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摘要:In view of the upcoming energy change towards renewables and synthetic fuels,the storage of energy carriers,specifically hydrogen,has a crucial role.The practical conditions for technological exploitation of hydrogen have a defined operative range of temperature and pressure.Complex hydrides are promising materials for hydrogen storage because of their high gravimetric hydrogen capacity.Composites and nanostructure are used in this work to achieve destabilization of stable complex hydrides or stabilization of unstable ones in order to match the operative range of working temperature.The use of the interaction of two hydrides is a well-known concept used to increase the hydrogen equilibrium pressure of composite mixtures in comparison to that of pure systems.The thermodynamics and reaction kinetics of such hydride composites are reviewed and experimentally verified using the example NaBH4 + MgH2.The observed destabilization is in quantitative agreement with the calculated thermodynamic properties,including enthalpy and entropy.The results are discussed with respect to kinetic limitations of the hydrogen desorption mechanism at interfaces.A totally different approach to handle materials for hydrogen storage is the stabilization of unstable complex hydrides.These materials decompose at room temperature and therefore are difficult to store.The effect of nanostructured porous media on the stabilization of these hydrides will be presented and the perspective of this research pointed out.
会议名称:

2015第一届国际智能材料大会

会议时间:

2015-03-23

会议地点:

韩国釜山

  • 专辑:

    工程科技Ⅰ辑

  • 专题:

    材料科学

  • 分类号:

    TB33

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