Hydrothermal Synthesis of CoMoO4/Co9S8 Nanorod Arrays on Nickel Foam for High-Performance Asymmetric Supercapacitors with High Energy Density

作者：Xu, Rui^*; Lin, Jianming^*; Wu, Jihuai; Huang, Miaoliang; Fan, Leqing; He, Xin; Wang, Yiting; Xu, Zedong

来源：Electrochimica Acta, 2017, 252: 470-481.

DOI：10.1016/j.electacta.2017.08.148

• Asymmetric supercapacitor
• Cobalt molybdate
• Nanorod arrays
• Hydrothermal route

CoMoO4/Co9S8 nanorod arrays supported on nickel foam are successfully assembled via a facile two-step hydrothermal route. Due to the unique nanorod array structure, the CoMoO4/Co9S8, as the electrode, possesses a high capacity 1.54 mA h.cm (2) (343.21 mA h.g (1)) and a large capacitance 9.17 F cm (2) (2059.26 F g (1)) at a current density of 20 mA.cm (2) (4.44 A.g (1)), and an excellent cycling stability (8.6% degradation after 3000 cycles). The asymmetric supercapacitor based on the CoMoO4/Co9S8 nanorod arrays as a positive electrode and porous active carbon as a negative electrode in an alkaline KOH aqueous electrolyte is fabricated. Owing to the synergetic effect between CoMoO4/Co9S8 and active carbon, CoMoO4/Co9S8//active carbon asymmetric supercapacitor exhibits an outstanding energy density of 42 Wh.kg (1) and an excellent cycling stability with 89.5% specific capacitance retained after 5000 cycles in an operating voltage of 1.6 V. The facile synthesis route and remarkable supercapacitive performance of the CoMoO4/Co9S8 nanorod arrays is promising as a positive electrode materials for high-performance asymmetric supercapacitors.

• 出版日期2017-10-20
• 单位华侨大学