Structural and electrochemical investigation of Fe-doped sheet-like ZnCo2O4 as battery-type electrode for high-performance hybrid supercapacitors

초록

Nanostructured multi-transition metal spinel oxides have emerged as promising candidates for enhancing the electrochemical performance of next-generation supercapacitors. In this work, the structural and electrochemical impacts of iron incorporation into ZnCo2O4 (ZCO) spinel structures were systematically explored by synthesizing pristine ZCO, 5% Fe-doped ZCO, and 10% Fe-doped ZCO. Detailed characterization confirmed that the sheet-like morphology of both undoped and Fe-doped ZCO effectively minimizes ion/electron transport resistance and provides abundant active sites for ion adsorption, thereby improving redox kinetics. Notably, Fe doping induced favorable structural and electronic modifications within the spinel lattice, leading to superior electrochemical behavior. All electrode showed with battery-type footprints and the 10% Fe-doped ZCO electrode and delivered an impressive specific capacity of 421.3 C g(-)& sup1; at 10 A g(-)& sup1; and maintained 85% of its initial capacity after 2000 charge-discharge cycles, demonstrating excellent cycling stability. Therefore, this study underscores the potential of Fe-doped ZnCo2O4 as a high-performance battery-type electrode material for advanced hybrid supercapacitor applications.

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