期刊
JOURNAL OF MATERIALS SCIENCE
卷 56, 期 14, 页码 8613-8626出版社
SPRINGER
DOI: 10.1007/s10853-021-05810-8
关键词
-
资金
- National Natural Science Foundation of China [51572218]
- Key Project of Research & Development of Shaanxi Province in China [2018ZDCXL-GY-08-05]
The binary MnCo2O4@NiO hierarchical electrode was successfully fabricated on nickel foam without binder or additives, featuring abundant surface active sites, large buffering space, and improved contacting area and electric conductivity. The electrode demonstrated higher specific capacitance and long cycle lifespan, showing potential for high performance supercapacitor electrode.
Although many researches have been made in the construction and fabrication of electrode materials for supercapacitors, it remains a difficult task to realize the application of the supercapacitor with high energy density. The binary MnCo2O4@NiO hierarchical electrode has been successfully fabricated on nickel foam (NF) without any binder or additives by simple hydrothermal methods and corresponding annealing processes. By virtue of constructing hierarchical core-shell structure with different morphologies and forming additive-free electrode, the composite electrode not only possesses abundant surface active sites for electrochemical reaction as well as large buffering space for volume deformation in the charging-discharging processes, but also shows the improved contacting area and electric conductivity between active substance and metal collector. The synthetic MnCo2O4@NiO/NF electrode presented higher specific capacitance (1186 F g(-1) under 1 A g(-1)) and long cycle lifespan (maintain 91% of the original capacitance over 5000 cycles) under a high current density of 10 A g(-1). Further, the asymmetric supercapacitor with MnCo2O4@NiO/NF electrode shows higher energy density of 42.2 Wh kg(-1) under a power density of 748.2 W kg(-1). These results demonstrate that the binary MnCo2O4@NiO hierarchical structure is the hopeful candidate material for high performance supercapacitor electrode.
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