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• W4362638508 endingPage "102764" @default.
• W4362638508 startingPage "102764" @default.
• W4362638508 abstract "Atomically-dispersed FeN4 moieties are emerging as low-cost electrocatalysts for oxygen reduction reaction (ORR), which can be applied in fuel cells and metal-air batteries. Whereas, the unsatisfactory position of the d-band center from the metal sites offered by FeN4 affects the adsorption-desorption behaviors of oxygenated intermediates, further impeding the improvement of their ORR performances. Herein, we report a well-designed diatomic Fe/Zn-CNHC catalyst on a microporous hollow support. This strategy drives the position of the d-band center of Fe upward, thus making FeN4 active sites more favorable and stable during the ORR kinetic processes. The material exhibits an excellent ORR activity with a half-wave potential of 0.91 V and excellent stability (insignificant attenuation after 5,000 cycles), surpassing commercial Pt/C and many other single-atom catalysts. DFT calculations further indicate that the tuning effect of Zn on the d-orbital electron distribution of Fe facilitates the stretching and cleavage of Fe-O, thus accelerating the rate-determining step. This work presents a simple strategy to fabricate well-defined diatomic coordination in single-atom ORR electrocatalysts and inspires future research on developing new syntheses to control the coordination of single-atom electrocatalysts." @default.
• W4362638508 created "2023-04-07" @default.
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• W4362638508 date "2023-05-01" @default.
• W4362638508 modified "2023-10-17" @default.
• W4362638508 title "Engineering d-band center of FeN4 moieties for efficient oxygen reduction reaction electrocatalysts" @default.
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• W4362638508 doi "https://doi.org/10.1016/j.ensm.2023.04.003" @default.
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