Nickel-iron catalysts represent an appealing platform for electrocatalytic oxygen evolution reaction (OER) in alkaline media because of their high adjustability in components and activity. However, their long-term stabilities under high current density still remain unsatisfactory due to undesirable Fe segregation. Herein, a nitrate ion (NO ) tailored strategy is developed to mitigate Fe segregation, and thereby improve the OER stability of nickel-iron catalyst. X-ray absorption spectroscopy combined with theoretical calculations indicate that introducing Ni (NO ) (OH) with stable NO in the lattice is conducive to constructing the stable interface of FeOOH/Ni (NO ) (OH) via the strong interaction between Fe and incorporated NO . Time of flight secondary ion mass spectrometry and wavelet transformation analysis demonstrate that the NO tailored nickel-iron catalyst greatly alleviates Fe segregation, exhibiting a considerably enhanced long-term stability with a six-fold improvement over FeOOH/Ni(OH) without NO modification. This work represents a momentous step toward regulating Fe segregation for stabilizing the catalytic performances of nickel-iron catalysts.
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Article Synopsis
- The study focuses on creating effective and affordable electrocatalysts for water electrolysis, vital for improving technology in this area.
- The authors developed a novel catalyst by anchoring carbonyl iron powder in nickel foam, leading to enhanced surface area and efficient ion movement.
- The catalyst exhibits high activity due to a dynamic interaction between different nickel and iron phases, significantly boosting its performance in the oxygen evolution reaction.
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