Exploring the potency of EDTA-based Ni-Co-MOF nanospheres for highly durable battery-supercapacitor hybrids

Abstract

Metal Organic Frameworks (MOFs) have emerged as a captivating avenue and advancement in electrode materials, revealing remarkable progress in diverse electrochemical applications. However, despite their apparent potential the persistent hurdles related to specific capacity, degradation in specific energy and power, and reproducibility of results emphasized the demand for focused investigation. This study is objectized to improve the storage capability, stability, and replicability of electrochemical outcomes in a MOF-based battery-supercapacitor hybrid system. To achieve the quest Ethylenediaminetetraacetic acid (EDTA) based Ni-Co-MOF nanospheres were synthesized via hydrothermal route. The bimetallic MOF demonstrates unique redox behavior with a specific capacity of 474.56 C/g at a current density of 1 A/g. Simulating the experimental analysis, it was confirmed that the MOF material exhibits a dominant battery-like nature, with 94.68 % diffusion attributes at a scan rate of 3 mV/s. Integrating nanospheres MOF into an asymmetric hybrid architecture, serving as the positive electrode material, exceptional specific energy and power characteristics reaching 72.58 Wh/kg and 8500 W/kg respectively. Moreover, the MOF-based hybrid configuration demonstrated remarkable cycle stability, retaining 93.2 % of its capacity after undergoing 10,000 charge discharge cycles. Notably, the hybrid device exhibited excellent reproducibility, with a specific energy output of 71.43 Wh/kg after 40 days and 70.33 Wh/kg after 80 days under standard environmental conditions. Additionally, the simulation approach results indicated that the battery-supercapacitor hybrid device exhibited a diffusion dominance of 76.42 % at a scan rate of 30 mV/s and a capacitive contribution of 61.66 % at 100 mV/s. These promising findings underscore the potential of Ni-Co-MOF-based hybrid configuration as a strong entrant for practical applications in efficient energy storage systems.