Multi-walled carbon nanotubes decorated ZnMoO₄ nanoflakes and their supercapacitive property

In this work, multi-walled carbon nanotubes decorated ZnMoO₄ nanoflakes are synthesized by facile and rapid template-free hydrothermal approach. The prepared materials are characterized by various characteristic techniques. The synthesized materials are subjected as electrode materials for supercapacitive properties. The specific capacitance of 737 F g⁻¹ is obtained at the current density of 1 A g⁻¹ from ZnMoO₄ nanoflakes. Further, the capacitance of prepared material is improved by doping a small amount of multiwall carbon nanotubes (MWCNTs). As a result, the specific capacitance of 1004 F g⁻¹ is observed at 1 A g⁻¹ from MWCNT/ZnMoO₄ composite. The constancy of the prepared materials is performed up to 5000 cycles at 5 A g⁻¹. Further, aqueous asymmetric supercapacitor is also designed by MWCNT/ZnMoO₄ (as positive electrode) and activated carbon (AC) (as negative electrode). The high energy density of 28.61 W h kg⁻¹ is calculated with power density of 725.52 W kg⁻¹ from MWCNT/ZnMoO₄//AC device. In addition, two yellow color LEDs are also powered by series connected two MWCNT/ZnMoO₄//AC devices.