Ultrafine nanoporous aluminum by electrolytic dealloying of aluminum-magnesium alloys in glyme-based electrolytes with recovery of sacrificial magnesium
Ultrafine nanoporous aluminum by electrolytic dealloying of aluminum-magnesium alloys in glyme-based electrolytes with recovery of sacrificial magnesium
复制标题
DOI：
10.1016/j.scriptamat.2022.114959
复制
发表时间：
2022
影响因子：
6
通讯作者：
Timothy Lee;Hyeong‐Jun Koh;Alexander K. Ng;Jiaxin Liu;E. Stach;E. Detsi
中科院分区：
文献类型：
--
作者：
Timothy Lee;Hyeong‐Jun Koh;Alexander K. Ng;Jiaxin Liu;E. Stach;E. Detsi
采用非水电解液的无空气电解脱合金法是一种可持续发展的方法，可以在回收牺牲镁的同时，从铝镁母合金中制备出具有高活性纳米级韧带的纳米孔铝(NP-Al)。然而，这种合成策略的通用性受到了限制，因为可传导镁离子的非水电解液数量很少，到目前为止，仅被证明适用于由Lewis碱C₆H₅ClMg的两个当量物与四氢呋喃中的Lewis酸AlCl3的一个当量物之间的现场作用而得到的全苯基络合物电解液。在这里，我们证明了最近在镁离子电池领域引入的由MgCl2/AlCl3/Mg(TFSI)2(或MACT)组成的新的电解液也可以用来产生NP-Al。这种替代电解液表现出比APC更高的电化学性能，并且可以生成超细的NP-Al，其≈韧带尺寸为6-14 nm，小于通常使用APC获得的≈韧带尺寸10-20 nm。
Air-free electrolytic dealloying using non-aqueous electrolytes is a sustainable method for creating nanoporous Al (NP-Al) with highly reactive nanoscale-sized ligaments from Al-Mg parent alloys while simultaneously recovering the sacrificial Mg. However, this synthesis strategy is limited in versatility by the low number of available non-aqueous electrolytes that can conduct Mg ions and has so far only been proven to work with all-phenyl complex (APC) electrolyte derived fromin situreaction between two equivalents of Lewis base C₆H₅ClMg and one equivalent of Lewis acid AlCl3in tetrahydrofuran (THF) solvent. Here we demonstrated that a new electrolyte consisting of MgCl2/AlCl3/Mg(TFSI)2(or MACT) in glyme-based solvents recently introduced in the Mg-ion battery community can also be used to create NP-Al. This alternative electrolyte exhibits higher electrochemical performance than APC and can create ultrafine NP-Al with ≈ 6–14 nm ligament size, which is smaller than the ≈ 10–20 nm ligament size commonly achieved using APC.