Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH2,Inorganic Chemistry Frontiers

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Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH2
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-06-13 , DOI: 10.1039/d2qi00863g
Mengchen Song ₁ , Liuting Zhang _{1,

2} , Zhendong Yao ₃ , Jiaguang Zheng ₁ , Danhong Shang ₄ , Lixin Chen ₅ , Hong Li ₂

Affiliation

Maintaining fast hydrogen storage kinetics is a key challenge for the practical application of MgH₂. To address this challenge, understanding the mechanism of kinetics that declines during cycling is crucial but it has not been systematically investigated to date. In this paper, three different Fe nanocatalysts were synthesized and then doped into MgH₂ to form new composites. The MgH₂-Fe composite had significantly reduced operating temperatures and activation energy compared to that of undoped MgH₂. During cycling, a capacity retention of 93.4% was obtained after the 20^th cycle. For a better understanding of the declining performance, prolonged incubation was intentionally performed. Grain growth was found in MgH₂ and the Fe nanocatalysts, which was directly responsible for capacity loss and kinetic degradation. These findings provide fundamental insights to facilitate designing and preparing catalytic hydrogen storage systems with superior cycling performance.

中文翻译：

揭示 Fe 纳米催化剂改性 MgH2 储氢性能的降解机制

保持快速的储氢动力学是 MgH ₂实际应用的关键挑战。为了应对这一挑战，了解循环过程中下降的动力学机制至关重要，但迄今为止尚未对其进行系统研究。在本文中，合成了三种不同的Fe纳米催化剂，然后将其掺杂到MgH ₂中以形成新的复合材料。_{与未掺杂的MgH 2}相比， MgH ₂ -Fe 复合材料的工作温度和活化能显着降低。在循环过程中，第 20^{次后获得了 93.4% 的容量保持率}循环。为了更好地了解性能下降，特意进行了长时间的孵育。_{在 MgH 2}和 Fe 纳米催化剂中发现晶粒生长，直接导致容量损失和动力学退化。这些发现为促进设计和制备具有优异循环性能的催化储氢系统提供了基本见解。

更新日期：2022-06-13

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