Catalytic De/Hydrogenation in Mg by Co-Doped Ni and VOx on Active Carbon: Extremely Fast Kinetics at Low Temperatures and High Hydrogen Capacity

Authors

  • Yi Jia,

    1. ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, QLD 4072 Brisbane, Australia
    2. School of Mechanical and Mining Engineering, University of Queensland, QLD 4072 Brisbane, Australia
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  • Lina Cheng,

    1. ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, QLD 4072 Brisbane, Australia
    2. School of Mechanical and Mining Engineering, University of Queensland, QLD 4072 Brisbane, Australia
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  • Nan Pan,

    1. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
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  • Jin Zou,

    1. School of Mechanical and Mining Engineering, University of Queensland, QLD 4072 Brisbane, Australia
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  • Gaoqing (Max) Lu,

    Corresponding author
    1. ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, QLD 4072 Brisbane, Australia
    • ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, QLD 4072 Brisbane, Australia.
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  • Xiangdong Yao

    Corresponding author
    1. ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, QLD 4072 Brisbane, Australia
    2. Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, QLD 4111 Brisbane, Australia
    • ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, QLD 4072 Brisbane, Australia.
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Abstract

A multi-component catalyst Ni-VOx/AC (VOx is comprised of V2O5 and VO2, x = 2.18) was synthesized by a wet impregnation method. The synthesized Ni-VOx/AC shows a superior catalytic effect on de/hydrogenation of Mg. The MgH2+Ni-VOx/AC composites can absorb 6.2 wt.-% hydrogen within only 1 min at 150 °C under a hydrogen pressure of 2 MPa and desorb 6.5 wt.-% hydrogen within 10 min at 300 °C under an initial hydrogen pressure of 1 KPa, which overcomes a critical barrier for practical use of Mg as a hydrogen storage material. A significant decrease of activation energy (Ea) indicates that Ni-VOx/AC catalyst is highly efficient for Mg de/hydrogenation, which may be ascribed to the synergistic effect of bimetals (metal oxides) and nanocarbon.

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