Oxygen defect-mediated NiCo₂O₄ nanosheets as the electrode for pseudocapacitors with improved rate capability

Abstract

Transition metal oxide-based supercapacitors have attracted much attention due to the high theoretical specific capacitances. However, due to insufficient utilization ratio and poor intrinsic conductivity of active materials, the rate...

Stable Supercapacitors Based on Activated Carbon Prepared from Italian Orange Juice

“…and Power density = Energy density t d (5) where V 0 is the maximum voltage to charge the supercapacitor, Q is the net charge accumulated by the device, i is the constant current applied during the charge/discharge process, and t c is the charging period. Equation ( 4) is normalized with an appropriate parameter and a factor of 3600 yields, resulting in watt-hour units.…”

“…In the area of energy storage, supercapacitors have emerged as formidable candidates, supported by their distinct power density, rapid charge-discharge profiles, and sustained cycle durability [ 1 , 2 , 3 ]. These electrochemical storage systems predominantly segregate into two categories: electric double-layer capacitors (EDLCs) and pseudocapacitors [ 4 , 5 ]. The operational mechanism of EDLCs is anchored in the reversible adsorption of ions at the electrode-electrolyte interface, primarily facilitated by electrostatic forces, marking a non-faradaic process [ 6 ].…”