非阻塞I/O
超级电容器
材料科学
电极
煅烧
化学工程
镍
氧化镍
电解质
阴极
电化学
电流密度
复合数
纳米技术
复合材料
化学
冶金
催化作用
有机化学
物理化学
工程类
物理
量子力学
作者
Xiaoqian Wang,Wangting Luo,Yaqi wang,Fanbin Meng,Y. Zhang
标识
DOI:10.1016/j.electacta.2023.143279
摘要
In this study, hydrothermal synthesis and calcination strategies were used to grow MgCo2O4@NiO composites on nickel foam. NiO nanosheets were loaded onto rod-shaped MgCo2O4 to form a 3D MgCo2O4@NiO structure, which can intimate electrode/electrolyte contact and accelerate electron transport during a Faradic reaction. The MgCo2O4@NiO electrode exhibits superior high-rate electrochemical performance, which provides optimal capacities for the preparation. The cathode material exhibited a maximum capacity of 900.0 C g−1 at a current density of 1 A g−1. The composite material showed good long-cycle stability, retaining 96.3% of capacities after 3000 cycles. The assembled supercapacitor achieved an energy density of 39.5 Wh kg−1 at a power density of 850.0 W kg−1. This study suggests that MgCo2O4@NiO is an encouraging candidate for the next-generation energy storage devices.
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