Highly flexible hybrid devices enabled by Ag-decorated ZnCo2O4 electrodes

Abstract

Electrode materials with excellent performance are the basis for designing supercapacitors with outstanding stability and high specific capacitance. In this work, we prepared a type of ZnCo₂O₄ nanosheet structure with Ag nanoparticles through a multi-step hydrothermal strategy. The as-fabricated composite presented a specific capacity of 2540 F g⁻¹ at 1 A g⁻¹ due to the synergetic effect of its components and structure. The three-dimensional structure enabled the material to maintain an initial specific capacitance of 92.5% after 10 000 cycles. The asymmetric supercapacitor delivered an energy density of 72.36 W h kg⁻¹ at a power density of 10 800 W kg⁻¹. Moreover, it demonstrated 89% capacitance retention at 5 A g⁻¹ after 10 000 cycles even when the operating temperature decreased to 0 °C.