Abstract
Most oxygen evolution reaction (OER) electrocatalysts show poor stability under industrial alkaline conditions (20–30 wt.% KOH). Therefore, it is essential to develop stable, efficient, and low-cost OER catalysts for industrial water electrolysis. Herein, we present a straightforward approach for the complete electrochemical reconstruction of Ni-BDC, a Ni-based metal-organic framework, for OER. This method involves the continuous release of Fe3+ from Fe foam counter electrode in a high-concentration (6.0 M, 25 wt.%) KOH solution. The continuously Fe3+ releasing not only realizes in situ Fe3+ doping, but also introduces abundant defects in the obtained catalyst during cyclic voltammetry activation, thereby accelerating the electrochemical reconstruction. The reconstructed OER catalyst (Fe-doped nickel hydroxide/oxyhydroxide nanosheets supported on Ni foam, Fe-NiOx(OH)y/NF) manifests a low overpotential of 217 mV at 10 mA cm−2 and 263 mV at 100 mA cm−2 in 1.0 M KOH. Noteworthy, the Fe-NiOx(OH)y/NF also demonstrates high stability in 30 wt.% KOH. This strategy of regulating the electrochemical reconstruction process sheds light on the construction of stable and efficient OER catalysts for industrial water electrolysis.
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Acknowledgements
This work was supported by the China Postdoctoral Science Foundation (2022T150502) and the National Energy-Saving and Low-Carbon Materials Production and Application Demonstration Platform Program (TC220H06N).
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Supporting information The supporting information is available online at http://chem.scichina.com and http://springerlink.bibliotecabuap.elogim.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.
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Supporting Information: Continuous Fe3+ Releasing Enabled Complete Reconstruction of Ni-Based MOF for Promoted Water Oxidation in Industrial Alkali
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Wang, Z., Zhang, W., Huang, W. et al. Continuous Fe3+ releasing enabled complete reconstruction of Ni-based MOF for promoted water oxidation in industrial alkali. Sci. China Chem. 67, 2949–2957 (2024). https://doi.org/10.1007/s11426-024-2125-5
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DOI: https://doi.org/10.1007/s11426-024-2125-5