Effects of carbon nanomaterials and MXene addition on the performance of nitrogen doped MnO2 based supercapacitors

Nitrogen-doped composites have the potential to achieve well electrochemical performance by enabling convenient contact of the electrolyte ions for carbon-based materials. A good combination of metal oxide and carbonaceous material is a critical challenge in the development of composites. Herein, we demonstrate a highly capacitive and superior cycle performance of MnO 2 based supercapacitor electrodes. The addition of different forms of carbon nanomaterials (carbon nanotube and graphene) and MXene is particularly studied. MnO 2 based composite materials are capable of capacitance retention over 95%, with high specific capacitance compared to pure N -doped MnO 2 . The highest specific capacitance was achieved with MXene based MnO 2 composite, which exhibits 457 Fg -1 , at a current density of 1 A g −1 with extreme cycling efficiency (102.5%, after 1000 cycles). High conductivity and large surface area are stimulated by the propitious interaction between MnO 2 and nanoscale materials, resulting in superior supercapacitor efficiency. This study highlights the possible potential of carbon-based MnO 2 composite electrodes which could be useful for future energy storage applications.