Influence of Complexing Additives on the Reversible Deposition/Dissolution of Magnesium in an Ionic Liquid,ChemElectroChem

当前位置： X-MOL 学术 › ChemElectroChem › 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.)

Influence of Complexing Additives on the Reversible Deposition/Dissolution of Magnesium in an Ionic Liquid
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-01-07 , DOI: 10.1002/celc.202001488
Isabella Weber ₁ , Johannes Ingenmey ₂ , Johannes Schnaidt ₁ , Barbara Kirchner ₂ , R. Juergen Behm ₃

Affiliation

Aiming at a fundamental understanding of the synergistic effects of different additives on the electrochemical Mg deposition/dissolution in an ionic liquid, we have systematically investigated these processes in a combined electrochemical and theoretical study, using 1‐butyl‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMP‐TFSI) as the solvent and a cyclic ether (18‐crown‐6) and magnesium borohydride as additives. Both crown ether and BH₄⁻ improve Mg deposition, its reversibility, and cycling stability. The combined presence of both additives and their concentration relative to that of Mg²⁺ are decisive for more facile and reversible Mg deposition/dissolution. These results and those of quantum chemical calculations indicate that 18‐crown‐6 can partly displace TFSI⁻ from its direct coordination to Mg²⁺. Furthermore, the interaction between Mg²⁺ and directly coordinated TFSI⁻ is weakened by coordination with 18‐crown‐6, preventing its Mg⁺‐induced decomposition. Finally, Mg deposition is improved by the weaker overall coordination upon Mg²⁺ reduction to Mg⁺.

中文翻译：

络合添加剂对离子液体中镁的可逆沉积/溶解的影响

为了对不同添加剂对离子液体中电化学Mg沉积/溶解的协同作用有基本的了解，我们使用1-丁基-1-甲基吡咯烷鎓双（三氟甲基磺酰基）对电化学和理论研究进行了系统的研究酰亚胺（BMP-TFSI）作为溶剂，环醚（18-crown-6）和硼氢化镁作为添加剂。两个冠醚和BH ₄^-提高镁沉积，其可逆性和循环稳定性。两种添加剂的组合存在及其相对于Mg ^2+的浓度对于更容易和可逆地沉积/溶解镁至关重要。这些结果和量子化学计算的表明，18冠6可以部分取代TFSI ^-从它的直接协调与Mg ²⁺。此外，镁之间的相互作用²⁺协调TFSI和直接^-通过配位与18-冠-6，防止其镁减弱⁺诱导的分解。最后，在将Mg ²⁺还原为Mg ⁺时，通过较弱的整体配比可以改善Mg的沉积。

更新日期：2021-01-26

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11