Nanosheet floral clusters of Fe-doped Co₃O₄ for high-performance supercapacitors

Because of their superior power and energy densities, supercapacitors have garnered considerable amounts of attention in energy storage technologies. Co3O4 is considered as a regularly used electrode material for supercapacitors because of its high theoretical capacitance and outstanding electrochemical activity. However, owing to the Co3O4 electrode materials' rapid capacity decay and low intrinsic conductivity, it is challenging to achieve high theoretical capacitance. As a result, doping Co3O4 with metal components can enhance its electrical and surface characteristics while also raising its conductivity. Through a straightforward hydrothermal reaction and subsequent thermal decomposition, a series of Fe doping into Co3O4 has been successfully realized in this paper. This generates a nanosheet floral cluster structure and exposes more active sites, and the two metal elements work in concert to improve the capacitance performance. The electrochemical performance of the Co-0.2Fe-450 electrode material appears satisfactory when the doping amount of Fe is 0.2 mmol and its thermal decomposition temperature is 450 degrees C. The specific capacitance at 1 A g(-1) is 680 F g(-1). The capacitance retention rate at 10 A g(-1) current density after 5000 charge-discharge cycles is 84.67%. Notably, the assembled asymmetric supercapacitor retains 105.5% of its capacitance after 5000 cycles and has a power density of 803.13 W kg(-1) and an energy density of 17.78 W h kg(-1). Fe-doped Co3O4 has a strong future in energy storage, as evidenced by its exceptional electrochemical characteristics.