Self-assembled MXene(Ti3C2Tx)/α-Fe2O3 nanocomposite as negative electrode material for supercapacitors

To further improve the electrochemical performance of MXene materials, MXene(Ti3C2Tx)/alpha-Fe2O3 nanocomposites are fabricated by a self-assembly method via electrostatic attraction between negatively charged Ti3C2Tx MXenesand positively charged cocoa-like alpha-Fe2O3 nanoparticles at room temperature. As a negative electrode material, the resulting nanocomposites show excellent electrochemical performance, including a wide operating potential of 1.2 V (-1.2-0 V), a high specific capacitance of 405.4 F g(-1) at the current density of 2 A g(-1) and a specific capacitance of 197.6 F g(-1) even at the current density of 20 A g(-1) in 5 M LiCl. In addition, the nanocomposites possess a high cycling stability with 97.7% capacitance retention of the initial capacitance after 2000 cycles. The impressive results indicate that the prepared MXene(Ti3C2Tx)/alpha-Fe2O3 nanocomposites is a promising negative electrode material for supercapacitor. The self-assemble of MXenes and metal oxides will provide more opportunities for their application in energy storage. (C) 2018 Elsevier Ltd. All rights reserved.