High energy density hybrid supercapacitor based on cobalt-doped nickel sulfide flower-like hierarchitectures deposited with nitrogen-doped carbon dots. Issue 3 (8th January 2021)

• Record Type: Journal Article
• Authors: Ji, Zhenyuan; Liu, Kai; Dai, Wenyao; Ma, Dongwei; Zhang, Hongyan; Shen, Xiaoping; Zhu, Guoxing; Wu, Shikui
• Is Part Of: Nanoscale. Volume 13:Issue 3(2021)
• Page Start: 1689
• Page End: 1695
• Publication Date: 2021-01-08
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0nr07851d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A hybrid supercapacitor with decent energy density and cycling stability was constructed by using Co-NiS/NCDs flower-like hierarchitectures and PPD/rGO nanosheets as cathode and anode, respectively. Abstract : The exploration of advanced electrode materials with outstanding electrochemical properties is of considerable importance for hybrid supercapacitors but challenging. In this paper, an effective two-step solvothermal route is demonstrated to synthesize nitrogen-doped carbon dots (NCDs) decorated cobalt-doped nickel sulfide (Co-NiS) flower-like hierarchitectures. Because of the modification with NCDs and doping by cobalt atoms, the resulting Co-NiS/NCDs hierarchitectures exhibit an ultrahigh specific capacity up to 1240 C g −1 (2480 F g −1 ) at 1 A g −1 and a remarkable rate capability of 790.8 C g −1 (1581.6 F g −1 ) even at 20 A g −1 when used as advanced electrodes for supercapacitors. More significantly, coupling with ap-phenylenediamine (PPD) modified reduced graphene oxide (rGO) anode, a hybrid supercapacitor device is successfully constructed, which possesses an impressive energy density of 71.6 W h kg −1 at 712.0 W kg −1 and a decent cyclic stability with 78.3% retention after 12 000 cycles at 5 A g −1 . The dual improvement strategy may provide insight to rational engineering of novel electrode materials with multi-components for high-performance hybrid supercapacitors.