LiAlH4 纳米颗粒封装在金属钛壳中以增强储氢能力,ACS Applied Nano Materials

当前位置： X-MOL 学术 › ACS Appl. Nano Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

LiAlH4 纳米颗粒封装在金属钛壳中以增强储氢能力
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-10-21 , DOI: 10.1021/acsanm.2c03483
Chulaluck Pratthana ₁ , Kondo-Francois Aguey-Zinsou ₁

Affiliation

氢化铝锂(LiAlH ₄ )由于其高重量储氢密度而被认为是一种有前途的储氢材料。然而，缓慢的氢动力学和较差的可逆性阻碍了其在实际应用中的使用。已经提出通过材料的纳米结构方法改进LiAlH ₄的氢性质。在此，我们开发了一种方法，通过在其表面还原 TiCl _{3将独立的 LiAlH}₄纳米粒子封装在 Ti 壳中。LiAlH ₄@通过精确控制还原动力学和 Ti 前体浓度获得的 Ti 核壳纳米结构导致脱氢温度和解吸动力学的显着改善。实际上，在 150 °C 下， LiAlH ₄ @Ti 在 25 分钟内释放了 5.8 质量％的氢。更值得注意的是，核壳结构的形成导致众所周知的 LiAlH ₄放热分解路径消失，这证明了改变 LiAlH _{4的氢热力学的可能性}. 在 150 °C 和 10 MPa 氢压下观察到部分氢可逆性，这主要是因为氢循环时核壳结构的损失。然而，这表明通过更好地控制 LiAlH ₄的纳米结构，可以实现实用的储氢条件。

"点击查看英文标题和摘要"

LiAlH4 Nanoparticles Encapsulated within Metallic Titanium Shells for Enhanced Hydrogen Storage

Lithium aluminum hydride (LiAlH₄) is considered as a promising hydrogen storage material due to its high gravimetric hydrogen storage density. However, sluggish hydrogen kinetics and poor reversibility have prevented its use in practical applications. Improvements of the hydrogen properties of LiAlH₄ have been proposed through a nanostructuring approach of the material. Herein, we developed a method to encapsulate freestanding LiAlH₄ nanoparticles within a Ti shell upon reduction of TiCl₃ at their surface. The LiAlH₄@Ti core–shell nanostructures obtained through precise control in the reduction kinetics and the concentration of the Ti precursor led to a significant improvement in the dehydrogenation temperatures and desorption kinetics. Indeed, 5.8 mass % of hydrogen was released within 25 min at 150 °C from LiAlH₄@Ti. More remarkably, the formation of the core–shell structure led to the disappearance of the well known exothermic decomposition path of LiAlH₄, which evidenced the possibility of altering the hydrogen thermodynamics of LiAlH₄. Partial hydrogen reversibility was observed at 150 °C and a 10 MPa hydrogen pressure, mainly because of the loss of the core–shell structure upon hydrogen cycling. However, this demonstrates that with finer control over the nanostructuring of LiAlH₄, practical hydrogen storage conditions are within reach.

更新日期：2022-10-21

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南