Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors

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Authors

Mirghni, Abdulmajid Abdallah
Momodu, Damilola Y.
Oyedotun, Kabir Oyeniran
Dangbegnon, Julien K.
Manyala, Ncholu I.

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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.

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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.