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Efficient Nitrate to Ammonia Conversion on Bifunctional IrCu4 Alloy Nanoparticles.
1School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518000, China.
This study introduces an IrCu4 alloy catalyst for efficient electrochemical nitrate reduction to ammonia, a sustainable alternative to Haber-Bosch. The bifunctional catalyst suppresses hydrogen evolution and enhances ammonia production with high efficiency.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Electrochemical nitrate reduction (NO3RR) to ammonia offers a sustainable alternative to the Haber-Bosch process.
- Competing hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) hinder efficiency and increase energy consumption.
Purpose of the Study:
- To design a bifunctional catalyst for efficient NO3RR and OER while suppressing HER.
- To optimize NO3RR via a tandem approach using bifunctional catalysts.
Main Methods:
- Synthesis of IrCu4 alloy nanoparticles.
- Electrochemical evaluation of NO3RR and OER performance.
- Testing in a flow electrolyzer under simulated working conditions.
Main Results:
- IrCu4 alloy nanoparticles demonstrated high Faradaic efficiency (93.6%) for NO3RR.
- The catalyst exhibited excellent OER performance with a low overpotential (260 mV at 10 mA cm-2).
- Stable ammonia production was achieved for 50 hours in a flow electrolyzer.
Conclusions:
- IrCu4 alloy nanoparticles effectively function as a bifunctional catalyst for NO3RR and OER.
- Operating NO3RR at positive potentials with the IrCu4 catalyst suppresses HER and enhances ammonia yield.
- This research presents a viable pathway for improving NO3RR through bifunctional catalysts in tandem systems.
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