Facile Synthesis of MnO2/Ti3C2Tx/CC as Positive Electrode of All-Solid-State Flexible Asymmetric Supercapacitor

摘要

The pseudo-capacitance material Manganese dioxide(MnO2)is widely used as electrode materials for supercapacitors;however,its poor electrical conductivity hinders the realization of high specific capacitance.Herein,the MnO2 and Ti3C2Tx(MXene)were deposited on carbon cloth(CC)by a facile two-step electrodeposition method for synthesizing free-binder MnO2/Ti3C2Tx/CC composite electrode.Benefiting from the excellent conductivity of Ti3C2Tx and the excellent pseudo-capacitance performance of MnO2,the as-obtained composite electrode exhibited a higher specific capacitance(411.5 Fg~(-1)at the current density of 1 Ag~(-1)).In addition,all-solid-state flexible asymmetric supercapacitors were successfully assembled from the positive electrode of MnO2/Ti3C2Tx/CC and the negative electrode of Ti3C2Tx/CC.The as-assembled supercapacitor presented a large operating voltage of 1.7 V,a high energy density of 24.3 WhKg~(-1)at a power density of 850 WKg~(-1).This work provides a simple and efficient approach to prepare composite electrodes and fabricate all-solid-state asymmetric supercapacitors with high electrochemical performances.