Outstanding Electrochemical Supercapacitor Performances of NiCo2O4 Nanoflowers

Abstract

Cost-efficient and dynamic electrode materials are required for high-performance renewable energy storage devices. A cost-effective and simple hydrothermal method was employed to prepare NiCo2O4(NCO) nanoflowers (NFs) as an electrode material for high-energy storage electrochemical supercapacitors. The as-prepared nanoflowers were characterized by XRD, BET, SEM, and TEM. NCO-NFs were first coated on nickel foam and then used as a binder-free electrode in a supercapacitor device. The fabricated asymmetric supercapacitor device showed excellent electrochemical properties. The highly conductive NCO-NFs material not only shows a high specific capacitance of 410F g−1 at a scan rate of 5 mV s−1 but also exhibits good cycling stability of 91% capacitive retention after 5000 cycles. The device also delivers a high energy density of 30 Wh kg−1 at a power density of 165 W kg−1. Our method provides a simple and promising strategy for high-performance supercapacitor electrode application.