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 NiCo
2
O
4
(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.