Evaluating the role of current collectors in supercapacitor electrodes with NiCo2O4 nanospheres. (July 2023)

• Record Type: Journal Article
• Authors: Yadav, Sarita; Ghrera, Aditya Sharma; Rana, Abhimanyu; Devi, Ambika
• Is Part Of: Journal of physics and chemistry of solids. Volume 178(2023)
• Publication Date: 2023-07
• Subjects: Supercapacitor -- Nickel cobaltite -- Current collectors; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2023.111347
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Supercapacitor as an electrochemical energy storage device is well known for delivering high power density than batteries but faces the challenge of lower electrical energy density. To overcome this limitation, researchers are exploring new and advanced nanostructured electrode materials, particularly metal oxides, and composites. Most of the supercapacitor research is focused on investigating electrode materials, which are important in determining the device's electrochemical performance. Along with this premise, this study says that a current collector (CC) plays an essential part in an electrode's electrochemical performance and is just as important as the electrode material. It is crucial to investigate the role of current collectors in supercapacitor electrode electrochemical performance. In this study, four different current collectors are used to deposit NiCo2 O4 (NCO) as the active electrode material: nickel foam (Ni), flexible graphite sheet (FG), copper foil (Cu), and stainless-steel foil (SS). The electrochemical tests are performed with and without active material loaded on different CCs and investigated for the contribution made by each CC. Results indicate that Ni foam possesses its own specific capacity of 128 Fg -1 and as an electrode, NCO–Ni delivered the highest specific capacity of 960 Fg -1 at a current density of 1 Ag -1, compared with NCO-FG (237 Fg −1 ), NCO–Cu (169 Fg −1 ), and NCO-SS (64 Fg −1 ) electrodes. Graphical abstract: Image 1 Highlights: NiCo2 O4 nanospheres have been successfully synthesized by the solvothermal technique. The nanoporous material has been slurry coated on different current collectors and evaluated for electrochemical performance. The fabricated NiCo2 O4 –Ni electrode delivered the highest specific capacity of 960 Fg -1 at a current density of 1 Ag -1 compared to other electrodes. A symmetric coin cell supercapacitor based on NiCo2 O4 –Ni electrode delivered an energy density of 25 Wh kg −1 at a power density of 648.41 W kg −1 .