Electrochemical in Situ Tracking of Volumetric Changes in Two-Dimensional Metal Carbides (MXenes) in Ionic Liquids.
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.
['Jäckel|Nicolas|N|', 'Krüner|Benjamin|B|', 'Van Aken|Katherine L|KL|', 'Alhabeb|Mohamed|M|', 'Anasori|Babak|B|', 'Kaasik|Friedrich|F|', 'Gogotsi|Yury|Y|', 'Presser|Volker|V|']
MXene ionic liquid electrochemical dilatometry in situ XRD pseudocapacitance