A new strategy for the preparation of multi-walled carbon nanotubes/NiMoO4 nanostructures for high-performance asymmetric supercapacitors

Over the past decade, boosting the electrical conductivity of nickel molybdate materials has been established to improve their supercapacitive performance. Nevertheless, it is significant to investigate a different approach from economic efficiency and operation time perspectives. Herein, we first prepare NiMoO4 nanoparticles using a simple ball-milling technique and then serve them in two different multi-walled carbon nanotubes (MWCNTs)/ NiMoO4 composites fabricated using simple blending and ball-milling. The ball-milled nanocomposite delivers outstanding supercapacitive properties because of its good surface area, outstanding conductivity, fast kinetics, and many active sites. Its specific capacitance reached 727.2 F g-1 at 1 A g-1 and 709.8 at 10 mV sec- 1, and cycling stability was measured to be 86.8 % after 2000 cycles at a current density of 20 A g-1, surpassing the other two samples. An asymmetric device based on ball-milled composite nanostructure resulted in a high specific energy of 40.9 Wh kg-1, a remarkable specific power of 918.5 W kg-1, an appealing rate performance of 73.6 % at 50 A g-1 current density, and a superb cycling durability of 85.4 %. As a result, combining storage attributes of NiMoO4 and MWCNTs with the ball-milling route provides a new strategy to enhance the elec-trochemical properties of nickel molybdate.

Automated summary

Over the past decade, researchers have focused on enhancing the electrical conductivity of nickel molybdate materials to improve their supercapacitive performance. In this study, NiMoO4 nanoparticles were prepared using a simple ball-milling technique and incorporated into multi-walled carbon nanotubes (MWCNTs) through blending and ball-milling. The resulting ball-milled nanocomposite exhibited excellent supercapacitive properties due to its high surface area, conductivity, fast kinetics, and active sites.