Reagent-assisted hydrothermal synthesis of NiCo2O4 nanomaterials as electrodes for high-performance asymmetric supercapacitors. (10th May 2021)

• Record Type: Journal Article
• Authors: Lu, Zhe; Xuan, Dipan; Wang, Dechao; Liu, Jie; Wang, Zhuang; Liu, Qian; Wang, Duo; Ye, Yueyuan; Zheng, Zhifeng; Li, Shuirong
• Is Part Of: New journal of chemistry. Volume 45:Number 20(2021)
• Page Start: 9230
• Page End: 9242
• Publication Date: 2021-05-10
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj00268f
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Spinel nickel cobaltate nanoneedle arrays in situ synthesized by a CTAB assisted hydrothermal method show an energy density of 22.5 W h kg −1 at 800 W kg −1 . Abstract : In this study, mesoporous nickel cobaltate (NiCo2 O4 ) nanomaterials were loaded onto nickel foam through a simple and environment-friendly reagent assisted hydrothermal method. The impacts of reagents on the micro-morphology and electrochemical capacitive properties were studied. The NiCo2 O4 nanoneedle arrays prepared with cetyltrimethylammonium bromide (CTAB) as the auxiliary reagent exhibited a relatively higher specific surface area, convenient charge transport channel, excellent specific capacitance (1153.2 F g −1 at a current density of 1 A g −1 ), remarkable rate performance (10 A g −1, 812 F g −1 ) and good cycling stability (75% of the initial value is retained at 10 A g −1 after 1000 cycles). The asymmetric supercapacitor assembled by the optimized NiCo2 O4 nanomaterial as the positive electrode and activated carbon as the negative electrode provides an energy density of 22.5 W h kg −1 at 800 W kg −1, and displays an excellent cycle performance of 97.1% after 1000 cycles at 1 A g −1 . It is suggested that the CTAB-assisted nanoneedle array-structured NiCo2 O4 electrode material could be a potential candidate for supercapacitors.