Ion-by-Ion Adsorption
Process and Reaction for the
Synthesis of Hierarchical Manganese Tungstate (MnWO4) Microflowers
as an Energy-Efficient Electrode for Supercapacitors
posted on 2024-03-08, 16:03authored byUmesh
V. Shembade, Rhishikesh A. Moholkar, Namira H. Ambi, Kalyani S. Nikam, Sandeep B. Wategaonkar, Navnath S. Padalkar, Jong Pil Park, Annasaheb V. Moholkar
For the first time, manganese tungstate (MnWO4) electrodes
are successfully synthesized by the successive ionic layer adsorption
and reaction (SILAR) method. This study is mainly focused on synthesized
hierarchical MnWO4 microflowers (MFs) for electrochemical
supercapacitor application. The crystalline structure, morphology,
presence of functional groups, stretching and bending vibration, and
availability of chemical states present in the MnWO4 MFs
are investigated using X-ray diffraction (XRD), scanning electron
microscopy (SEM), Fourier transform infrared, Raman, and X-ray photoelectron
spectroscopy, respectively. In addition, the resultant materials undergo
electrochemical analysis using a three-electrode system. As a result,
the MnW-50 electrode reveals a maximum specific capacitance (Cs) and
capacity (Csp) of 698 F/g and 87 mAh/g at 5 mA/cm2 with
moderate energy density (ED) and power density (PD) of 19 Wh/kg and
700 W/kg, respectively. Furthermore, the aqueous hybrid device is
fabricated using MnWO4 MFs as a cathode and reduced graphene
oxide (rGO) as an anode material, which reveals the maximum performance
of the Cs and Csp of 206 F/g and 87 mAh/g at 5 mV/s and 185 F/g and
70 mAh/g with sufficient ED, and PD of 45 Wh/kg and 1960 W/kg at 5
mA/cm2, respectively. The aforementioned results indicate
the benefits and improved electrochemical efficiency of MnWO4 MFs as cathodes for hybrid supercapacitors.