Flexible and High‐Performance MXene/MnO<sub>2</sub> Film Electrodes Fabricated by Inkjet Printing: Toward a New Generation Supercapacitive Application
Dong Wen, Guobing Ying, Lu Liu, Cheng Sun, Yuexia Li, Yinlong Zhao, Ziying Ji, Yiran Wu, Jianxin Zhang, Jianfeng Zhang, Xiang Wang
Abstract
Abstract With the deepening of the commercialization of flexible electronic products, it is urgently needed to develop a handleable solution for the applications of printing high‐performance and wearable energy storage devices. Herein, flexible, low‐cost, and high‐performance MXene/manganese dioxide (MnO 2 ) composite film electrodes are reported to meet this urgent expectation. The MXene‐based composite film electrodes with different MnO 2 content are prepared by inkjet printing using MXene/MnO 2 ink. Characterization and test results show that there is a synergistic effect between MXene and MnO 2 , which can effectively achieve faster electron transfer and shorter diffusion path, thus improving the overall electrochemical performance of the composite. The inkjet‐printed MXene/10 wt% MnO 2 composite film electrode, with an excellent conductivity of 3400 S m −1 , exhibits an ultrahigh volumetric capacitance of 312 F cm −3 and retains 130.8% of the initial capacitance after 5000 charge/discharge cycles. Moreover, the fabricated flexible symmetrical supercapacitor shows a superior areal energy density of 0.51 μWh cm −2 at a power density of 12.5 μW cm −2 . Taken together, inkjet printing technology provides a low‐cost, large‐area manufacturing route for different MXene‐based composites, which are expected to promote the development of novel energy storage technologies that exploit the attractions of MXene.