Novel one-step synthesis for 3-D four-pointed micro-star of quaternary metal (Mo-V-Mn-Ag) oxide electrode for asymmetric supercapacitor

An intention of the present work is to synthesize a quaternary metal oxide by a simple and cost-effective method. MoVMnAg-oxide@Ni-foam is synthesised by one-step hydrothermal method. The as-deposited MoVMnAg-oxide sample is systematically examined through XRD, FESEM, EDS-mapping, and TEM analysis. The electrochemical performance of an MoVMnAg@Ni-foam electrode is tested using CV, GCD, and EIS techniques. MoVMnAgoxide@Ni-foam has a considerable high areal capacitance of 651 mFcm(-2) with 0.13 mWhcm(-2) energy at 1.8 mWcm(-2) power density in 1 M KOH electrolyte calculated from GCD curves. Also, the electrode shows a diffusion coefficient of 1.52 x 10(-7) cm(2) s(-1) along with 91 % of diffusive-controlled contribution and a b-value of 0.51, which depicts faradaic charge storage mechanism. An assembled asymmetric supercapacitor device (MoVMnAg@Ni-foam//AC) delivers an areal capacitance of 312 mFcm(-2) with 0.37 mWcm(-2) power density at 1 mAcm(-2) current density within 0 - 1.5 V voltage window. The asymmetric device showed cyclability and coulombic efficiency of 80.3% and 95% respectively measured up to 10,000 GCD cycles. These results demonstrate the deposition of quaternary metal oxide directly on Ni-foam showing highly competitive electrochemical performance so that they can be utilized in energy storage applications.

Automated summary

The present work aims to synthesize a quaternary metal oxide by a simple and cost-effective method and analyze its electrochemical performance. The results show that the synthesized MoVMnAg-oxide@Ni-foam has high areal capacitance and energy storage density, making it suitable for energy storage applications.