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Effect of metal type and loading on hydrogen storage on NaAlH_4

机译：金属类型和负载量对NaAlH4中储氢的影响

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摘要

Although hydrogen has a great potential as clean energy, safe practical storage of hydrogen for applications such as fuel cells has been a major challenge. NaAlH_4 is one of the metal hydrides, which are candidates for hydrogen storage in vehicles. However, the rather slow absorption/desorption kinetics is still a significant drawback. To alleviate this problem, purified NaAlH_4 was ground with TiCl_3, ZrCl_4, or HfCl_4. Desorption kinetics and capacities were observed under TPD-like operation. Absorption efficiency was determined by raising the temperature up to 125℃. Of the three doped metals investigated for the positive effect on facilitating NaAlH_4 decomposition, TiCl_3 assists the best on the first reaction while ZrCl_4 and HfCl_4 do for the second one. Despite the kinetics enhancement directly involves with the ZrCl_4 amount, there is a threshold of ZrCl_4-content which affects. 6% ZrCl_4 is considered as an appropriate amount to improve the hydrogen release because it simultaneously decreases the desorption temperature and gives the outstanding rate. In hydrogen desorption, ZrCl_4 provides the most amount of released hydrogen, but for hydrogen absorption TiCl_3-doped NaAlH_4 possesses the highest capacity. It is believed that the metal size is one of the key factors resulting in such the behavior.
机译：尽管氢具有作为清洁能源的巨大潜力，但是对于诸如燃料电池之类的应用来说，安全，实用地存储氢一直是主要的挑战。 NaAlH_4是金属氢化物之一，是车辆中储氢的候选金属。但是，相当慢的吸收/解吸动力学仍然是一个重大缺点。为了减轻这个问题，将纯化的NaAlH_4与TiCl_3，ZrCl_4或HfCl_4一起研磨。在类TPD操作下观察到解吸动力学和容量。通过将温度升高到125℃来确定吸收效率。在三种对促进NaAlH_4分解具有积极作用的掺杂金属中，TiCl_3在第一个反应中起最佳作用，而ZrCl_4和HfCl_4在第二个反应中起最佳作用。尽管动力学增强直接涉及ZrCl_4的量，但仍有一个影响的ZrCl_4-含量阈值。 6％ZrCl_4被认为是改善氢释放的合适量，因为它同时降低了解吸温度并给出了出色的速率。在氢解吸中，ZrCl_4提供最大量的释放的氢，但对于氢吸收，掺杂TiCl_3的NaAlH_4具有最高的容量。据信，金属尺寸是导致这种行为的关键因素之一。

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