Hierarchical three-dimensional FeCo2O4@MnO2 core-shell nanosheet arrays on nickel foam for high-performance supercapacitor. (20th February 2017)

• Record Type: Journal Article
• Authors: Lin, Liyang; Tang, Shan; Zhao, Shuoqing; Peng, Xianghe; Hu, Ning
• Is Part Of: Electrochimica acta. Volume 228(2017)
• Page Start: 175
• Page End: 182
• Publication Date: 2017-02-20
• Subjects: Binder-free -- FeCo2O4@MnO2 -- Core-shell nanosheet arrays -- Supercapacitors; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.01.022
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: First report hierarchical 3D FeCo2O4@MnO2 core-shell nanosheet arrays on Ni foam. The Ni@FeCo2O4@MnO2 electrode possesses excellent electrochemical performance. High specific capacity is attributed to the synergistic effect of FeCo2O4@MnO2 system. 3D Ni@FeCo2O4@MnO2 SC devices exhibit good cycling stability even after long cycle. Abstract: Developing supercapacitors with high energy density, good rate capability, and superior cycle life is crucial to the ever-increasing energy storage devices. However, how to design and develop a new type of faradaic electrode material with large surface area, low resistance, and stable microstructures is still a challenge work. Herein, we have successfully realized a high-energy and long-life supercapacitor by developing nickel foam—hierarchical three-dimensional iron cobaltate nanosheet arrays framework, and covering the surface with thin nanosheets of manganese dioxide (Ni@FeCo2 O4 @MnO2 ). The free-standing supercapacitor device based on this structure gives rise to a high energy density of 22.2 Whkg −1 at a power density of 978.3 Wkg −1, and ∼87.2% of the capacitance can be retained after 5000 cycles of charge-discharge. These performance features are excellent among those reported for iron cobaltate based supercapacitors, making it a promising candidate for high-performance electrochemical energy storage.