Advancement in Nickel Ferrite–Based Composites for Enhanced Supercapacitor Performance

In recent years, there has been significant attention on supercapacitors as high-performance energy storage devices. Among various ternary transition metal oxides (TMOs), nickel ferrite (NiFe 2 O 4 ) has emerged as a promising candidate for supercapacitor electrodes due to its affordability, non-toxicity, high theoretical specific capacitance, and favorable redox activity. This review focuses on recent advances in NiFe 2 O 4 for supercapacitor applications, specifically examining how different composites such as NiFe 2 O 4 /carbon composites, NiFe 2 O 4 /conductive polymers, NiFe 2 O 4 /metal oxides, and NiFe 2 O 4 /ternary nanocomposites influence electrochemical performance. Each section discusses how these composites synergistically enhance the conductivity, specific capacitance, and cycling stability of NiFe 2 O 4 . Notably, carbon-based NiFe 2 O 4 composites exhibit excellent electrochemical performance due to the high electrical conductivity, large surface area, and electric double-layer behaviour of carbon. Similarly, the combination of NiFe 2 O 4 with conductive polymers improves overall capacitance and rate capability through the addition of redox-active sites and improved mechanical stability. Therefore, the findings demonstrate the potential of nickel ferrite as a promising material for ultrafast supercapacitors in contemporary renewable energy storage systems, thereby enabling environmentally benign energy storage.