Abstract
The development of oxygen evolution reaction (OER) catalysts with high activity, long-term stability, and cost-effectiveness is crucial in large-scale hydrogen production. In this study, we present a simple and efficient synthesis strategy for MnCoO catalysts using a two-step co-precipitation and annealing method. MnCoO-1 and MnCoO-2 were synthesized with different Mn:Co precursor ratios (1:3 and 2:2, respectively), resulting in enhanced electrocatalytic activity for OER in an alkaline electrolyte. MnCoO-1 exhibited hexagonal plate morphology, while MnCoO-2 showed cubic nanostructures with a small number of nano-plates. Compared to Co3O4 and MnCoO-2, MnCoO-1 demonstrates a significantly lower overpotential, achieving an OER current density of 75 mA cm−2 at 546.0 mV, indicating enhanced OER activity. Moreover, MnCoO-1 achieves an even higher OER current density of 100 mA cm−2 at an overpotential of 606 mV versus RHE, which is considerably lower than the overpotentials observed for Co3O4 (733.7 mV) and MnCoO-2 (776.0 mV) catalysts. This improvement can be attributed to the unique morphology and structure of MnCoO-1, where Mn ions were efficiently incorporated into the Co3O4 lattice without disrupting its crystal structure. Furthermore, MnCoO-1 demonstrated remarkable long-term electrochemical stability against OER in a 1.0 M KOH aqueous electrolyte, maintaining a high current density of 50 mA cm−2 in 24 h.
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Acknowledgments
This research is funded by the Institute of Materials Science, Vietnam Academy of Science and Technology, under Grant Number CS.12/21-22.
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Viện Khoa học vật liệu, Viện Hàn lâm Khoa học và Công nghệ Việt Nam (CS.12/21-22).
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HTB: conceptualization, investigation, and writing—original draft; HHP and DCL: electrochemical measurement; NDL and TTAN: sample preparation, investigations, and characterizations; VTKO: sample SEM characterization; ATP and PTS: writing—review and editing; NHT and J-YK: XPS measurement, fitting, and writing.
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Bui, H.T., Hanh, P.H., Lam, N.D. et al. Efficient Synthesis and Enhanced Electrochemical Performance of MnCoO Catalysts for Oxygen Evolution Reaction. J. Electron. Mater. 53, 53–64 (2024). https://doi.org/10.1007/s11664-023-10802-2
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DOI: https://doi.org/10.1007/s11664-023-10802-2