One-step electrodeposited cracked-bark-shaped NiCoMoS on carbon cloth for high-performing aqueous asymmetric supercapacitors

Abstract

The present study focuses on the development of a high-performing flexible electrode with a cracked-bark-shaped nanostructure of NiCoMoS (NCMS) on carbon cloth through one-step electrodeposition. The electrode demonstrates an impressive capacitance of 10,860.0 mF cm−2 at 1 mA cm−2 and superior rate performance, maintaining a capacitance of 4212.0 mF cm−2 even at 60 mA cm−2. Cycling test reveals that the electrode retains 86.2 % of its original capacitance and nearly 100 % Coulombic efficiency after 6000 cycles at 30 mA cm−2, attributed to the effective stress release facilitated by the cracked-bark-shaped structure. An aqueous asymmetric supercapacitor, comprising of NCMS cathode, activated carbon anode and 2 M KOH electrolyte, demonstrates an energy density of 0.600 mWh cm−2 at 0.800 mW cm−2 while exhibiting superior cycling stability (82.9 % after 15,000 cycles) at 30 mA cm−2.