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- Title
Hierarchical FeCo<sub>2</sub>S<sub>4</sub>@FeNi<sub>2</sub>S<sub>4</sub> Core/Shell Nanostructures on Ni Foam for High‐Performance Supercapacitors.
- Authors
Huang, Yunxia; Ge, Shuaipeng; Chen, Xiaojuan; Xiang, Zhongcheng; Zhang, Xinran; Zhang, Ruoxuan; Cui, Yimin
- Abstract
The design of electrode materials with rational core/shell structures is promising for improving the electrochemical properties of supercapacitors. Hence, hierarchical FeCo2S4@FeNi2S4 core/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−1 at 1 A g−1 and long cycle lifespan as positive electrode materials. An asymmetric supercapacitor device with FeCo2S4@FeNi2S4 as positive electrode and graphene as negative electrode exhibited a specific capacitance of 133.2 F g−1 at 1 A g−1 and a high energy density of 47.37 W h kg−1 at 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@FeNi2S4 core/shell structures have great potential in the field of electrochemical energy storage.
- Subjects
SUPERCAPACITOR electrodes; SUPERCAPACITORS; NEGATIVE electrode; ENERGY density; ENERGY storage; NANOSTRUCTURES
- Publication
Chemistry - A European Journal, 2019, Vol 25, Issue 62, p14117
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201902868