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Low-temperature coating of Mn2O3–MoS2 micro-nano-heterostructure anode as an efficient catalyst for water splitting applications

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Abstract

Binder-free Mn2O3–MoS2 hybrid composites (HCs) were fabricated using a room temperature kinetic spray process under low-pressure conditions with various weight ratios of Mn2O3-to-MoS2 (1:1, 1:2, and 1:4). The effect of the composition ratio on the electrocatalytic activity of Mn2O3–MoS2 HCs toward the oxygen evolution reaction (OER) in an alkaline medium was investigated. The deposited MoS2 exhibits microrods (MRs) morphology, while pure Mn2O3 exhibits nanoflakes (NFs) morphology. The Mn2O3–MoS2 HCs exhibited NFs-decorated MR morphology. Multilayer heterostructure morphology significantly improves the interfacial synergy between various electroactive species that were verified using various spectroscopic techniques such as micro-Raman and X-ray photoemission spectra. As the MoS2 content in the Mn2O3–MoS2 HCs increased, the interfacial charge transfer kinetics associated with the reduction in the oxidation barrier potential improved. The Mn2O3–MoS2 HCs with a 1:4 ratio demonstrated the optimum combination for OER with the smallest overpotential of 290 mV @ 10 mA cm−2 and Tafel slope of 41 mV dec−1. The long-term OER stability of the fabricated electrocatalysts was verified using chronopotentiometry techniques for 50 h at 50 mA cm−2.

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Acknowledgements

This work was supported by the 2024 Research Fund of the University of Ulsan.

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Ulsan, Ulsan, 44610, Korea

    A. G. Abd-Elrahim, Deepto Roy, Muhammad Shehroze Malik & Doo-Man Chun

  2. Physics Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt

    A. G. Abd-Elrahim

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AGA contributed to conceptualization, data curation, methodology, formal analysis, investigation, validation, writing—original draft, and writing—review and editing. DR and MMS contributed to conceptualization, methodology, and investigation. DC contributed to conceptualization, investigation, funding acquisition, project administration, validation, writing—original draft, and writing—review and editing.

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Correspondence to Doo-Man Chun.

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Supplementary Information

SEM images, EDS spectra of powder; EDS mapping of deposited nanostructured thin films, Raman spectra of micron powder; XPS survey spectra and high-resolution XPS scans of S 2p, Mo 3d, O1s, and Mn 2p of nanostructured films of Mn2O3, MoS2, and Mn2O3–MoS2 NCs; CV plots from to 0.1 V vs. Hg/HgO and the corresponding ECSA; XPS after OER stability test, and OER performance comparison table.

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Abd-Elrahim, A.G., Roy, D., Malik, M.S. et al. Low-temperature coating of Mn2O3–MoS2 micro-nano-heterostructure anode as an efficient catalyst for water splitting applications. J Mater Sci 59, 7332–7355 (2024). https://doi.org/10.1007/s10853-024-09620-6

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