Pseudo spin-ladder CaCu2O3 nanostructures as potential electrode material for asymmetric supercapacitors. (April 2022)

• Record Type: Journal Article
• Authors: Veerapandi, G.; Prabhu, S.; Ramesh, R.; Govindan, R.; Sekar, C.
• Is Part Of: Journal of energy storage. Volume 48(2022)
• Publication Date: 2022-04
• Subjects: Pseudo spin-ladder CaCu2O3 -- Supercapacitor -- Battery-like behavior -- Asymmetric device; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.104051
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: A pseudo spin-ladder CaCu2 O3 nanostructure has been used as an electrode material. The 2-leg ladder system CaCu2 O3 displayed specific capacitance of 205.45 F g −1 at 1.5 A g −1 . The CaCu2 O3 revealed an excellent cyclic stability (104%) even after 10000 continuous cycles. Asymmetric supercapacitor device delivered the energy density of 11.8 Wh kg -1 at the power density of 362.5 W kg -1 . Abstract: Supercapacitors have attracted noteworthy attention due to their high power density and excellent cyclic stability than batteries, despite the limited energy density of the supercapacitors which discourages their practical application. Herein, we have demonstrated the application of a pseudo spin-ladder CaCu2 O3 (2-leg) nanostructures as an efficient electrode for the fabrication of a high-performance asymmetric supercapacitor (ASC). CaCu2 O3 has received a lot of attention due to its unique magnetic properties and its close relation to high temperature superconductors. The number of Cu-O chains (legs) found in the spin ladder structure of this compound is responsible for its low dimensional magnetism with the Neel temperature of ∼25 K. Electrochemical analysis has revealed that the specific capacitance (specific capacity) of CaCu2 O3 based supercapacitor is 205.45 F g −1 (92.45 C g -1 ) at a current density of 1.5 A g −1 and furthermore CaCu2 O3 nanostructures exhibited excellent cyclic stability with capacitance retention of 104% after 10000 continuous cycles. The assembled ASC device (CaCu2 O3 //AC (activated carbon)) delivered the energy density of 11.8 Wh kg -1 at the power density of 362.5 W kg -1 . Evidently, the energy density of 2.21 Wh kg -1 is still retained even at a high power density of 3625 W kg -1 . The obtained results demonstrated that the spin-ladder CaCu2 O3 electrode materials are potential candidates for high-energy storage applications. Graphical abstract: Image, graphical abstract