Chemically synthesized mesoporous nickel cobaltite electrodes of different morphologies for high-performance asymmetric supercapacitors. (25th November 2022)

• Record Type: Journal Article
• Authors: Bulakhe, Ravindra N.; Shin, Su Cheol; In, Jung Bin; In, Insik
• Is Part Of: Journal of energy storage. Volume 55:Part C(2022)
• Publication Date: 2022-11-25
• Subjects: Nickel cobaltite -- Hexagonal -- Nanowires -- Asymmetric supercapacitor -- Energy density; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.105730
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: A facile, inexpensive, and template-free strategy has been investigated for the synthesis of nickel cobaltite (NiCo2 O4 ; NCO) for different morphologies on conducting nickel foam using two different complexing agents' ammonia solution (AMM) and hexamethyltetrammine (HMT) and investigated for supercapacitor applications. The nickel cobaltite exhibits a mesoporous structure with pore diameters of 16 and 19 nm and provides a high specific surface area of 150, and 100 m 2 ·g −1 for NCO-AMM and NCO-AMM, respectively. The NCO-HMT electrode exhibit higher specific capacities (2195.8 C·g −1 /2744.8 F g −1 at 4 A.g −1 ) than the NCO-AMM electrode (1579.7 C·g −1 / 1974.6 F g −1 at 4 A. g −1 ) with high capacity retention ( ̴ 86 %). Excellent cyclic stabilities of 95 and 97 % are obtained from NCO-AMM and NCO-HMT electrodes over 10, 000 cycles. A fabricated ASC coin cell (NCO-HMT//rGO) enables a high operation potential window (1.6 V), and an excellent energy density of 60 Wh·kg −1 with a power density of 5500 W·kg −1 . The NCO-HMT//rGO also exhibits outstanding cyclic stability of 90 % over 10, 000 charge-discharge cycles at 10 A·g −1 current density. This facile synthesis approach provides a superior strategy for producing mesoporous nanomaterials for high-performance ASC. Graphical abstract: Unlabelled Image Highlights: Hydrothermal technique was used to prepare nickel cobaltite (NCO). NCO hexagonal cubes and nanosheets composed wire structures prepared. Unique NCO morphology provides interesting properties. NCOs used to prepare a coin cell asymmetric supercapacitor. Excellent cyclic stability is observed.