Leekeshwer Upadhyay, S. Dhanapandian, S. Suthakaran, BhoomikaYadav, Kamal K. Kar, Anju Dixit, Devendra Kumar, Suresh Sundaramurthy, Manikandan Ayyar
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引用次数: 0
Abstract
The current experimental investigation emphases on the synthetization and characterizations of pure and Fe3+& Cu2+ co-doped [Ni0.5Fe0.02Cu0.06Ox, Ni0.5Fe0.04Cu0.04Ox, and Ni0.5Fe0.06Cu0.02Ox] NiO nanoparticles (NPs) prepared through the hydrothermal method for improved supercapacitor performance. The synthesized NiO NPs were subjected to annealing at 800 °C and subsequently examined using a range of characterization methods.The XRD analysis verified the existence of a face-centered cubic (FCC) structure.The FESEM-EDAX confirmed successful dopant incorporation, revealing changes in surface morphology and particle size. An enhancementin the optical bandgap from 3.15 to 3.45 eV was found by the UV–Vis-DRS study, indicating the possibility of quantum confinement effects. The XPS provided insights into the surface chemistry, confirming the presence and concentrations of Ni2+, Fe3+ and Cu2+ ions in their respective chemical states. BET analysis indicated a reduction in the specific surface areafrom 18.59 m2/g (pure NiO) to 11.04 m2/g (co-doped NiO), but an increase in pore diameter facilitates ion diffusion. Electrochemical analysis showed that [Ni0.5Fe0.06Cu0.02Ox] achieved a highest specific capacitance of 546 F g−1, at 10 mVs−1exhibiting significantly superior performance than pure NiO NPs.This study highlighted the potential of Fe3+ and Cu2+ co-doped NiO NPs in enhancing the electrochemical performance of supercapacitors through improved charge storage capacity and conductivity.Furthermore, cyclic stability testing revealed that the co-doped sample retained approximately 92.12% of its initial capacitance after 2000 charge–discharge cycles, demonstrating excellent long-term electrochemical durability. These results underline the importance of doping in optimizing material properties for next-generation energy storage devices, making these nanoparticles a promising candidate for sustainable and high-performance supercapacitors.
期刊介绍:
The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.