Leaf-Like CuCo2O4@CuCo2O4 Core-Shell Nanowires as Binder-Free Electrode for High-Performance Flexible Supercapacitors

摘要

A reasonable electrode structure is important to improve the performance of supercapacitors.In this work,Leaf-like CuCo2O4@CuCo2O4 nanowires grown erectly on Ni foam substrate were prepared by two-step hydrothermal method to form a mutually perpendicular core-shell nanostructure.The binder-free CuCo2O4@CuCo2O4 nanowires were more likely to benefit from multidimensional synergistic effect and better conductivity,revealing a high specific capacitance of 5.86 Fcm~(-2)at 5 mAcm~(-2)and good cycle stability(90.2% after 8000 cycles).In addition,the SC based on CuCo2O4@CuCo2O4 battery-type electrodes exhibited good flexible properties.The environment friendly and low cost CuCo2O4@CuCo2O4//AC flexible SCs perform a high energy density of 0.35 mWhcm~(-2)at a power density of 8 mWcm~(-2).The results indicated that CuCo2O4@CuCo2O4 core-shell materials have high application value,thus providing a new type of advanced electrode for flexible SCs.