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

作者：Chen, Xiuhang; Liu, Yong^*; Zhou, Qiang; Su, Fenghua^*

来源：ChemistrySelect, 2020, 5(46): 14768-14775.

DOI：10.1002/slct.202004181

• Asymmetric supercapacitor
• Electrochemistry
• Electrophoresis
• MnO2
• Ti3C2Tx (MXene)

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 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 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 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.

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