超级电容器
石墨烯
电极
材料科学
电容
硫化镍
电化学
镍
电解质
双金属片
纳米技术
化学工程
无机化学
化学
金属
冶金
物理化学
工程类
作者
Tianjiao Ma,Hong Liu,Ying Wang,Mingmei Zhang
标识
DOI:10.1016/j.electacta.2019.04.079
摘要
Developing a convenient synthetic strategy to achieve graphene based composites with ideal electrochemical properties is still a huge challenge. In this work, three-dimensional sulfur doped graphene supported by nickel-iron bimetallic sulfides (NiFeS2/3DSG) as high performance supercapacitors electrode are fabricated by one-step microwave alcohothermal method, in which mercaptoacetic acid is applied as sulfur source of doped graphene as well as precursor of nickel-iron sulfide. The 3DSG not only exhibits space laminated structure with ideally pore sizes and large specific surface area, but also increases the binding of nickel-iron precursor through chemical bonds of sulfur. NiFeS2/3DSG electrode has reflected in the specific capacitance of 643.9 C g−1 (1073.2 F g−1) at the current density of 1 A g−1 in 6.0 M KOH electrolyte. Furthermore, the asymmetric supercapacitor device is constructed of NiFeS2/3DSG electrode as positive electrode and 3DSG as negative electrode (NiFeS2/3DSG//3DSG), which delivers a superior energy density of 45.7 Wh kg−1 at a power density of 222 W kg−1 under a wide potential range of 1.6 V. After 5000 cycles of charge and discharge, the specific capacitance of this device hold the retention rate of 82%. These results indicate that the graphene based hybrid with outstanding electrochemical performance could be a strong competitive prospect in the applications of supercapacitor.
科研通智能强力驱动
Strongly Powered by AbleSci AI