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

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...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2018, Vol.47 (13), p.4455-4466
Main Authors: Surya Prasad Adhikari, Ganesh Prasad Awasthi, Kyung-Suk, Kim, Park, Chan Hee, Kim, Cheol Sang
Format: Article
Language:English
Subjects:
Aluminum
Carbon nitride
Copper
Discharge
Electrodes
Hydroxides
Nanocomposites
Nanostructure
Nickel
Nyquist plots
Sheets
Supercapacitors
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Summary: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.
ISSN:1477-9226
1477-9234
DOI:10.1039/c7dt04192f