Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 7, Pages 6667-6677Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00747
Keywords
supercapacitor; Mo doping; electrodeposition; battery type; good rate capability
Funding
- National Natural Science Foundation of China [51772267]
- Science and Technology Program of Guangxi Zhuang autonomous region [ZD20302001]
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Both composition and nanostructure are crucial for the electrochemical properties of transition-metal compounds. Rational elemental doping and nanostructure design can enhance Faradaic redox reaction kinetics and increase electroactive sites. In this study, a hierarchical core-shell nanoarray electrode was successfully synthesized, demonstrating high areal capacity and notable rate capability, with an asymmetric supercapacitor device achieving a high energy density at a specific power density.
Both composition and nanostructure play vital roles in the electrochemical properties of the transition-metal compounds. Rational elemental doping and nanostructure design could accelerate the Faradaic redox reaction kinetics and increase the electroactive sites. Herein, we have successfully synthesized core-shell structure nanoarrays where (Ni,Co)Se-2 nanowires directly grow on activated carbon cloth as the conductive core to support an Mo-doped NiCoP nanosheet shell. This hierarchical nanoarray electrode exhibits a high areal capacity of 1.99 C/cm(2) at 2 mA/cm(2) (a gravimetric specific capacity of 797 C/g) and notable rate capability (1.54 C/cm(2) at 50 mA/cm(2)). The asymmetric supercapacitor device assembled using (Ni,Co)Se-2@Mo-NiCoP as the cathode and activated carbon as the anode exhibits a high energy density of 33.7 Wh/kg at a power density of 800 W/kg.
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