High-performance supercapacitors based on reduced graphene oxide -wrapped carbon nanoflower with efficient transport pathway of electrons and electrolyte ions. (20th May 2019)

• Record Type: Journal Article
• Authors: Ding, Feng; Yu, Zhisheng; Chen, Xing; Chen, Xi'an; Chen, Chuansheng; Huang, Yaqi; Yang, Zhi; Zou, Chao; Yang, Kenqin; Huang, Shaoming
• Is Part Of: Electrochimica acta. Volume 306(2019)
• Page Start: 549
• Page End: 557
• Publication Date: 2019-05-20
• Subjects: High-performance supercapacitors -- Reduced graphene oxide - wrapped carbon nanoflower -- Hybrid carbon -- Efficient electrons and ions transfer -- Ionic liquid electrolyte; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.03.155
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Despite that a variety of carbon materials have been explored for electrochemical energy storage, rationally design the carbon structure for efficient electrons transfer and ions diffusion to further improve its performance is still a challenge. In this report, a novel three-dimension hybrid carbon material (NCNF/RGO) prepared from reduced graphene oxide (RGO) and N-doped carbon nanoflower (NCNF) consisting of carbon nanosheets has been fabricated by a hydrothermal treatment and freeze-drying method, and demonstrated as supercapacitor's electrode. Benefiting from such structure design with thin porous nanosheets, interworking mesoporous channel and RGO wrapping for efficient electrolyte ions diffusion and electrons transfer, the resulting hybrid electrode displays high specific capacitance of 344 F g −1 at a current density of 0.5 A g −1 and 179 F g −1 even at 50 A g −1 in the KOH electrolyte, and 152 F g −1 at 1 A g −1 in the ionic liquid electrolyte with a wide voltage range. Significantly, the assembled symmetric supercapacitor using the NCNF/RGO as electrode materials reaches a large energy density of 84.2 Wh Kg −1 at a power density of 1.0 kW kg −1, indicating its great potential application. Graphical abstract: Image 1 Highlights: A novel three-dimension hybrid carbon material consisting of RGO and N-doped carbon nanoflower was fabricated. As-prepared hybrid carbon delivers good capacitive performance both in the KOH and ionic liquid electrolyte. The symmetric supercapacitor exhibits integrated large energy and power density. The enhancement on capacitive performance is ascribed to the efficient transport pathway of electrons and ions.