Effective electrode material for enhancing asymmetric supercapacitors: novel synthesis of organized FeS/SnO2 nanostructure

SnO ₂ and FeS have gained a lot of attention due to their successful electrochemical developments as supercapacitor electrode materials. However, below-average cyclic stability and conductivity limit SnO ₂ advantages. FeS is a good choice for composite electrodes because it simultaneously demonstrates impressive theoretical capacity and durable electrical conductivity. For the electrode material in the supercapacitor, FeS/SnO ₂ composites in ratio of (1:1) is created through wet chemical along with hydrothermal process. With specific capacitance of 425 Fg ⁻¹ and 113 Fg ^-1 in three electrode and two electrode set-ups, the composite exhibits a remarkable performance that surpasses that of FeS, and SnO ₂ electrodes. At current density of 5 Ag⁻¹, electrode also shows an 92 % capacitance retention over 7000 consecutive charge-discharge cycles. The improved specific capacitance of the composite electrode is assigned to synergistic interaction between Fe ⁺² and Sn ^-4, as well as nanoparticles-like morphology of SnO ₂ , which provides a porous surface area for FeS nanoplates, enhancing the conductivity process and utilizing the composite electrode in highly effective electrochemical capacitors. More sulfide-based transition metal oxides with improved electrochemical characteristics for energy transformation and preservation can be produced using this economical and efficient synthetic process.