Facile Synthesis of MnO <sub>2</sub> /Ti <sub>3</sub> C <sub>2</sub> T <sub>x</sub> /CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor
Xiuhang Chen, Yong Liu, Qiang Zhou, Fenghua Su
Abstract
Abstract The pseudo‐capacitance material Manganese dioxide (MnO 2 ) is widely used as electrode materials for supercapacitors; however, its poor electrical conductivity hinders the realization of high specific capacitance. Herein, the MnO 2 and Ti 3 C 2 T x (MXene) were deposited on carbon cloth (CC) by a facile two‐step electrodeposition method for synthesizing free‐binder MnO 2 /Ti 3 C 2 T x /CC composite electrode. Benefiting from the excellent conductivity of Ti 3 C 2 T x and the excellent pseudo‐capacitance performance of MnO 2 , the as‐obtained composite electrode exhibited a higher specific capacitance (411.5 F g −1 at the current density of 1 A g −1 ). In addition, all‐solid‐state flexible asymmetric supercapacitors were successfully assembled from the positive electrode of MnO 2 /Ti 3 C 2 T x /CC and the negative electrode of Ti 3 C 2 T x /CC. The as‐assembled supercapacitor presented a large operating voltage of 1.7 V, a high energy density of 24.3 Wh Kg −1 at a power density of 850 W Kg −1 . This work provides a simple and efficient approach to prepare composite electrodes and fabricate all‐solid‐state asymmetric supercapacitors with high electrochemical performances.