One-step metal acetylacetonates catalyst for improved hydrogen storage of MgH2.
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| Title: | One-step metal acetylacetonates catalyst for improved hydrogen storage of MgH2. |
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| Authors: | Chen, Wenqing1 (AUTHOR), Liu, Jia1 (AUTHOR), Liu, Tianshuo1 (AUTHOR), Chen, Xiaowei1 (AUTHOR) chenxiaowei@jmu.edu.cn |
| Source: | Chemical Engineering Journal. Sep2025, Vol. 520, pN.PAG-N.PAG. 1p. |
| Subjects: | Hydrogen storage, Catalysts, Dehydrogenation, Magnesium hydride, Adsorption kinetics, Metal complexes, Density functional theory |
| Abstract: | Solid-state hydrogen storage via MgH 2 offers high volumetric density, safety, and energy efficiency but is hampered by high H 2 desorption temperatures and sluggish kinetics. Although nanostructured catalysts enhance performance, their complex synthesis and instability limit viability. We present a one-step strategy that leverages metal acetylacetonates (M(acac) n) to address these challenges. Combined V(acac) 3 with MgH 2 enables the in situ formation of a highly dispersed V-O-Mg interfacial layer, markedly enhancing H 2 sorption kinetics, achieving an onset dehydrogenation temperature of 170 °C, low temperature H 2 desorption (5.3 wt% at 184 °C) and absorption (4.3 wt% at 24 °C), and excellent cycling stability (95.6 % retention after 100 cycles). Kinetic analysis reveals that dehydrogenation initiates via two-dimensional nucleation-growth and transitions to a temperature-dependent mechanism at high conversion (α > 0.3). Density functional theory indicates that V-induced surface reconstruction and charge redistribution lower the H 2 desorption barrier. Additionally, Zr(acac)₄ and TiO(acac)₂ show similar performance improvements, suggesting a promising pathway for optimizing MgH 2 using metal acetylacetonate-based catalysts. [Display omitted] • One-step V(acac)₃ route creates nanoscale V-O-Mg catalytic interface. • Onset dehydrogenation cut to 170 °C; 5.3 wt% H₂ released at 184 °C. • Rapid uptake: 4.3 wt% at 24 °C and 5.7 wt% in 5 min at 111 °C. • V-induced surface reconstruction and charge redistribution lower desorption barrier. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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