溶剂化
离子液体
离子
化学物理
水溶液中的金属离子
三氟甲磺酸
分子动力学
溶剂化壳
离子键合
化学
金属
材料科学
计算化学
有机化学
催化作用
作者
Tuan Anh Pham,Corie Horwood,Amitesh Maiti,Vanessa N. Peters,Thomas L. Bunn,Michael Stadermann
标识
DOI:10.1021/acs.jpcb.8b10559
摘要
Understanding the behavior of metal ions in room temperature ionic liquids (ILs) is essential for predicting and optimizing performance for technologies like metal electrodeposition; however, many mechanistic details remain enigmatic, including the solvation properties of the ions in ILs and how they are governed by the intrinsic interaction between the ions and the liquid species. Here, we utilize first-principles molecular dynamics simulations to unravel and compare the key structural properties of Ag+ and Cu+ ions in a common room temperature IL, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate. We find that, when compared to Cu+, the larger Ag+ shows a more disordered and flexible solvation structure with a more frequent exchange of the IL species between its solvation shells. In addition, our simulations reveal an interesting analog in the solvation behavior of the ions in the IL and aqueous environments, particularly in the effect of the ion electronic structures on their solvation properties. This work provides fundamental understanding of the intrinsic properties of the metal ions in the IL, while offering mechanistic understanding and strategy for future selection of ILs for metal electrodeposition processes.
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