Tailoring the Effect of NiCo‐Metal‐Organic Frameworks by Doping Manganese as a Highly Active Redox Electrode for Electrochemical Energy Storage Technologies: Supercapattery Devices

Abstract

Metal–organic frameworks with complex geometry have garnered significant attention in technological fields due to their diverse properties. Multimetallic metal‐organic frameworks (MOFs) have potential to demonstrate superior conductivity and efficiency compared to pristines, but, they have not been explored to research on large scale. Herein, significant effect of binary (NiCo‐) and ternary (NiCoMn‐) MOFs is explored with a novel approach using an organic ligand hexamethylene tetra‐amine (HMT). The as‐synthesized MOFs with their distinctive structures are thoroughly examined to analyze their structural, morphological, and electrochemical properties. In a standard half‐cell setup, the electrochemical behaviors of both samples are investigated, as both electrodes exhibit specific capacities of 349 and 905 C g−1, at 3 mV s−1, individually. Due to promising electrochemical responses of NiCoMnMOF, a supercapattery device is constructed as NiCoMnMOF//AC. This hybridization leads to the remarkable specific energy (78 Wh kg−1) and specific power (3500 W kg−1) with stability rate of ≈96% and Coulombic efficiency of 99% after undergoing 5000 galvanostatic charge–discharge cycles, making it highly suitable for modern applications. To gain better insight of supercapattery device, a semiempirical approach is employed, using Dunn's modulation. Thus, the synergy of NiCoMnMOF//AC in the single hybrid device exhibiting battery‐like characteristics holds tremendous potential for driving innovations in energy storage technology.

Elucidating Electrochemical Energy Storage Performance of Unary, Binary, and Ternary Transition Metal Phosphates and their Composites with Carbonaceous Materials for Supercapacitor Applications

“…TEM image represents the composite which was composed of phosphide nanoparticles (NPs) and phosphate phases. The electrochemical properties of nanocomposites increased due to the amorphous nature of phosphates and phosphides [138] [139]. The presence of P, Ni, Co, and C in composite was verified by EDX evaluation.…”