材料科学
电化学
介孔材料
循环伏安法
电极
化学工程
电容
超级电容器
纳米结构
纳米技术
储能
兴奋剂
催化作用
化学
光电子学
有机化学
量子力学
物理
工程类
物理化学
功率(物理)
作者
Nagesh Maile,Mokrema Moztahida,Ahsan Abdul Ghani,Mumtaz Hussain,Khurram Tahir,Bolam Kim,Surendra K. Shinde,V. J. Fulari
标识
DOI:10.1016/j.cej.2021.129767
摘要
In this study, various nanostructures of Mn-doped Co3O4 were synthesized on Ni foam using binder-free electrochemical technology for electrochemical energy storage applications. Using the cyclic voltammetry method with different scan rates, diverse nanostructures, i.e., irregularly oriented nanooctahedra, interconnected standing nanosheets, and nanopetals of Mn-doped Co3O4, were obtained. The standing interconnected nanosheets on the Ni foam exhibited remarkable supercapacitive performance due to the void space between the sheets and mesoporous structure, which provided additional active sites for faradic transitions. The nanosheets exhibited excellent electrochemical performance with a maximum specific capacitance of 1005F g−1 and a cyclic stability of 88% during 5000 charge–discharge cycles. Moreover, an asymmetric supercapacitor was assembled comprising activated carbon on Ni foam and interconnected nanosheets of Mn-doped Co3O4 on Ni foam as negative and positive electrodes, respectively. This assembled device exhibited an improved potential of 1.6 V, a maximum specific energy of 20.6 Wh kg−1, and a maximum specific power of 16 kW kg−1 with 80.6% capacity retention after 2000 charge–discharge cycles, which is superior for SC devices.
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