Journal
ACS ENERGY LETTERS
Volume 6, Issue 5, Pages 1677-1683Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c00127
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Funding
- Recruitment Program of Thousand Youth Talents
- Natural Science Foundation of China [22072013]
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The study introduces a robust iron-based catalyst with fast regeneration ability for stable oxygen production in alkaline electrolytes, providing a key strategy for designing powerful OER catalysts.
The iron-based catalysts are promising for the oxygen evolution reaction (OER) in alkaline media, yet the inherent dissolution of high-valent iron species induced performance decay during electrocatalysis remains a critical challenge. Herein, we present a robust iron-based catalyst (Fe-cat) that exhibits a fast ligand-induced regeneration ability, allowing for stable production of oxygen even in a 5.0 M NaOH electrolyte containing iron-2,2'-bipyrimidine (Fe-bpym). Using electrochemical methods and in situ UV-vis and electron paramagnetic resonance, we revealed the coordination configuration transition between the Fe-bpym in electrolytes and the Fe-cat on the electrode during the whole catalyst deposition-solution ligand repairing-catalyst regeneration process. The fast regeneration ability of the active Fe sites endures a long-term OER activity over 200 h with a low overpotential of 320 mV at 1.0 mA cm(-2). This study provides an important strategy to design the robust OER catalysts through in situ regeneration of active metal sites on an electrode.
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