FeCo2S4/RGO/Ag diamond-like nanostructured electrode material for highly efficient symmetric supercapacitor

A simple hydrothermal approach was used to directly decorate FeCo2S4/RGO/Ag diamond-like nanostructured electrode on NF. RGO/Ag was produced via a chemical reduction method, followed by one sulfidation method to produce FeCo2S4 on the top of RGO/Ag. The produced electrode demonstrated exceptional electrochemical performance, with a specific capacitance of 1840 F g−1 at 2 A g−1 in 6 M KOH solution. The electrode has an excellent retention rate, it retains 93.3 % of its primary capacitance after 5000 cycles, while coulomb efficiency reaches 99.2 %. At 1 A g−1, the symmetric device FeCo2S4/RGO/Ag/NF has a captivating specific capacitance of 217 F g−1 and a specific energy of 59 Wh kg−1 at a specific power of 817 W kg−1. After 10,000 charging and discharging cycles, the device retains 94 % of its capacitance, demonstrating its exceptional cycling stability and near-perfect coulomb efficiency of ∼100 %. The remarkable electrochemical behavior of FeCo2S4/RGO/Ag was due to the synergistic effect between FeCo2S4 and RGO/Ag which makes it a potential candidate material for highly efficient SC.