Structural and electrochemical investigation of novel hybridized MnO2/V2O5 nanocomposites prepared by one-step microwave-assisted method for electrochemical supercapacitor application

Pure V 2 O 5 and MnO 2 /V 2 O 5 hybrid nanocomposites were synthesized by microwave-assisted method for electrochemical supercapacitor application. X-ray diffraction analysis showed the orthorhombic structure for pure V 2 O 5 and MnO 2 /V 2 O 5 nanocomposites that showed the mixed state of the orthorhombic and orthogonal phase structure of V 2 O 5 and MnO 2 . The average crystalline sizes were calculated as 14 nm and 17 nm for pure V 2 O 5 and MnO 2 /V 2 O 5 nanocomposites. Scanning electron microscopy and Field emission scanning electron microscopy image analysis demonstrated the mixed state of nanoplate and small rod-like shape for V 2 O 5 and it was transformed to nanobeads shape by the addition of MnO 2 . The Energy Dispersive X-Ray Analysis confirmed the presence of V and Mn compounds in the as-prepared nanocomposites. The porous nature of nanostructures was studied by Brunauer–Emmett–Teller analysis. Finally , the electrochemical analysis was recorded in 3.5 M KOH and 1 M H 2 SO 4 electrolytes to compare its performance and suitability. The pure V 2 O 5 nanostructure showed the maximum capacitance of 150 F/g and 95 F/g in KOH and H 2 SO 4 electrolytes. The specific capacitance of V 2 O 5 was enhanced to 570 F/g for the addition of 6 wt% of MnO 2 in 3.5 M KOH electrolyte, whereas, in 1 M H 2 SO 4 electrolyte, the specific capacitance was 269 F/g for the addition of 6 wt% of MnO 2.