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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

Abstract

In this paper, a novel composite of Cu-Al layered double hydroxide (LDH) nanosheets and g-C3N4 covered Ni-foam was fabricated via simple and facile two-step processes. Firstly, g-C3N4 sheets were deposited on Ni-foam by using electrodeposition method on three electrode system (Ni-foam@g-C3N4) and then Cu-Al LDH nanosheets were grown on Ni-foam by in-situ redox reaction using hydrothermal process (Ni-foam@Cu-Al LDH/g-C3N4). The FE-SEM image confirmed the Cu-Al LDH nanosheets were rising vertically and anchored on the surface of electrodeposited g-C3N4 sheets making unique 3D porous interconnected networks. Electrochemical capacitive performances of the as-prepared samples were evaluated by cyclic volatammetry (CV), galvanostatic charge/discharge test and electrochemical impedance spectra (EIS) Nyquist plot. The specific capacitance of Ni-foam@Cu-Al LDH/g-C3N4 nanocomposite measured from CV curve (770.98 Fg-1 at 50 mVs-1) and galvanostatic charge/discharge curve (831.871 at 0.4 Ag-1) are significantly higher than others. Moreover, Ni-foam@Cu-Al LDH/g-C3N4 nanocomposite revealing remarkable high-current capacitive behavior and the capacitance retention could be kept 92.71% even after 5000 cycles of CV curves. Thus, the obtained results demonstrated that the as-prepared nanocomposite had great potential to be used as a novel supercapacitor electrode.

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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, Accepted Manuscript
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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. Awasthi, K. Kim, C. H. Park and C. S. Kim, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT04192F

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