Cobalt sulfide @ CNT-CNF for high-performance asymmetric supercapacitor
A cobalt sulfide encapsulated within carbon nanotube-carbon nanofiber (Co9S8@CNT-CNF) nanohybrid electrode is designed and prepared. The physicochemical characterization such as X-ray diffraction (XRD) and electron microscopy revealed the formation of Co9S8@CNT-CNF. The specific capacitance of Co9S8@CNT-CNF is 1656 F g−1 at 1 A g−1 with good electrochemical cycle stability (92.6% up to 10,000 cycles). The Co9S8@CNT-CNF electrode exhibits a maximum power density of 8.83 kW kg−1 with an energy density of 65 Wh kg−1, while a maximum energy density of 175 Wh kg−1 is attained at a power density of 463 W kg−1. This impressive electrochemical performance of the Co9S8@CNT-CNF composite indicated significant potential for application in high-power and energy-storage devices.
KeywordsCarbon nanotube Carbon nanofiber Cobalt sulfide Nanocomposite Supercapacitor
We gratefully acknowledge the financial support by the Natural Science Foundation of Anhui Province (KJ2018A0534), the research fund of Anhui Science and Technology University (ZRC2014402), and the innovation and entrepreneurship training program for college students (2505160307).