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Fabrication of 3D binder-free graphene NiO electrode for highly stable supercapattery
Agudosi, Elochukwu Stephen (Universiti Teknologi Malaysia. Department of Chemical Process Engineering)
Abdullah, Ezzat Chan (Universiti Teknologi Malaysia. Department of Chemical Process Engineering)
Numan, Arshid (Fudan University. State Key Laboratory of ASIC and System)
Mubarak, Nabisab Mujawar (Curtin University. Department of Chemical Engineering)
Aid, Siti Rahmah (Universiti Teknologi Malaysia. Department of Electronic Systems Engineering)
Benages Vilau, Raúl (Institut Català de Nanociència i Nanotecnologia)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Khalid, Mohammad (Sunway University. School of Science and Technology)
Omar, Nurizan (Universiti Teknologi Malaysia. Department of Chemical Process Engineering)

Fecha: 2020
Resumen: Electrochemical stability of energy storage devices is one of their major concerns. Polymeric binders are generally used to enhance the stability of the electrode, but the electrochemical performance of the device is compromised due to the poor conductivity of the binders. Herein, 3D binder-free electrode based on nickel oxide deposited on graphene (G-NiO) was fabricated by a simple two-step method. First, graphene was deposited on nickel foam via atmospheric pressure chemical vapour deposition followed by electrodeposition of NiO. The structural and morphological analyses of the fabricated G-NiO electrode were conducted through Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS). XRD and Raman results confirmed the successful growth of high-quality graphene on nickel foam. FESEM images revealed the sheet and urchin-like morphology of the graphene and NiO, respectively. The electrochemical performance of the fabricated electrode was evaluated through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in aqueous solution at room temperature. The G-NiO binder-free electrode exhibited a specific capacity of ≈ 243 C g at 3 mV s in a three-electrode cell. A two-electrode configuration of G-NiO//activated charcoal was fabricated to form a hybrid device (supercapattery) that operated in a stable potential window of 1. 4 V. The energy density and power density of the asymmetric device measured at a current density of 0. 2 A g were estimated to be 47. 3 W h kg and 140 W kg, respectively. Additionally, the fabricated supercapattery showed high cyclic stability with 98. 7% retention of specific capacity after 5,000 cycles. Thus, the proposed fabrication technique is highly suitable for large scale production of highly stable and binder-free electrodes for electrochemical energy storage devices.
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Lengua: Anglès
Documento: Article ; recerca ; Versió publicada
Materia: Environmental social sciences ; Materials science ; Nanoscience and technology
Publicado en: Scientific reports, Vol. 10 (2020) , art. 11214, ISSN 2045-2322

DOI: 10.1038/s41598-020-68067-2
PMID: 32641769


13 p, 4.2 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
Artículos > Artículos de investigación
Artículos > Artículos publicados

 Registro creado el 2021-01-25, última modificación el 2023-10-01



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