Electropolymerization of an Ultra-thin Film on bimetallic nanocomposite: Enhanced performance, perfect stability for supercapacitors

Abstract

This research focused on synthesizing nanocomposites from vanadium-1.3.5-benzene tricarboxylic acid (V-BTC), vanadium-molibden-1.3.5-benzene tricarboxylic acid (V-BTC-Mo), and vanadium-molibden-1.3.5-benzene tricarboxylic acid/poly-orto-aminophenol (V-BTC-Mo/POAP) using chemical and electrochemical methods. The materials were analyzed using various analytical techniques such as XRD, FT-IR, FE-SEM, Elemental Mapping, and Edx. The SEM images revealed a nanorod structure of metal-organic framework (MOF) with a high specific surface area (SSA) of 131.13 m².g⁻¹ determined by nitrogen adsorption-desorption analysis. Electrochemical techniques including galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) were employed to assess the supercapacitor (SC) properties. The results indicated that the V-BTC-MO/POAP composite exhibited a high specific capacitance (Cs) of 420.2 F g⁻¹, with a high energy density of 38.1 Wh kg⁻¹ at a power density of 236.2 W kg⁻¹. Also, the V-BTC-Mo/POAP electrode demonstrated a good performance in structural stability by maintaining 97.3 % of the initial capacitance after 5000 continuous charge-discharge. Overall, the research aimed to develop a new methodology for synthesizing bimetallic nanocomposites and enhancing the performance of SCs in a three and two-electrode system, particularly focusing on vanadium and MOF-based electrodes.