Designing novel Bi-metallic MOFs with optimized Ni and Co ions ratios for enhanced supercapacitor performance

Abstract

The goal of this work is to assess the novel supercapacitors (Btc-Im-DMF-Ni_x/Co_y) by creating new bimetallic MOFs. The structure of novel bimetallic MOFs is based on the incorporation of varied Ni and Co ions ratios, as well as a large hetero-organic frame containing imidazole (Im), dimethyl formamide (DMF), and benzene tri carboxylic acid (BTC). Furthermore, the effect of the Ni_x:Co_y ratio on the performance of supercapacitors was investigated for Btc-Im-DMF-Ni₂/Co₁ and Btc-Im-DMF-Ni₁/Co₂. The new materials were created to compensate for the conventional superapcitors' low energy density. The electrochemical performance of the novel materials is examined by a number of electrochemical studies, including galvanostatic charge/discharge (GSCD), cyclic voltammetry (CV), and surface analysis. The Btc-Im-DMF-Ni₁/Co₂ has an optimum capacitance of 1640 F g⁻¹ at 1.0 A g⁻¹, in contrast to Btc-Im-DMF-Ni₂/Co₁, which shows a capacitance of 1234 F g⁻¹ at 1.0 A g⁻¹. After 5000 cycles, Btc-Im-DMF-Ni₁/Co₂ has a greater cycling stability (91 %) than Btc-Im-DMF-Ni₂/Co₁ (85.3 %). The Co to Ni ratio of the Btc-Im-DMF-Nix/Coy has a significant impact on the electrochemical activity of the supercapacitor. Within the MOFs network, Co and Ni have shown improved capacity and cycle stability due to their easier electron transport and lower deprotonation energy.