Nanostructured Co doped Mn3O4 spinel structure ((Co, Mn)3O4) were prepared by co-precipitation under O3 oxidizing conditions and post-heat treatment. The product was composed of nanogranules with a diameter of 20-60 nm. The electrochemical performance of (Co, Mn)3O4 electrode was tested by cyclic voltammetry, impedance, and galvanostatic charge-discharge measurements. A maximum specific capacit...

Magnetic metal (Mn, Fe, Co, and Ni) oxides nanocrystals with small size and uniform size distribution are synthesized via a cation-exchange reaction. Two experimental stages are included in the synthesis of metal oxides nanocrystals. Firstly, Cu(OH)2 decomposes to CuO nanocrystals, induced by free metal cations. Compared to CuO nanocrystals produced without any free metal cation, the free metal...

Porous electrodes are fast emerging as essential components for next-generation supercapacitors. Using porous structures of Co3O4, Mn3O4, α-Fe2O3, and carbon, their advantages over the solid counterpart is unequivocally established. The improved performance in architecture linked to enhanced active specific surface direct channels leading electrolyte interaction with redox-active sites. A theor...