High‐Performance Aqueous Asymmetric Supercapacitors Based on Microwave‐Synthesized Self‐Supported NiCo2O4 Nanograss and Carbide‐Derived Carbon. Issue 10 (11th March 2020)

• Record Type: Journal Article
• Authors: Zhang, Fang; Su, Can; Wen, Fusheng; Mu, Congpu; Li, Xuecong; Ming, Xianbing
• Is Part Of: ChemistrySelect. Volume 5:Issue 10(2020)
• Page Start: 2865
• Page End: 2870
• Publication Date: 2020-03-11
• Subjects: NiCo2O4 -- carbide-derived carbon -- nanoparticles -- cyclic voltammetry -- asymmetric supercapacitor; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201904167
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: A binder‐free supercapacitor electrode of NiCo2 O4 nanograss coated on nickel foam (NF) was prepared by single‐mode microwave method along with calcination, displaying a higher specific capacitance (1042 F/g at 1 mV/s). Furthermore, we demonstrate excellent electrochemical performance of NiCo2 O4 nanograss as anode electrode and carbide‐derived carbon as cathode electrode. The resultant asymmetric supercapacitors possess high specific capacitance (105.6 F/g at 1 mV/s), good cycling stability (retention capacitance of 78.5% after 5000 cycles), high energy density (32.9 Wh/kg) and large power density (970.1 W/kg), which has potential application in energy storage devices. Abstract : NiCo2 O4 nanograss have average diameters of about 50 nm and a rough surface. Apparently, nanograss consist of many nanoparticles with size of about 10–20 nm. The retention capacitance of 78.5% after 5000 cycles and high energy density of 32.9 Wh/kg at a power density of 79.2 W/kg have been obtained in NiCo2 O4 //carbide‐derived carbon asymmetric supercapacitor. These results illustrated that NiCo2 O4 with excellent cycling and capacity performances can be used as a promising electrode material for energy storage applications.