English
Ti3C2TX MXene has the advantages of metal conductivity, ultra-high volume capacitance, and effective absorption of electromagnetic waves, and is considered a promising cornerstone for fiber manufacturing; However, due to contradictions in material design, MXene based fibers rarely simultaneously improve electrochemical charge storage and conductivity/thermal management. Usually, in order to enhance intra/inter chip electron transfer, it is highly necessary to arrange and densely stack MXene fibers; However, the narrow interlayer spacing limits the kinetics of ion diffusion (insertion/deintercalation of electrolyte ions) and reduces accessible charge storage active sites. Here, the electron and ion transport of Ti3C2TX MXene fibers is synergistically facilitated by a unique dot sheet heterostructure, which is covalently bound by Ti-C-Ti, providing optimal interlayer spacing for rapid ion diffusion and enhancing intra/inter sheet crosslinking for fast electron transport. Therefore, the conductivity of the obtained fibers increased by 2405 S cm − 1, with a capacitance of 1597 F cm − 3. The energy density of the assembled supercapacitor reached 19.8 mWh cm − 3, with excellent Joule heating performance and high photothermal temperature. These outstanding features make it practically applicable in energy supply scenarios, such as powering LEDs and wearable thermal management.
