High-performance pseudo-capacitor energy storage device based on a hollow-structured copper sulfide nanoflower and carbon quantum dot nanocomposite. (1st September 2020)

• Record Type: Journal Article
• Authors: Quan, Yiling; Wang, Guoxiang; Lu, Lu; Wang, Zhixin; Xu, Hongfeng; Liu, Sa; Wang, Dazhi
• Is Part Of: Electrochimica acta. Volume 353(2020)
• Publication Date: 2020-09-01
• Subjects: Supercapacitors -- Carbon quantum dot -- Nanoflower-like -- Hollow structure -- One-step solvothermal synthesis; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136606
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Transition metal sulfides are widely used in high-performance energy storage equipment due to its excellent electrochemical activity and electrical conductivity. In this study, we introduce a carbon quantum dot (CQD)-doped hollow CuS composite (CuS@CQDs) as a novel electrode material for advanced asymmetric supercapacitors through one-step solvothermal synthesis and an impregnation bonding method. The CuS@CQDs composites with uniform and hierarchical porous architecture possess high specific area and low specific resistance, which can facilitate the transport of electrolytes and electrons. The as-prepared CuS@CQDs-ICM electrode exhibits a maximum specific capacitance of 920.5 F g −1 at a current density of 0.5 A g −1 and an energy density of 44.19 W h kg −1 at a power density of 397.75 W kg −1 with an excellent cycling stability of 92.8% after 10, 000 cycles. The satisfactory electrochemical performance can be attributed to the unique nanoflower-like hollow structure of the CuS@CQDs composites and the synergy between CuS and CQDs.