Hierarchical FeCo2S4@FeNi2S4 Core/Shell Nanostructures on Ni Foam for High-Performance Supercapacitors
Hierarchical FeCo2S4@FeNi2S4 Core/Shell Nanostructures on Ni Foam for High-Performance Supercapacitors
复制标题
用于高性能超级电容器的泡沫镍上的分层 FeCo2S4@FeNi2S4 核/壳纳米结构
DOI：
10.1002/chem.201902868
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Cui Yimin
中科院分区：
文献类型：
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作者：
Huang Yunxia;Ge Shuaipeng;Chen Xiaojuan;Xiang Zhongcheng;Zhang Xinran;Zhang Ruoxuan;Cui Yimin
设计具有合理核/壳结构的电极材料是提高超级电容器电化学性能的重要途径。因此，采用简单的水热法在泡沫镍上制备了FeCo2S4@FeNi2S4核/壳结构.由于它们的结构和协同效应，它们作为正极材料具有优异的比电容（1 A g− 1时为2393 F g− 1）和较长的循环寿命。 具有FeCo2S4@FeNi2S4作为正极和石墨烯作为负极的非对称超级电容器装置在1 A g-1下表现出133.2 F g-1的比电容，并且在800 W kg-1的功率密度下表现出47.37 W h kg-1的高能量密度。 此外，该器件显示出显著的循环稳定性，在2 A g−1下5000次循环后，比电容保持率为87.0%。 这些结果表明，FeCo2S4@FeNi2S4核壳结构在电化学储能领域具有巨大的潜力。
The design of electrode materials with rational core/shell structures is promising for improving the electrochemical properties of supercapacitors. Hence, hierarchical FeCo2S4@FeNi2S4core/shell nanostructures on Ni foam were fabricated by a simple hydrothermal method. Owing to their structure and synergistic effect, they deliver an excellent specific capacitance of 2393 F g−1at 1 A g−1and long cycle lifespan as positive electrode materials. An asymmetric supercapacitor device with FeCo2S4@FeNi2S4as positive electrode and graphene as negative electrode exhibited a specific capacitance of 133.2 F g−1at 1 A g−1and a high energy density of 47.37 W h kg−1at a power density of 800 W kg−1. Moreover, the device showed remarkable cycling stability with 87.0 % specific‐capacitance retention after 5000 cycles at 2 A g−1. These results demonstrate that the hierarchical FeCo2S4@FeNi2S4core/shell structures have great potential in the field of electrochemical energy storage.