Microporous α‐Fe₂O₃@NiO Heterostructures Synthesized for Enhanced Supercapacitor Performance

In this present research, we synthesized pure α‐Fe 2 O 3 , NiO, and a microporous α‐Fe 2 O 3 @NiO heterostructure electrode via the spray pyrolysis method. The microporous α‐Fe 2 O 3 @NiO heterostructure electrode, with its highly porous structure, offers a larger electrode‐electrolyte interface, which results in improved electrochemical performance. Specifically, the microporous heterostructure exhibited a higher specific capacitance of 530.87 F/g at a current density of 7 mA/cm 2 in a 1 M NaOH electrolyte, as compared to α‐Fe 2 O 3 (187.12 F/g at 7 mA/cm 2 ) and NiO (492.69 F/g at 7 mA/cm 2 ). The microporous α‐Fe 2 O 3 @NiO heterostructures exhibited significantly enhanced electrochemical performance as compared to the individual α‐Fe 2 O 3 and NiO samples, owing to the synergistic effect of the heterostructure. Furthermore, the microporous α‐Fe 2 O 3 @NiO heterostructure exhibited high specific capacitances and exceptional cycling stability for more than 2000 cycles, indicating their potential as excellent electrode for supercapacitor devices.