Abstract
Electrochemical NO2−-to-NH3 conversion (NO2RR) offers a green route to NH3 electrosynthesis, while developing efficient NO2RR catalysis systems at high current densities remains a grand challenge. Herein, we report an efficient Zr-NiO catalyst with atomically dispersed Zr-dopants incorporated in NiO lattice, delivering the exceptional NO2RR performance with industrial-level current density (>0.2 A cm−2). In situ spectroscopic measurements and theoretical simulations reveal the construction of Zr-Ni frustrated Lewis acid-base pairs (FLPs) on Zr-NiO, which can substantially increase the number of absorbed nitrite (NO2−), promote the activation and protonation of NO2− and concurrently hamper the H coverage, boosting the activity and selectivity of Zr-NiO towards the NO2RR. Remarkably, Zr-NiO exhibits the exceptional performance in a flow cell with high Faradaic efficiency for NH3 of 94.0% and NH3 yield rate of 1,394.1 µmol h−1 cm−2 at an industrial-level current density of 228.2 mA cm−2, placing it among the best NO2RR electrocatalysts for NH3 production.
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This work was supported by the National Natural Science Foundation of China (52161025) and the Natural Science Foundation of Gansu Province (20JR10RA241).
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Zhang, Y., Li, Z., Du, W. et al. Efficient nitrite-to-ammonia electroreduction over Zr-Ni frustrated Lewis acid-base pairs. Sci. China Chem. 67, 1707–1714 (2024). https://doi.org/10.1007/s11426-023-1924-7
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DOI: https://doi.org/10.1007/s11426-023-1924-7