Journal
CHEMICAL ENGINEERING JOURNAL
Volume 416, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129500
Keywords
Triple-shelled hollow nanostructure; Amorphous Ni-Co-S; Crystalline MnS; Hollow carbon nanospheres; All-solid-state hybrid supercapacitors
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Funding
- National Natural Science Foundation of China [51772156, 51872144]
- Natural Science Foundation of Jiangsu Province [BK20180019]
- Opening Project of the Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials [JSKC20021]
- PAPD of Jiangsu
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Designing novel electrode materials with controlled structure and composition is challenging, but a triple-shelled hollow nanostructure has been successfully designed here, showing improved electrochemical activity, fast electronic/ion transport, mechanical stability, and enhanced charge storage. This electrode material delivers high specific capacity and outstanding cyclic stability, leading to a long cycle life and high energy density in all-solid-state hybrid supercapacitors.
Designing novel electrode materials with controlled structure and composition remains a great challenge for high-performance supercapacitors. Here, a triple-shelled hollow nanostructure has been successfully designed and constructed by confining amorphous Ni-Co-S/crystalline MnS on the inner walls and the outer surfaces of hollow carbon nanospheres. The triple-shelled hollow nanostructure can improve the electrochemically active surface areas, accelerate the transport of electrons/ions, and accommodate the volume change during cycling. Additionally, the interlayer (the porous hollow carbon nanospheres) can support each other for enhanced mechanical stability and improve the electrical conductivity of the electrode. More importantly, amorphous Ni-Co-S facilitates diffusion and redox reaction of OH?, while the crystalline MnS offers fast electrons transport and mechanical stability. Meanwhile, the amorphous/crystalline interface can improve charge storage. Benefiting from the structural and compositional advantages, the prepared electrode delivers a high specific capacity (1093C g-1 at 1 A g-1) and outstanding cyclic stability (capacity retention ratio of 90.4% at 10 A g-1 after 5000 cycles). The corresponding all-solid-state hybrid supercapacitor achieves long cycle life and high energy density.
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