High entropy spinel metal oxide (CoCrFeMnNi)3O4 nanoparticles with PEDOT:PSS as a high-performance supercapacitor electrode material

This research presents the initial application of the reverse co-precipitation method for the preparation of supercapacitor electrode materials derived from nanoparticles of the first spinel (CrMnFeCoNi)3O4 high-entropy oxide (HEO). The analysis through X-ray diffraction validated the presence of a phase-pure spinel structure. Additionally, the electrochemical energy storage characteristics were further investigated on the spinel HEO-based supercapacitor electrode material. The HEO electrode demonstrated a capacitance of 365 F g−1 and a specific energy of 24.1 Wh kg−1 at a current density of 0.5 A g−1. A rate capability of 38% was recorded when the current density increased from 0.5 to 25 A g−1. Furthermore, the capacitance retention was recorded at 76% after 1000 cycles. The coulombic efficiency remained at 86% over the same number of cycles, suggesting that HEO exhibits favorable charge-discharge reversibility. The solution resistance (Rs) and charge transfer resistance (Rct) of HEO electrodes have been determined to be 3.3 Ω and 1.56 Ω, respectively.

High entropy spinel metal oxide (CoCrFeMnNi)3O4 nanoparticles with PEDOT:PSS as a high-performance supercapacitor electrode material Keywords:

Supercapacitors , High entropy oxide , Spinel