MnO 2 @Polyaniline-CNT-boron-doped graphene as a freestanding binder-free electrode material for supercapacitor

Present work is focusing on the easy synthesis of MnO 2 @Polyaniline/Carbon nanotubes/Boron-doped graphene (MnO 2 @PCBG) freestanding, flexible film electrode as a highly efficient current collector and electrode material for supercapacitor application. Boron-doped graphene (BG), CNT and polyaniline (PANI) composite are used to prepare freestanding electrode on Ni foam as a template. PANI, BG and CNT have provided porosity, conducting nature and mechanical strength along with electrical double layer capacitor (EDLC) and pseudocapacitive behaviours. MnO 2 have deposited electrochemically on Polyaniline/Carbon nanotubes/Boron-doped Graphene (PCBG) freestanding material. The combination of EDLC and pseudocapacitive material in PCBG serve as an efficient current collector as well as an electrode for the electrodeposition of MnO 2 . MnO 2 @PCBG exhibits the highest specific capacitance of 1544 F g −1 at 1 A g −1 , along with 84% cycling stability after 5000 cycles. Also, the as-prepared material shows the power density of 2353 W kg −1 and the energy density of 196 Wh kg −1 at 1 A g −1 . The significant improvement in the performance of the MnO 2 @PCBG material might be due to the binder-free growth of MnO 2 nanospheres on the highly efficient current collector.