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Spin polarized Fe1−Ti pairs for highly efficient electroreduction nitrate to ammonia

MPG-Autoren
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Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Dai, J., Tong, Y., Zhao, L., Hu, Z., Chen, C.-T., Kuo, C.-Y., et al. (2024). Spin polarized Fe1−Ti pairs for highly efficient electroreduction nitrate to ammonia. Nature Communications, 15(1): 88, pp. 1-11. doi:10.1038/s41467-023-44469-4.


Zitierlink: https://hdl.handle.net/21.11116/0000-000E-2CF9-9
Zusammenfassung
Electrochemical nitrate reduction to ammonia offers an attractive solution to environmental sustainability and clean energy production but suffers from the sluggish *NO hydrogenation with the spin–state transitions. Herein, we report that the manipulation of oxygen vacancies can contrive spin−polarized Fe1−Ti pairs on monolithic titanium electrode that exhibits an attractive NH3 yield rate of 272,000 μg h−1 mgFe−1 and a high NH3 Faradic efficiency of 95.2% at −0.4 V vs. RHE, far superior to the counterpart with spin−depressed Fe1−Ti pairs (51000 μg h–1 mgFe–1) and the mostly reported electrocatalysts. The unpaired spin electrons of Fe and Ti atoms can effectively interact with the key intermediates, facilitating the *NO hydrogenation. Coupling a flow−through electrolyzer with a membrane-based NH3 recovery unit, the simultaneous nitrate reduction and NH3 recovery was realized. This work offers a pioneering strategy for manipulating spin polarization of electrocatalysts within pair sites for nitrate wastewater treatment. © 2024, The Author(s).