Facile synthesis of CaCo₂O₄/Co₃O₄ hexagonal nanostructure for high performance quasi-solid-state asymmetric supercapacitor

In the present report, CaCo₂O₄/Co₃O₄ hexagonal nanostructure is prepared by facile and most adopted co-precipitation process followed by heating at 600 °C for 5 h. CaCo₂O₄/Co₃O₄ nanocomposite is used for supercapacitor and specific capacity of 70.28 mAh g⁻¹ is obtained at 1 A g⁻¹ using graphite sheet as a current collector. The cyclic performance of CaCo₂O₄/Co₃O₄ is investigated at 1 A g⁻¹ and, retention of 92.5 % is obtained after 6000 cycles. Further, quasi-solid-state asymmetric supercapacitor (QSSAC) is designed by CaCo₂O₄/Co₃O₄ (positive electrode) and activated carbon (negative electrode) which delivers the high energy density of 107.45 W h kg⁻¹ at the power density of 1.0 kW kg⁻¹. Further, parallel connected two light-emitting diodes and kitchen timer are operated separately by single CaCo₂O₄/Co₃O₄//AC supercapacitor.