Rational design of CoNiMo trimetallic hydroxide nanostructured flexible electrode for supercapacitor application

Abstract

Trimetallic CoNiMo-hydroxide nanoflakes structure has been effectively prepared on carbon cloth using hydrothermal method. Structural and morphology analysis of the prepared samples has been performed using XRD, FTIR, and FESEM. Galvanostatic charging–discharging (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) analysis offer valuable insights into the electrochemical properties of the synthesized materials. In this study, varying molar ratios of Co, Ni, and Mo salts are employed to modulate the morphology and electrochemical characteristics of the samples. As the concentration of Mo changes, the morphology transitions from nanorods to nanoflakes, which contributes to an increase in the specific capacitance (C_sp) of the electrode. For CoNiOH, obtained C_sp value is 66.28 F/g at current density of 1A/g which is enhanced to 293.4 F/g at 1 A/g by incorporating Mo in an optimized concentration ratio. The CoNi_(1-x)Mo_xOH electrode exhibits a significant specific capacitance of 307.8 F/g at 0.5 A/g current density. This electrode also showed good cyclic stability (i.e., the capacitance retention of 80% after 1200 cycles). Based on the performance, CoNi_(1-x)Mo_xOH as a hybrid supercapacitive material has high prospective for applications involving energy storage devices.