Abstract
A simple and robust method has been proposed to synthesize manganese oxide polymorphs wherein the phase transition among the manganese oxides crystal structures was evidenced under the assistance of fuels via solution combustion route. The cubic-Mn2O3 dominated with glycine and urea, while spinel tetragonal-Mn3O4 was favored with sucrose, citric acid and maleic acid fuels. The average particle size of 17 nm and 21 nm is observed for Mn2O3 derived from urea and glycine respectively. The Mn2O3 derived from urea (Mn2O3–U) exhibits high fraction of Mn3+ content and oxygen defects on the surface compared to the Mn2O3 derived from glycine (Mn2O3–G). In addition, Mn2O3–U exhibits ~ 5 times higher electrochemical active surface area (237 cm−2) compared to Mn2O3–G (47.5 cm−2). Owing to the enhanced surface properties, Mn2O3–U demonstrates superior OER performance where it exhibits a low overpotential of 270 mV at the current density of 10 mA cm−2 compared to Mn2O3–G (590 mV 10 mA cm−2). The Mn3O4 derived from sucrose (Mn3O4–S), citric acid (Mn3O4–C) and maleic acid (Mn3O4–M) exhibits inferior OER performance compared to Mn2O3 and followed the order: Mn2O3–U > Mn2O3–G > Mn3O4–S > Mn3O4–C > Mn3O4–M. The findings of the results collectively suggest that the fuel alters the surface structure and crystallization process, with further impacts the electrocatalytic performance.
Graphical abstract
Fuels used in the synthesis step altered the crystallization kinetic and surface structural features.
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Acknowledgements
The authors are grateful to the management of REVA University for providing seed money grant bearing file number RU/R&D/SEED/CHE/2023/16 to carry out this research work.
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Sagar P: Experimental design, Carrying out measurements Ashoka S: Manuscript composition Srinivasa N: Conception Yogesh K: Carrying out measurements Girish Kumar S: Manuscript Revision.
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Sagar, P., Ashoka, S., Srinivasa, N. et al. Fuel assisted crystal structure tailoring of manganese oxides and their surface reactivity towards oxygen evolution reaction. J Mater Sci (2024). https://doi.org/10.1007/s10853-024-09908-7
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DOI: https://doi.org/10.1007/s10853-024-09908-7