Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors
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Date
Authors
Mirghni, Abdulmajid Abdallah
Momodu, Damilola Y.
Oyedotun, Kabir Oyeniran
Dangbegnon, Julien K.
Manyala, Ncholu I.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
In this paper, we explore the successful hydrothermal approach to make Co3(PO4)2·4H2O/GF micro-flakes composite material. The unique sheet-like structure of the graphene foam (GF) significantly improved the conductivity of the pristine Co-based material, which is a key limitation in supercapacitors application. The composite electrode material exhibited superior capacitive conduct in 6 M KOH aqueous electrolyte in a 3-electrode set-up as compared to the pristine cobalt phosphate material. The material was subsequently adopted as a cathode in an asymmetric cell configuration with carbonization of Fe cations adsorbed onto polyaniline (PANI) (C-Fe/PANI), as the anode. The Co3(PO4)2·4H2O/GF//C-FP hybrid device showed outstanding long life cycling stability of approximately 99% without degradation up to 10000 cycles. A specific energy density as high as 24 W h kg−1, with a corresponding power density of 468 W kg−1 was achieved for the device. The results demonstrated the efficient utilization of the faradic-type Co3(PO4)2·4H2O/GF composite along with a functionalized carbonaceous electric double layer (EDL)-type material to produce a hybrid device with promising features suitable for energy storage applications.
Description
Keywords
Graphene foam (GF), Electric double layer (EDL), Cobalt phosphate, Iron-carbonized polyaniline, Hybrid capacitors, Energy storage, Foams, Specific energy density, Sheet-like structure, Electrochemical analysis, Composite electrode, Asymmetric capacitors, Supercapacitor, Potassium hydroxide, Positive ions, Polyaniline, Graphene, Electrolytes, Electrochemistry, Electrochemical electrodes, Cobalt deposits, Cobalt compounds, Cathodes, Carbonization, Anodes
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Citation
Mirghni, A.A., Momodu, D., Oyedotun, K.O. et al. 2018, 'Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors', Electrochimica Acta, vol. 283, pp. 374-384.