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 m²g^-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 H₂ adsorption and desorption. In particular, it starts to release hydrogen at about 220 °C, near 170 °C lower than that of the commercial MgH₂, as well it tends to be hydrogenated even at a relatively low temperature of 100 °C by absorbing 3.56 wt% H₂. 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 ΔH 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.

氢化镁（MgH ₂）具有较大的储氢能力，但热力学和动力学释放氢的能力较差。在这项工作中，新型的一维竹形碳纳米管（BCNTs）首先被用作MgH ₂（称为MgH ₂ @BCNTs）自组装的载体。BCNT的高比表面积（262.3 m ² g ^-1）和大直径（超过80 nm）有助于极高的负载量（76.8质量分数），小粒径（15–20 nm）和MgH _2的均匀分布纳米粒子（NPs）。定义明确的MgH ₂ @BCNTs显着改善了H _2的热力学和动力学吸附和解吸。特别是，它开始在约220°C的温度下释放氢，比市售MgH _2的温度低约170°C ，并且即使在100°C的较低温度下，它也易于吸收3.56 wt％的H进行氢化。₂。而且，可逆容量高达5.79 wt％，包括BCNT的“净重”，并且在10个循环后得到了很好的维持。脱氢Ë_一个和Δ ħ的MgH的₂ @BCNTs可以减少到97.97千焦/摩尔和68.92千焦/摩尔，这是111.24千焦/摩尔和6.07千焦/摩尔低于那些商业的MgH的₂分别。通过高压致密化处理，MgH ₂@BCNTs系统可实现高达65.90 g / L的出色容量，而不会出现明显的性能下降，这是由于具有内部间隔的BCNT的特殊结构在750 MPa的超高压下可作为支撑物。我们创新的一维BCNT支持高负载MgH ₂ NP的创新设计提供了新的策略，可在未来同步提高重量和体积容量，以及纳米约束系统的储氢动力学和热力学。