マグネシウムの可逆的な電気化学的沈殿/溶解のためのデザイナーイオン液体
Tylan Watkins1, Ashok Kumar1, Daniel A Buttry1
1School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287-1604, United States.
Journal of the American Chemical Society
|December 20, 2015
まとめ
ポリエーテル鎖のイオン化液は,可逆的なマグネシウム電解を可能にします. これらのPEGylatedイオン液体は,純粋なデンドライトのないマグネシウム堆積物に対して高いクーロンビック効率と電流密度を示しています.
科学分野:
- 電気化学
- 材料科学
- イオン性液体
背景:
- マグネシウム電解は,受動化とデンドライト形成のために困難です.
- イオン性液は電解質を供給する可能性があるが,効率的なマグネシウム循環のために特別な設計が必要である.
研究 の 目的:
- リバーシブルなマグネシウム電解液体 (PEGylated ILs) を開発し評価する.
- 新しいPEGylated ILsの性能を,従来のイオン液体と,Mgの堆積を比較する.
主な方法:
- PEGylated ionic liquid (MPEG3PyrTFSI,MPEG7PyrTFSI) の合成について
- Mgの堆積/溶解の電気化学的特徴
- XRD,SEM,EDSを用いた材料の特徴づけ
- Mg2+のスペクトル解析 (ラーマン分析)
主要な成果:
- PEGylated ILs,特にMPEG7PyrTFSIは,BMPyrTFSIよりもMg電解を著しく改善しました.
- 高キュロンビック効率 (90%) と電流密度 (2 mA/cm2) を有する純粋なデンドライトのないMg堆積物を生成した.
- ポリエーテル鎖は,Mg2+) 協調球からTFSI ((−)) とBH4 ((−)) を移動させることが示された.
結論:
- 設計されたケラートイオン液体は,効率的で可逆的なMg電解を容易にする.
- マグネシウムとポリエーテル鎖の相互作用は,電気化学的性能の改善の鍵です.
- この研究は,逆転可能なMgサイクルに合わせたイオン液体の最初の実証を示しています.
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