MnCoP-Coated NiCo2S4 Nanostructures on Ni Foam for Aqueous Asymmetric Supercapacitors.

This study presents a promising composite cathode prepared by electrodepositing MnCoP nanostructures on hydrothermally grown NiCo₂S₄ on Ni foam. The cathode has a capacitance of up to 7780.0 mF cm^–2 at 1 mA cm^–2, good rate performance (6340.0 and 4464.0 mF cm^–2 at 10 and 60 mA cm^–2), as well as cycling stability with 81.8% maintenance of its original capacitance after 7000 cycles at 20 mA cm^–2. The energy density achieved by the supercapacitor, which consists of this cathode, an activated carbon anode (on carbon cloth), and 2 M KOH aqueous solution electrolyte, is 0.488 mWh cm^–2 at 0.800 mW cm^–2. Furthermore, it exhibits good cycling stability as it retains 84.8% of its initial capacitance even after 20 000 cycles at 20 mA cm^–2. [ABSTRACT FROM AUTHOR]