Electrochemical in Situ Tracking of Volumetric Changes in Two-Dimensional Metal Carbides (MXenes) in Ionic Liquids

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• 作者：Nicolas Jäckel ; Benjamin Krüner ; Katherine L. Van Aken ; Mohamed Alhabeb ; Babak Anasori ; Friedrich Kaasik ; Yury Gogotsi ; Volker Presser
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：November 30, 2016
• 年：2016
• 卷：8
• 期：47
• 页码：32089-32093
• 全文大小：406K
• ISSN：1944-8252

文摘

We report the volumetric changes of MXenes in contact with different ionic liquids and the swelling/contraction during electrochemical voltage cycling by complementing electrochemical dilatometry with in situ X-ray diffraction measurements. A drastic, initial, and irreversible volume expansion of MXenes occurs during first contact to ionic liquids (wetting). Voltage cycling evidenced a highly reversible expansion and contraction of electrodes at a very large amplitude of strain (corresponding with max. 12 vol %), which may allow the use of MXene as a high-performance electrochemical actuator.