在氧化石墨烯框架中增强纳米限制 NaAlH4 的储氢动力学和空气稳定性,RSC Advances

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在氧化石墨烯框架中增强纳米限制 NaAlH4 的储氢动力学和空气稳定性
RSC Advances ( IF 3.9 ) Pub Date : 2021-10-04 , DOI: 10.1039/d1ra05111c
Hyung Wan Do ₁ , HyeonJi Kim ₁ , Eun Seon Cho ₁

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随着对气候变化的日益关注，氢气为脱碳提供了广泛的机会，并为整个能源系统提供了灵活性。虽然氢能已经进入工业领域，但物理储氢系统带来了巨大的挑战，为安全高效的固态储氢提供了动力。适应这种需求，铝酸钠（NaAlH ₄）由于其高存储容量而被认为是候选材料之一。然而，它需要高温才能解吸氢，并且在暴露于空气时会不可逆地变得不活泼。为了增强缓慢的反应动力学并降低氢解吸温度，可以将NaAlH ₄限制在多孔纳米支架中；然而，纳米限制的 NaAlH₄具有足够的储氢性能和足够的稳定性到目前为止尚未得到证实。在这项工作中，我们展示了限制在纳米多孔氧化石墨烯框架 (GOF) 中的_{NaAlH 4}颗粒同时增强的储氢性能和空气稳定性GOF的结构被精心优化为纳米支架，NaAlH₄通过初湿浸渍渗透到GOF的孔隙中_{由于纳米限制，在没有过渡金属催化剂的情况下，NaAlH 4}的氢解吸的起始温度和活化能均显着降低，同时在环境条件下实现了稳定性。

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Enhanced hydrogen storage kinetics and air stability of nanoconfined NaAlH4 in graphene oxide framework

With a growing concern over climate change, hydrogen offers a wide range of opportunities for decarbonization and provides a flexibility in overall energy systems. While hydrogen energy is already plugged into industrial sectors, a physical hydrogen storage system poses a formidable challenge, giving momentum for safe and efficient solid-state hydrogen storage. Accommodating such demands, sodium alanate (NaAlH₄) has been considered one of the candidate materials due to its high storage capacity. However, it requires a high temperature for hydrogen desorption and becomes inactive irreversibly upon air-exposure. To enhance sluggish reaction kinetics and reduce the hydrogen desorption temperature, NaAlH₄ can be confined into a porous nanoscaffold; however, nanoconfined NaAlH₄ with sufficient hydrogen storage performance and competent stability has not been demonstrated so far. In this work, we demonstrate a simultaneously enhanced hydrogen storage performance and air-stability for NaAlH₄ particles confined in a nanoporous graphene oxide framework (GOF). The structure of the GOF was elaborately optimized as a nanoscaffold, and NaAlH₄ was infiltrated into the pores of the GOF via incipient wetness impregnation. As a result of the nanoconfinement, both the onset temperature and activation energy for hydrogen desorption of NaAlH₄ are significantly decreased without transition metal catalysts, while simultaneously achieving the stability under ambient conditions.

更新日期：2021-10-04

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