Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 749, Issue -, Pages 900-908Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.03.353
Keywords
NiCo2O4@MnO2 NNAs; Cross-linked; EDLC contribution; Supercapacitors
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Funding
- Natural Science Foundation of China [51674221, 51704261]
- China Postdoctoral Science Foundation [2016M591405]
- Youth Scholars Research Fund of Yanshan University [16GA012]
- Science and Technology Research and Development Program of Qinhuangdao [201602A004]
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A highly cross-linked three-dimensional (3D) hierarchical porous NiCo2O4 nanosheet@MnO2 nanosheet arrays (NNAs) on Ni foam is fabricated by a facile and stepwise hydrothermal approach. The NiCo2O4@MnO2 hybrid electrode demonstrates excellent electrochemical properties with high area capacitance of 5.3 F cm(-2) at 1 mA cm(-2), tremendous rate performance (68.9% with current density increased to 20 mA cm(-2)), and outstanding cycling stability (90.1% capacitance retention over 5000 cycles at 20 mA cm(-2)). The intriguing performance is related to unique cross-linked porous heterostructure with open geometry that provides large surface areas and superb channels for the electrolyte penetration and ion diffusion. Besides, by analyzing non-faradaic capacitive current upon repeated potential cycling, this honor attributes to not only sufficient Faraday reactions, but also a worthy electrochemical double-layer capacitance (EDLC) contribution with an electrochemical surface area (ESA) value of 616 mF cm(-2) (220 F g(-1) with a mass loading of 2.8 mg cm(-2)), which approximates to that of porous carbon. (C) 2018 Elsevier B.V. All rights reserved.
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