A chromium cobaltite based ternary composite as an efficient electrode material for hybrid supercapacitors with theoretical investigation

• Published in: Nanoscale 2024-11, Vol.16 (46), p.21456-2147
• Main Authors: Kour, Simran, Kour, Pawanpreet, Sharma, A. L
• Format: Article
• Language: English
• Subjects: Activated carbon; Charge transfer; Chromium; Cycles; Electrochemical analysis; Electrode materials; Electrodes; Electronic properties; Manganese dioxide; Polypyrroles; Supercapacitors; Surface stability
• ISSN: 2040-3364; 2040-3372; 2040-3372
• DOI: 10.1039/d4nr02982h

To cater to the growing demand for advanced energy storage devices, the development of efficient electrode materials with brilliant electrochemical response is highly required. Battery-like materials have gained wide research attention as effective electrode materials for hybrid supercapacitors (HSCs). In this account, chromium cobaltite (CrCo 2 O 4 ) has been synthesized via a facile hydrothermal route. The structural and electronic properties of CrCo 2 O 4 have been investigated using DFT. Activated carbon (AC) and polypyrrole (PPY) have been introduced to hybridize with CrCo 2 O 4 to enhance its electrochemical performance. The high conductivity of PPY, along with the high surface area and excellent cycling stability of AC, synergistically boosts the performance of CrCo 2 O 4 . The ternary composite CrCo 2 O 4 /AC/PPY exhibited a higher capacitance of 991.25 F g −1 than the pristine CrCo 2 O 4 (301.53 F g −1 ) at 5 mV s −1 . The composite also displayed high cycling stability with 84.25% capacitive retention after ten thousand cycles. The composite also delivered a lower charge transfer resistance (0.36 Ω), which resulted in better charge transfer. A HSC with CrCo 2 O 4 /AC/PPY as the positive electrode and MnO 2 /AC as the negative electrode was fabricated that delivered a high energy density of 97.77 W h kg −1 and power of 1.6 kW kg −1 . A high capacitive retention of 76.75% was observed for ten thousand cycles. The practicality of the prepared material was tested by connecting three hybrid cells in series to illuminate a panel of 57 LEDs. The panel was able to glow for 51 minutes. The outstanding performance of the composite reveals the excellent possibility for application in high-performance advanced hybrid SCs. The synergistic integration of PPY and AC with chromium cobaltite leads to the development of advanced electrode materials for hybrid supercapacitors.