writer：Yongkun Liu, Guohua Jiang,* Bo Yu, Uwamahoro Evariste, Pianpian Ma*
keywords：carbon spheres; NiCo2S4; electrochemical properties; supercapacitors
source：期刊
specific source：ACS Applied Energy Materials
Issue time：2019年

Abstract: In this paper, the seasame-ball-like core-shell hollow mesoporous carbon spheres decorated by NiCo2S4 nanoparticles (NiCo2S4/HMCSs) were prepared via a hydrothermal method. The obtained NiCo2S4/HMCSs could be used as the positive electrodes for asymmetric supercapacitors (ASCs), combining the outstanding electroconductivity of carbonic materials and high capacity of NiCo2S4 nanoparticles. The morphology and structure properties of the obtained NiCo2S4/HMCSs were characterized. The electrochemical properties of the as-obtained composites were characterized by electrochemical workstation, showing an outstanding capacity of 1098.5 F·g-1. Finally, ASCs were further fabricated by using the NiCo2S4/HMCSs as cathode and hollow mesoporous carbon spheres (HMCSs) as anode. Moreover, the assembled ASCs exhibited a good energy density of 35.1 Wh·kg-1 at a moderate power density about 203.5 W·kg-1 and good cycle abilitywith ~ 90 % even after 3000 cycles.