Ultra-dispersed island-like Co9S8 nanoparticles composed of nanosheets in-situ grown on nitrogen-doped graphene for asymmetric supercapacitor

作者：Wang, Xuezhao; Su, Dangcheng; Xiao, Yuanhua^*; Xu, Shengang; Fang, Shaoming^*; Cao, Shaokui^*

来源：Electrochimica Acta, 2019, 293: 419-425.

DOI：10.1016/j.electacta.2018.10.059

• Co9S8
• Graphene
• Supercapacitor
• Composites

Island-like Co9S8 nanoparticles composed of two-dimensional (2D) Co9S8 nanosheets in-situ grew and were dispersed evenly on the surface of 2D N-doping graphene (NGR), which produced the Co9S8@NGR nanocomposites using a simple solvothermal method. In this solvothermal process, graphene oxides were reduced and doped with nitrogen (N) simultaneously. The Co9S8@NGR nanocomposites delivered an ultra-high specific capacitance of 2992 Fg(-1) in a potential window of 0.5 Vat 1 A g(-1). Moreover, an asymmetric supercapacitor (ASC) constructed by Co9S8@NGR as the positive electrode and by activated carbon (AC) as the negative electrode showed the density of 88.81 W h kg(-1) at a power density of 0.63 kW kg(-1), the power density of 21.80 kW kg(-1) at the energy density of 30.30 W h kg(-1), and the favorable cycle stability with 80.61% specific capacity retention at a current density of 10 A g(-1) after 10000 cycles.

• 出版日期2019-1-10
• 单位郑州大学; 郑州轻工业大学