Neda Kalantari

In this study, sol-gel combustion was used to create Mn-doped Ag@SrCoO3 (Ag@SCM-x, x = 0.0, 0.2, 0.5, 0.8) perovskite composites, which have been then assessed as potential electrode materials for supercapacitor applications. Comprehensive structural, morphological, and electrochemical investigations showed that the concentration of oxygen vacancies and the oxidation states of the transition metals were significantly affected by the addition of Mn to the B-site of the perovskite lattice. The kinetics of ion transport and redox activity were enhanced by these structural modifications. Ag@SCM-0.8 outperformed the other produced samples in terms of electrochemical performance, exhibiting a specific capacitance of 950.18 F·g−1 at a current density of 2.0 A·g−1. The combined effects of Mn doping, which improves Co oxidation states and promotes oxygen ion mobility through enriched vacancy channels, are responsible for the enhanced performance. Moreover, the Ag@SCM-0.8 electrode exhibited a high stability and could maintain approximately 92.5% of its initial capacitance after 5000 charge-discharge cycles, which implies that the electrode is quite reliable and can be utilized in the next-generation advanced supercapacitors.