atoms. The mechanism analysis reveals that （Ti_0.32Cr_0.30V_0.38）_0.93Fe_0.07 exhibits high hardness and resists pulverization during reactive ball milling. These characteristics are more conducive to grain refinement and the formation of γ-MgH₂ in the Mg/（Ti_0.32Cr_0.30V_0.38）_0.93Fe_0.07composite, ultimately enhancing its thermodynamic performance.

Key words

Mg / hydrogen storage performance / body-centered cubic alloys / γ-MgH₂ / reactive ball milling

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Deng Jing, Yuan Huiping, Yu Qinghe, Wu Yuanfang, Wang Shaohua, Wang Shumao. STUDY ON HYDROGEN STORAGE PROPERTIES OF Mg-BASED COMPOSITE MATERIALS WITH（Ti_0.32Cr_0.30V_0.38）_1-_xFe_x ALLOY[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 131-137 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0718

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