Manganese oxide and urea-assisted engineering of nickel-iron compounds for high-performance battery-supercapacitor hybrid devices
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Author list: Dong S.-F.; Cheshideh H.; Kongvarhodom C.; Saukani M.; Yougbaré S.; Chen H.-M.; Wu Y.-F.; Lin L.-Y.
Publisher: Elsevier
Publication year: 2025
Journal: Journal of Environmental Chemical Engineering (2213-2929)
Volume number: 13
Issue number: 3
ISSN: 2213-2929
eISSN: 2213-3437
Languages: English-Great Britain (EN-GB)
Abstract
Nickel-iron metal-organic framework (NiFe-MOF) has emerged as a promising active material for energy storage due to its large surface area, tunable porosity, and multiple redox states. However, its inherently poor electrical conductivity hinders charge transport, limiting energy and power densities. Enhancing conductivity and optimizing the structural configuration are crucial for improving electrochemical properties. MnO2 exhibits strong pseudocapacitive behavior due to multiple oxidation states, while urea regulates pH and modulates material nucleation and growth. In this study, Mn ions and urea are simultaneously introduced into NiFe-MOF to tailor electronic and structural properties, facilitating efficient charge storage for battery-supercapacitor hybrids (BSHs). Influences of Mn ions and urea concentrations on morphology, composition, and electrochemical properties are systematically examined. The optimized MnO2/NiFe-MOF electrode achieves a remarkable specific capacitance (CF) of 1423.0 F/g, corresponding to a specific capacity of 996 C/g at 20 mV/s, attributed to well-ordered sheet-like structures that maximize electrolyte accessibility and charge-transport pathways. A BSH assembled with the optimized MnO2/NiFe-MOF positive electrode and a carbon-based negative electrode demonstrates a superior energy density of 2.0 kWh/cm2 at a power density of 6.4 W/cm2, along with outstanding cycling durability with the CF retention of 88.8% and Coulombic efficiency of 96.7 % after 6000 charge/discharge cycles. © 2025 Elsevier Ltd.
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