Abstract
The innovative investigation into Mn:Co3O4 samples through a multifaceted approach encompassing diverse characterization methodologies and electrochemical assessments. Employing X-ray diffraction, we unveiled the internal geometry and crystallite disposition, which impeccably matched the spinel-cubic structure of Co3O4. X-ray photoelectron spectroscopy analysis meticulously corroborated the existence of Co, Mn, and O elements while unveiling distinctive valence states for Co and Mn ions. On further analysis, scanning electron microscopy provides a visual insight into granular, hexagonal-shaped layered structures, with varying pore abundance among the all temperatures. The compositional integrity is confirmed through energy-dispersive X-ray spectroscopy. Electrochemical investigations encompass cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). The CV curves exhibit redox peaks denoting pseudo-capacitive behavior, while GCD profiles display symmetric behavior. The specific capacitance at various scan rates highlights the superior performance of the Mn:Co3O4 sample at 700 °C. EIS analyses affirm low interfacial charge resistance and accelerated ion diffusion. Cyclic stability assessment over 1500 cycles underscores the enduring process of Mn:Co3O4 culminating in a favorable specific capacitance of 625 F/g and a remarkable capacity retention of 96% even after 1500 cycles.
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Data availability
The data that support the findings of this study are available from the corresponding author, Dr. R. Mariappan, upon reasonable request.
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Acknowledgements
The authors extend their heartfelt gratitude to the University Grants Commission-South Eastern Regional Office (UGC-SERO), Hyderabad (India), for their generous financial support through Project No. MRP-4892/14 (SERO/UGC). Additionally, they would like to acknowledge the invaluable support received from Adhiyamaan College of Engineering (Autonomous), Hosur, Krishnagiri and Government Engineering College, Bargur, Tamilnadu, India.
Funding
This research received funding from the University Grants Commission-South Eastern Regional Office (UGC-SERO), Hyderabad, India, under project number MRP-4892/14 (SERO/UGC), with Dr. R. Mariappan serving as the Principal Investigator (PI).
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The initial draft of the manuscript was authored by AK, while RM contributed to the conceptualization, methodology, investigation, data curation, and writing, reviewing, and editing of the manuscript.
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Karthikeyan, A., Mariappan, R. Characterization and electrochemical performance of Mn-doped Co3O4 nanoparticles for supercapacitor applications. J Mater Sci: Mater Electron 34, 2092 (2023). https://doi.org/10.1007/s10854-023-11493-5
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DOI: https://doi.org/10.1007/s10854-023-11493-5