Rational design of flower-like MnO/TiCTcomposite electrode for high performance supercapacitors.

Combining the new two-dimensional conductive MXene with transition metal oxide to build composite structure is a promising path to improve the conductivity of metal oxide. However, a critical challenge still remains in how to achieve a good combination of MXene and metal oxide. Herein, we develop a facile hydrothermal route to synthesize the MnO/TiCTcomposite electrode for supercapacitors by synergistically coupling MnOnanowires with TiCTMXene nanoflakes. Compared with the pure MnOelectrode, the morphology of the MnO/TiCTcomposite electrode changes from nanowires to nanoflowers. Moreover, the overall conductivity and electrochemical performance of the composite electrode are greatly improved due to an addition of TiCTMXene. The specific capacitance of the MnO/TiCTcomposite electrode achieves 210.8 F·gat a scan rate of 2 mV·s, while that of the pure MnOelectrode is only 55.2 F·g. Furthermore, the specific capacitance of the MnO/TiCTcomposite electrode still can remain at 97.2% even after 10 000 charge-discharge cycles, revealing an excellent cycle stability. The synthesis strategy of this work can pave the way for the research and practical application of the electrode materials for supercapacitors.