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首页> 外文期刊>Nano Energy >Novel 1D carbon nanotubes uniformly wrapped nanoscale MgH2 for efficient hydrogen storage cycling performances with extreme high gravimetric and volumetric capacities
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Novel 1D carbon nanotubes uniformly wrapped nanoscale MgH2 for efficient hydrogen storage cycling performances with extreme high gravimetric and volumetric capacities

机译：新型1D碳纳米管均匀包裹纳米级MGH2，具有极高的重量和体积容量的有效储氢循环性能

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摘要

Magnesium hydride (MgH2) offers large capacity for hydrogen storage, but poor thermodynamics and kinetics for releasing hydrogen. In this work, the novel 1D bamboo-shaped carbon nanotubes (BCNTs) are firstly used as carriers for the self-assembly of MgH2 (denoted as MgH2@BCNTs). The high specific surface area (262.3 m(2)g(-1)) and large diameter (over 80 nm) of BCNTs contribute to extremely high loading capacity (76.8 mass fraction), small particle size (15-20 nm) and uniform distribution of MgH2 nanoparticles (NPs). The well-defined MgH2@BCNTs shows remarkably improved thermodynamics and kinetics for H-2 adsorption and desorption. In particular, it starts to release hydrogen at about 220 degrees C, near 170 degrees C lower than that of the commercial MgH2, as well it tends to be hydrogenated even at a relatively low temperature of 100 degrees C by absorbing 3.56 wt% H-2. Moreover, a reversible capacity up to 5.79 wt%, including the "dead weight" of BCNTs, and is well maintained after 10 cycles. The dehydrogenation E-a and Delta H of MgH2@BCNTs can be reduced to 97.97 kJ/mol and 68.92 kJ/mol, which are 111.24 kJ/mol and 6.07 kJ/mol lower than those of the commercial MgH2, respectively. By high pressure densification treatment, the MgH2@BCNTs system achieves an exceptional volumetric capacity up to 65.90 g/L without obvious performance degeneration, resulting from the special structure of BCNTs with inner intervals which works as supports under ultra-high pressure of 750 MPa. Our innovative design of 1D BCNTs supporting MgH2 NPs with high loading weight offers new strategy to synchronously improve the gravimetric and volumetric capacity, as well as the hydrogen storage kinetics and thermodynamics of the nanoconfinement system in the future.
机译：氢化镁（MGH2）为储氢提供大容量，但用于释放氢的热力学和动力学差。在这项工作中，新颖的1D竹形碳纳米管（BCNT）首先用作MGH2的自组装的载体（表示为MgH2 @ BCNT）。 BCNT的高比表面积（262.3M（2）g（-1））和大直径（超过80nm）有助于极高的负载能力（76.8质量分数），小粒径（15-20nm）和均匀MGH2纳米粒子（NPS）的分布。明确定义的MGH2 @ BCNTS显示出显着改善的热力学和用于H-2吸附和解吸的动力学。特别地，它开始在大约220℃下释放氢，接近170℃，低于商业MGH2，也倾向于通过吸收3.56wt％H-即使在100℃的相对低温下升温也趋于氢化。 2。此外，可逆容量高达5.79重量％，包括BCNT的“止返重量”，并且在10个循环后保持良好。 MGH2 @ BCNT的脱氢E-A和DELTA H可以降至97.97kJ / mol和68.92kJ / mol，分别比商业MGH2的111.24kJ / mol，6.07kJ / mol。通过高压致密化处理，MGH2 @ BCNTS系统可实现高达65.90克/升的特殊容量，而无明显性能变性，由BCNT的特殊结构具有内部间隔，其适用于750MPa的超高压下的支撑。我们支持高负荷重量的MGH2 NPS的1D BCNT的创新设计提供了同步提高重量和容量的新策略，以及未来纳米罚系统的储氢动力学和热力学。

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