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首页> 外文期刊>Nanotechnology >The structural characterization and H_2 sorption properties of carbon-supported Mg_(1-x) Ni_x nanocrystallites
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The structural characterization and H_2 sorption properties of carbon-supported Mg_(1-x) Ni_x nanocrystallites

机译：碳载Mg_（1-x）Ni_x纳米微晶的结构表征和H_2吸附性能

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Magnesium (hydride) is a promising system for the reversible on-board storage of hydrogen, but suffers from slow sorption kinetics and a high thermodynamic stability of the hydride. We explored a combined approach to tackle these problems: nanosizing and carbon-supporting the magnesium, and doping it with nickel. Samples were prepared by melt infiltration with magnesium of nanoporous carbon onto which 1-12 wt% nickel nanoparticles had been predeposited. For loadings up to 15 wt% MgH_2, 10-30 nm crystallites with different compositions were formed inside the porous carbon, each giving a specific H_2 desorption signature. Surprisingly, higher Mg loadings resulted in more homogeneously mixed samples, which was due to the facilitated wetting of the carbon with the magnesium due to the presence of nickel. Hydrogen release temperatures close to that of Mg_2NiH_4 were observed for high MgH_2 loadings (50 wt%) and small amounts of Ni (Mg_(0.95)Ni_(0.05)). The favourable H_2 desorption properties could mainly be attributed to excellent kinetics due to the efficient mixing of magnesium, nickel and carbon on the nanoscale.
机译：镁（氢化物）是一种可逆的车载氢存储系统，但氢化物的吸附动力学慢且热力学稳定性高。我们探索了一种综合的方法来解决这些问题：对镁进行纳米化和碳负载，并用镍进行掺杂。通过用纳米多孔碳的镁熔融渗透来制备样品，在纳米多孔碳上已经预先沉积了1-12wt％的镍纳米颗粒。为了负载高达15 wt％的MgH_2，在多孔碳内部形成了具有不同组成的10-30 nm的微晶，每个微晶都具有特定的H_2解吸特征。出乎意料的是，较高的Mg含量导致样品混合更均匀，这是由于镍的存在促进了碳与镁的润湿。对于高含量的MgH_2（50 wt％）和少量的Ni（Mg_（0.95）Ni_（0.05）），观察到氢释放温度接近Mg_2NiH_4。有利的H_2解吸性能主要归因于在纳米级上镁，镍和碳的有效混合而产生的出色动力学。

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