Ti3C2Tx MXene/Dopamine-Modified Polypyrrole Flexible Composite Electrodes with Application in Energy Storage Devices

Ti3C2Tx MXene is a new 2D material with great potential for supercapacitor applications. Here, we propose a straightforward strategy to fabricate the composite electrode based on MXene. Firstly, the addition of do-pamine-modified polypyrrole (DA-PPy) nanofibers prevents the MXene restacking during the fabrication process of the films by vacuum-assisted filtration and makes it easier for the rapid and reversible inter-calation/deintercalation of ions. And then, the DA-PPy nanofibers provide more conductive channels for the charge carriers and effectively improve the electrochemical performance of the composite films. The composite electrode yielded the highest specific capacitance of 384.9 F g-1 at 1 A g-1 with 86.7 % capaci-tance retention after 3000 cycles at 2 A g-1. The CV curves of the supercapacitor assembled with the composite electrode and the conductive carbon cloth maintain an approximately rectangular shape, dis-playing the relatively ideal capacitive behavior. In addition, the MXene/DA-PPy film shows potential for triboelectric nanogenerator (TENG) applications. The MXene/DA-PPy 9-1 film was combined with the tri-boelectric layer to fabricate the flexible single-electrode type TENG, demonstrating its potential as the practical power source that can power small electronics, and be a promising candidate for energy storage applications. (c) 2023 Elsevier B.V. All rights reserved.