Electrosynthesised Metal (Ni, Fe, Co) Oxide Films on Single‐Walled Carbon Nanotube Platforms and Their Supercapacitance in Acidic and Neutral pH Media

Supercapacitive properties of Single‐walled carbon nanotubes/metal oxides nanocomposites (SWCNT‐MO where M=Ni, Fe, Co) have been described. The SWCNT‐MO nanocomposites was confirmed with SEM, EDX and XPS techniques. Supercapacitive properties of the modified electrodes in H 2 SO 4 and Na 2 SO 4 electrolytes was investigated using cyclic voltammetry (CV), galvanostatic constant current charge‐discharge (CD) and the electrochemical impedance spectroscopy (EIS) techniques. SWCNT‐NiO nanocomposite modified electrodes gave better supercapacitive performance with a specific capacitance of 186 mF cm −2 (or 928 F g −1 ). This value compared quite favourably and even higher than values hitherto reported in several literature.