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Ferromagnetic Fe-TiO2 spin catalysts for enhanced ammonia electrosynthesis.
Jingnan Wang1,2, Kaiheng Zhao3, Yongbin Yao4
1Institute of Molecular Engineering Plus, College of Chemistry, Fuzhou University, Fuzhou, 350108, China.
Nature Communications
|January 28, 2025
Summary
Ferromagnetic iron-titanium oxide (Fe-TiO2) catalysts show magnetic field effects for nitrate electroreduction to ammonia. Applying a magnetic field significantly boosts ammonia production efficiency and yield.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Ferromagnetic spin electrocatalysts offer potential for enhanced catalytic activity via magnetic field effects (MFE).
- No ferromagnetic catalysts have shown MFE for nitrate electroreduction to ammonia (NO3RR).
Purpose of the Study:
- To investigate MFE on NO3RR using ferromagnetic Fe-TiO2.
- To explore the potential of Fe-TiO2 as a spin catalyst for ammonia synthesis.
Main Methods:
- Synthesis of Fe-TiO2 with atomically dispersed Fe sites and intermediate-spin state.
- Electrocatalytic nitrate reduction reaction (NO3RR) measurements under varying magnetic field conditions.
- In-situ characterization and theoretical calculations to elucidate the mechanism.
Main Results:
- Fe-TiO2 demonstrated significant MFE on NO3RR.
- Achieved up to 97% Faradaic efficiency (FE) and 24.69 mg mgcat-1 NH3 yield at -0.5 V vs RHE with magnetic field assistance.
- FE and NH3 yield increased by ~21.8% and ~3.1 times, respectively, under magnetic field compared to no field.
Conclusions:
- Spin polarization in Fe-TiO2 enhances NO3RR activity by optimizing electron transfer during NO hydrogenation.
- Fe-TiO2 is a promising ferromagnetic catalyst for efficient ammonia production via NO3RR with MFE.
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