Facile synthesis of MXene/MnO2 composite with high specific capacitance
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Ti3C2Tx is one of the typical MXene materials, where Tx stands for various surface terminations (OH, O, and/or F groups). In this paper, the delaminated Ti3C2Tx, referred to as d-Ti3C2Tx, and MnO2 composites were prepared by a simple synthesis method. The substrate of the composite is the conductive d-Ti3C2Tx sheet. The MnO2 was grown on the surface of d-Ti3C2Tx and it can increase the specific capacitance of the composite. At the same time, the d-Ti3C2Tx substrate can provide a carrier for the growth and uniform dispersion of MnO2. Therefore, the d-Ti3C2Tx/MnO2 composite has high specific capacitance and good cycle stability. At a current density of 1 A g−1, the d-Ti3C2Tx/MnO2 composite has a specific capacitance of 242 F g−1, which is three times than that of Ti3C2Tx. The electrode capacitance retention rate can still reach 97% after 5000 cycles of galvanostatic charge and discharge.
KeywordsMXene Ti3C2Tx MnO2 Capacitance performance Supercapacitors
The research was financially supported by the Programmed for Changing Scholars and Innovative Research Team in University (IRT_15R56), the National Natural Science Foundation of China (Grant Nos. 51462032 and 21664012), the Innovation Team Basic Scientific Research Project of Gansu Province (1606RJIA324), Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, and Key Laboratory of Polymer Materials of Gansu Province.