Enhanced Faradaic Pseudo-capacitance in reduced π-conjugated carbon network anchored with Strontium Tungstate Nano-Hybrids for High-Energy Supercapacitors

Abstract

The development of high-performance electrode materials with superior energy-storage characteristics is critical to enabling next-generation supercapacitor technologies. In this report, we describe the synthesis of SrWO₄/rGO hybrid nanostructures in which the ternary metal oxide SrWO₄ provides enhanced electrical conductivity and redox activity, while reduced graphene oxide (rGO) contributes a high surface area, resulting in synergistically improved electrochemical characteristics. This hybrid electrode material displays excellent electrochemical execution, delivering an excellent specific capacitance of 727 F g^(-1) at 1 A g^(-1) and asserted 95% of its capacitance over 5000 cycles, indicating extended stability. The asserted symmetric cell operates over a wide potential window of 1.6 V in a 1 M KOH electrolyte. Demonstrating exceptional electrochemical performance and rate capability. Electrochemical impedance spectroscopy (EIS) reveals low charge-transfer resistance and a Warburg impedance, indicating ion diffusion. The Ragone plot highlights an impressive energy density of 94.5 Wh kg^(-1) at a power density of 2678.7 W kg^(-1), retaining 96.2 % of its capacitance over 5000 continuous charge–discharge cycles. This exceptional performance is attributed to the synergistic effect of conductive SrWO4 and the higher surface area, stemming from its resorted 𝜋-conjugated rGO structure, enabling efficient charge transport and abundant electroactive sites. This work delivers a promising pathway for designing advanced electrode materials for high-performance energy storage systems.