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

机译:活性炭上共掺杂Ni和VOx在镁中催化脱氢/加氢:低温和高氢容量的极快动力学

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摘要

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.
机译:通过湿式浸渍法合成了多组分催化剂Ni-VOx / AC(VOx由V2O5和VO2组成,x = 2.18)。合成的Ni-VOx / AC对Mg的脱氢/脱氢具有优异的催化作用。 MgH2 + Ni-VOx / AC复合材料在2 MPa的氢气压力下于150°C只能在1分钟内吸收6.2 wt .-%的氢,而在初始温度下在300°C的10 min内能在10分钟内吸收6.5 wt .-%的氢1 KPa的氢气压力,克服了将Mg实际用作储氢材料的关键障碍。活化能(Ea)的显着降低表明Ni-VOx / AC催化剂对Mg脱氢/氢化非常有效,这可能归因于双金属(金属氧化物)和纳米碳的协同作用。

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  • 来源
    《Advanced energy materials》 |2011年第3期|1-7|共7页
  • 作者单位

    ARC Centre of Excellence for Functional Nanomaterials University of Queensland QLD 4072 Brisbane Australia;

    School of Mechanical and Mining Engineering University of Queensland QLD 4072 Brisbane Australia;

    ARC Centre of Excellence for Functional Nanomaterials University of Queensland QLD 4072 Brisbane Australia;

    School of Mechanical and Mining Engineering University of Queensland QLD 4072 Brisbane Australia;

    Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Hefei 230026 P. R. China;

    School of Mechanical and Mining Engineering University of Queensland QLD 4072 Brisbane Australia;

    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;

    Queensland Micro- and Nanotechnology Centre (QMNC) Griffith University QLD 4111 Brisbane Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hydrogen storage; magnesium-based nanocomposites; multi-component catalyst; Ni-VOx/AC; synergistic effect;

    机译:储氢;镁基纳米复合材料;多组分催化剂;Ni-VOx / AC;协同效应;

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