Journal
APPLIED SURFACE SCIENCE
Volume 561, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150049
Keywords
Hierarchical Ni3S2/CoFe LDH/NF hybrid; High-performance; Asymmetric supercapacitor (ASC); Hydrothermal synthesis; Electrodeposition
Categories
Funding
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_0090]
- Guiding Local Science and Technology Development Projects by the Central Government of China [YDZX20191400002796]
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The study presents a novel hybrid material of layered double hydroxides (LDHs) nanosheets with exceptional areal capacitance and rate capability, as well as high power and energy density in an asymmetric supercapacitor.
Transition metal layered double hydroxides (TM LDHs) nanosheets have stimulated tremendous research enthusiasm, which is gifted with their tunable chemical compositions, large layer distances and superior electrochemical performance. However, the small number of electroactive sites and the low electrical conductivity have restricted their applications in electrode materials. Herein, we construct a hierarchical Ni3S2/CoFe LDH/Ni foam (Ni3S2/CoFe LDH/NF) hybrid by a facile hydrothermal synthesis followed by an electrodeposition without using any chemical binder. The as-constructed Ni3S2/CoFe LDH/NF exhibits an ultrahigh areal capacitance of 5.08 F cm(-2) and an excellent rate capability with a capacitance retention of 73.8% at the high current density of 20 mA cm(-2). Furthermore, the constructed asymmetric supercapacitor (ASC) based on the Ni3S2/CoFe LDH/NF anode and the activated carbon (AC) cathode shows both a high power density of 986 W kg(-1) and a high energy density of 47.31 Wh kg(-1) with high cycling stability of 93.4% initial capacitance after 5000 cycles, demonstrating an enormous potential for the practical application in energy storage devices.
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