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Ni-P@NiCo LDH Core-Shell Nanorods Decorated Nickel Foam with Enhanced Areal Specific Capacitance for High-Performance Supercapacitors

Abstract

Recently, transition metal-based nanomaterials have played a key role in the applications of supercapacitors. In this work, nickel phosphide (Ni-P) was simply combined with NiCo LDH via facile phosphorization of Ni foam and subsequent electrodeposition to form core-shell nanorod arrays on Ni foam and then directly used for pseudocapacitive electrode. Owing to the splendid synergistic effect between Ni-P and NiCo LDH nanosheets as well as the hierarchical structure of 1D nanorods, 2D nanosheets and 3D Ni foam, the hybrid electrode exhibited significantly enhanced electrochemical performances. The Ni-P@NiCo LDH electrode showed a high specific capacitance of 12.9 F cm-2 at 5 mA cm-2 (3470.5 F g-1 at the current densities of 1.3 A g-1), remained as high as 6.4 F cm-2 at a high current density of 100 mA cm-2 (1700 F g-1 at 27 A g-1), and excellent cycling stability (96% capacity retention after 10000 cycles at 40 mA cm-2). Furthermore, the asymmetric supercapacitors (ASCs) were assembled using Ni-P@NiCo LDH as positive electrode and activated carbon (AC) as negative electrode, respectively. The obtained ASCs delivered a remarkable energy density and power density as well as good cycling performance. The enhanced electrochemical activities open a new avenue for the development of supercapacitors.

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Publication details

The article was received on 25 May 2017, accepted on 04 Jul 2017 and first published on 06 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT01910F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Ni-P@NiCo LDH Core-Shell Nanorods Decorated Nickel Foam with Enhanced Areal Specific Capacitance for High-Performance Supercapacitors

    J. Xing, J. Du, X. Zhang, Y. Shao, T. Zhang and C. xu, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT01910F

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