超级电容器
电容
化学
异质结
电极
复合数
电流密度
功率密度
材料科学
电容器
化学工程
电化学
光电子学
复合材料
电压
电气工程
物理化学
功率(物理)
物理
量子力学
工程类
作者
W.D. Wang,X.F. Li,P.P. Zhang,Bo Wang,Shilei Gong,Xinchang Wang,F. Liu,J.P. Cheng
标识
DOI:10.1016/j.jelechem.2021.115257
摘要
Abstract It is a preferred method by constructing core − shell structured composites with heterojunctions to enhance the charge transfer and improve electrochemical performances for supercapacitors. In this work, we prepare NiCo2O4@CoS electrode materials on nickel foam via coating n − type CoS on p − type NiCo2O4 to form heterojunctions. The composite shows a synergistic effect from each component and has abundant active sites, as well as outstanding reaction kinetics. Density functional theory (DFT) analysis reveals that the NiCo2O4@CoS composite exhibits higher electronic conductivity than any single component. The NiCo2O4@CoS electrode presents an outstanding capacitance of 1902.5F g−1 at the current density of 1 A g−1. A hybrid capacitor with NiCo2O4@CoS as the positive electrode and activated carbon as the negative electrode shows a high energy density of 32.91 Wh kg−1 at the power density of 425 W kg−1 and an excellent stability of 81.5% initial capacitance after 5000 cycles at 1 A g−1. The conclusions indicate that the heterojunction of NiCo2O4@CoS can be a potential electrode for supercapacitors.
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