@Article{ee.2026.087353,
AUTHOR = {Masoumeh Ghalkhani, Hamidreza Mohammad Hoseini, Javad Beheshtian, Rüstem Keçili},
TITLE = {One-Step Electrodeposited Binder-Free MnO<sub>2</sub>-NiO–rGO Composite for High-Performance Supercapacitor Electrodes},
JOURNAL = {Energy Engineering},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/energy/online/detail/27836},
ISSN = {1546-0118},
ABSTRACT = {The development of efficient, low-cost, and scalable electrode materials is vital for advancing high-performance supercapacitors. Despite recent progress, many fabrication routes remain complex, expensive, or dependent on polymer binders that reduce conductivity and long-term stability. Therefore, the objective of this study was to develop a simple, binder-free electrode with enhanced electrochemical performance. In this work, we report a one-step electrodeposition method for fabricating a manganese nickel oxide–reduced graphene oxide (MnO<sub>2</sub>-NiO–rGO) composite electrode directly on nickel foam. This facile technique employs an aqueous suspension of graphene oxide (GO) enriched with nickel and manganese salts, enabling the simultaneous formation of a three-dimensional porous network without any binder or additional reducing agent. Structural and morphological analyses conducted via X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and elemental mapping confirmed the successful formation of a well-integrated nanocomposite. Electrochemical evaluations using cyclic voltammetry, galvanostatic charge–discharge, impedance spectroscopy, and cycling tests revealed that the optimized MnO<sub>2</sub>-NiO–rGO composite exhibits a specific capacitance of 462.5 F/g at a current density of 5 A/g. The porous architecture enhances ion accessibility and promotes efficient charge storage and rapid transport. Notably, the electrode demonstrated excellent long-term stability, retaining 94% of its initial capacitance after 1000 cycles in alkaline electrolyte. These results highlight the potential of the MnO<sub>2</sub>-NiO–rGO composite as a promising candidate for next-generation energy storage applications.},
DOI = {10.32604/ee.2026.087353}
}