NaAlH₄ has been widely regarded as a potential hydrogen storage material due to its favorable thermodynamics and high energy density. The high activation energy barrier and high dehydrogenation temperature, however, significantly hinder its practical application. In this paper, CeO₂ hollow nanotubes (HNTs) prepared by a simple electrospinning technique are adopted as functional scaffolds to support NaAlH₄ nanoparticles (NPs) towards advanced hydrogen storage performance. The nanoconfined NaAlH₄ inside CeO₂ HNTs, synthesized via the infiltration of molten NaAlH₄ into the CeO₂ HNTs under high hydrogen pressure, exhibited significantly improved dehydrogenation properties compared with both bulk and ball-milled CeO₂ HNTs-catalyzed NaAlH₄. The onset dehydrogenation temperature of the NaAlH₄@CeO₂ composite was reduced to below 100 °C, with only one main dehydrogenation peak appearing at 130 °C, which is 120 °C and 50 °C lower than for its bulk counterpart and for the ball-milled CeO₂ HNTs-catalyzed NaAlH₄, respectively. Moreover, ∼5.09 wt% hydrogen could be released within 30 min at 180 °C, while only 1.6 wt% hydrogen was desorbed from the ball-milled NaAlH₄ under the same conditions. This significant improvement is mainly attributed to the synergistic effects contributed by the CeO₂ HNTs, which could act as not only a structural scaffold to fabricate and confine the NaAlH₄ NPs, but also as an effective catalyst to enhance the hydrogen storage performance of NaAlH₄.

中文翻译：

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将CeAl ₂空心纳米管内的NaAlH ₄纳米粒子封闭，以提高氢存储

NaAlH ₄由于其良好的热力学和高能量密度而被广泛认为是潜在的储氢材料。然而，高的活化能垒和高的脱氢温度严重阻碍了其实际应用。在本文中，通过简单的静电纺丝技术制备的CeO ₂空心纳米管（HNT）被用作功能支架，以支持NaAlH ₄纳米颗粒（NP）的先进的储氢性能。所述nanoconfined NaAlH ₄内的CeO _2个HNTS，合成通过熔融NaAlH的浸润₄进入的CeO ₂与本体和球磨CeO ₂ HNTs催化的NaAlH ₄相比，高氢压下的HNTs表现出显着改善的脱氢性能。NaAlH ₄ @CeO ₂复合材料的起始脱氢温度降低到100°C以下，只有一个主要的脱氢峰出现在130°C，比其本体和对应的低氢脱氢峰分别低120°C和50°C。球磨CeO ₂ HNTs催化的NaAlH ₄。此外，在180°C下30分钟内可释放出约5.09 wt％的氢，而球磨NaAlH ₄仅解吸了1.6 wt％的氢。在相同条件下。这种显着改善主要归因于CeO ₂ HNT的协同作用，它不仅可以作为结构支架来制造和限制NaAlH ₄ NP，而且可以作为提高NaAlH ₄储氢性能的有效催化剂。。