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Hierarchical Core-Shell Structures of P-Ni(OH)2 Rods@MnO2 Nanosheets as High Performance Cathode Material for Asymmetric Supercapacitors

Abstract

The hierarchical porous structure with phosphorus doped Ni(OH)2 (P-Ni(OH)2) rods as core and MnO2 nanosheets as shell is fabricated directly grown on three-dimensional (3D) flexible Ni foam (NF) via two-step hydrothermal process. As a binder-free eletrode material, this unique hybrid structure exhibits excellent electrochemical properties including an ultrahigh areal capacitance of 5.75 F cm-2 at a current density of 2 mA cm-2, great cyclic stability without capacitance loss at a current density of 20 mA cm-2 after 10000 cycles. Moreover, an all-solid-state asymmetric supercapacitor (AAS) based on P-Ni(OH)2@MnO2 hybrid structure on Ni foam as cathode and activated carbon (AC) as anode is successfully assembled to further value the electrochemical properties. The AAS device also shows excellent electrochemical properties including a large potential window of 01.6 V, an areal capacitance is 911.3 mF cm-2 at a current density of 1 mA cm-2 and long-term cycling performance. Meanwhile, the AAS device also delivers a high energy density of 0.324 mWh cm-2 at the power density of 0.8 mW cm-2; and can easily light colorful LED lights, suggesting that 3D P-Ni(OH)2@MnO2 hybrid composite has promising potential for practical use in high-performance supercapacitor.

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Publication details

The article was received on 08 Sep 2017, accepted on 03 Jan 2018 and first published on 03 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR06712G
Citation: Nanoscale, 2018, Accepted Manuscript
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    Hierarchical Core-Shell Structures of P-Ni(OH)2 Rods@MnO2 Nanosheets as High Performance Cathode Material for Asymmetric Supercapacitors

    K. Li, S. Li, F. Huang, X. Yu, Y. Lu, L. Wang, H. Chen and H. Zhang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR06712G

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