Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.438
Publication date: 16th December 2024
Inspired by the active sites of the nitrate and nitrite reductase enzymes, we will introduce in this talk bio‑inspired strategies to design heterogeneous catalysts for NO3RR with enhanced selectivity, activity, and stability.
Thanks to the development of an Fe-substituted molybdenum carbide MXene catalyst, Mo2CTx:Fe, we demonstrated via a combination of in situ X-ray absorption spectroscopy and density functional theory calculations that the Fe sites facilitates the formation of oxygen vacancies, which served as active sites for nitrate reduction, mimicking the mechanism of enzymatic nitrate reductase.[1] Building on this result, which highlights the importance of oxygen vacancies to provide binding sites for nitrate, we developed a reduced molybdenum oxide shell grown on dendritic nickel foam (MoOx/NiNF).[2] This catalyst displays a substantial presence of oxygen vacancies, as confirmed by X-ray photoelectron spectroscopy and in situ Raman spectroscopy, and exhibits very high NO3RR performance, achieving an FE of 99% and an ammonia yield rate of 4.29 mmol h-1 cm-2 at −1.0 V vs. RHE in neutral media, while maintaining operational stability for over 3100 hours at high current densities.
Finally, we will present novel strategies for ammonia recovery in nitrate and NOx reduction, enhancing the efficiency and practicality of NO3RR and paving the way for more scalable and applicable ammonia production methods.[3]
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