Oxygen vacancy-engineered Fe₂O₃ nanocubes via a task-specific ionic liquid for electrocatalytic N₂ fixation

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Electrocatalytic nitrogen fixation is crucial for sustainable ammonia production.
• Developing efficient catalysts for nitrogen fixation under ambient conditions remains a challenge.

Purpose of the Study:

• To propose a novel task-specific ionic liquid strategy for designing oxygen vacancy-rich α-Fe2O3 nanocubes.
• To investigate the electrocatalytic performance of these nanocubes for nitrogen fixation to ammonia.

Main Methods:

• Synthesis of α-Fe2O3 nanocubes using a task-specific ionic liquid strategy.
• Characterization of the nanocubes for oxygen vacancies and morphology.
• Electrochemical testing for N2 reduction to NH3 at ambient conditions.

Main Results:

• Achieved a high ammonia formation rate of 32.13 μg h-1 mgcat-1.
• Obtained a faradaic efficiency of 6.63% for ammonia production at -0.3 V vs. RHE.
• Demonstrated the effectiveness of oxygen vacancies in enhancing catalytic activity.

Conclusions:

• The task-specific ionic liquid strategy is a viable approach for creating advanced electrocatalysts.
• Oxygen vacancy-rich α-Fe2O3 nanocubes show significant potential for ambient electrocatalytic N2 fixation.
• This work opens new avenues for sustainable ammonia synthesis.