Electrochemical Deposition of Multicomponent Mixed Metal Oxides on rGO/Ni Foam for All-Solid-State Asymmetric Supercapacitor Device: Mn, Co, and Ni Oxides with Ag Doping

Yunus Emre Firat and Viktor Čolić ()
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Yunus Emre Firat: Electrochemistry for Energy Conversion, Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
Viktor Čolić: Electrochemistry for Energy Conversion, Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany

Energies, 2022, vol. 15, issue 22, 1-15

Abstract: In this study, an asymmetric supercapacitor (ASSC) device is assembled by the deposition and annealing of silver-doped mixed metal oxides on reduced graphene oxide (rGO)/Ni foam and activated carbon (AC) on Ni foam as positive and negative electrodes, respectively. The best performing Ag:MnCoNiO active material is synthesized on rGO/Ni foam using chronopotentiometry combined with heat treatment. The XRD study clearly confirms the crystalline nature of the electrode with MnCo 2 O 4 and MnNi 2 O 4 phases. FT-IR and XPS studies revealed the formation of Ag:MnCoNiO/rGO on Ni foam. SEM images show a thin-film layer of fabricated material on the surface of rGO/Ni foam. The supercapacitor properties were tested in two- and three-electrode configurations, with cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) experiments in a 6 M KOH aqueous electrolyte. In the three-electrode configuration, reversible faradic reactions can be observed in a potential range of 0.0 and +0.6 V vs. Hg/HgSO 4 . In the two-electrode device configuration, the system exhibits a maximum energy density of 45.5 Wh kg −1 and provides a maximum power density of 4.5 kW kg −1 . The results showed that the doping of Ag in a MnCoNiO electrode shows promising properties, achieved by a very simple fabrication process. The results showcase the synergistic effects achieved by mixed multiple-component metal oxides, leading to improved supercapacitive properties.

Keywords: mixed metal oxide; supercapacitor; electrodeposition; specific capacitance; electrochemical impedance spectroscopy; cyclic voltammetry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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