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Issue 13, 2018
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Synthesis of three-dimensional mesoporous Cu–Al layered double hydroxide/g-C3N4 nanocomposites on Ni-foam for enhanced supercapacitors with excellent long-term cycling stability

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Abstract

In this study, a novel composite of Cu–Al layered double hydroxide (LDH) nanosheets and g-C3N4-covered Ni-foam was fabricated via a simple and facile two-step process. First, g-C3N4 sheets were deposited on Ni-foam by via electrodeposition method on a three-electrode system (Ni-foam@g-C3N4) and then, Cu–Al LDH nanosheets were grown on the Ni-foam via in situ redox reaction using a hydrothermal process (Ni-foam@Cu–Al LDH/g-C3N4). The FE-SEM image confirmed that the Cu–Al LDH nanosheets arose vertically and were anchored on the surface of electrodeposited g-C3N4 sheets, thus generating unique 3D porous interconnected networks. The electrochemical capacitive performances of the as-prepared samples were evaluated by cyclic volatammetry (CV), galvanostatic charge/discharge tests, and electrochemical impedance spectra (EIS) Nyquist plots. The specific capacitances of the Ni-foam@Cu–Al LDH/g-C3N4 nanocomposite measured from the CV curve (770.98 F g−1 at 50 mV s−1) and the galvanostatic charge/discharge curve (831.871 at 0.4 A g−1) were significantly higher than the others. Moreover, the Ni-foam@Cu–Al LDH/g-C3N4 nanocomposite revealed a remarkable high-current capacitive behavior and the capacitance retention could be maintained at 92.71% even after 5000 cycles of CV. Thus, the obtained results demonstrated that the as-prepared nanocomposite has great potential to be used as a novel supercapacitor electrode.

Graphical abstract: Synthesis of three-dimensional mesoporous Cu–Al layered double hydroxide/g-C3N4 nanocomposites on Ni-foam for enhanced supercapacitors with excellent long-term cycling stability

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Publication details

The article was received on 07 Nov 2017, accepted on 13 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C7DT04192F
Citation: Dalton Trans., 2018,47, 4455-4466
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    Synthesis of three-dimensional mesoporous Cu–Al layered double hydroxide/g-C3N4 nanocomposites on Ni-foam for enhanced supercapacitors with excellent long-term cycling stability

    S. P. Adhikari, G. P. Awasthi, K. Kim, C. H. Park and C. S. Kim, Dalton Trans., 2018, 47, 4455
    DOI: 10.1039/C7DT04192F

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