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Updated: Jun 17, 2025
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Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
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Promoting the OH cycle on an activated dynamic interface for electrocatalytic ammonia synthesis
Jiabao Lv1,2, Ang Cao1,3, Yunhao Zhong1
1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, P. R. China.
Nature Communications
|August 6, 2024
Summary
This study reveals a novel OH cycle mechanism for electrocatalytic nitrate conversion using nickel hydroxide (Ni(OH)₂). Activating surface vacancies enhances this cycle, achieving nearly 100% Faradaic efficiency for green ammonia production.
Area of Science:
- Electrochemistry
- Catalysis
- Environmental Science
Background:
- Electrocatalytic nitrate conversion is key for ammonia synthesis and pollution control.
- Complex proton-electron transfer mechanisms hinder energy efficiency.
Purpose of the Study:
- Investigate the reaction interface dynamics of electrocatalytic nitrate conversion.
- Elucidate the mechanism to improve energy efficiency.
Main Methods:
- Utilized Ni(OH)₂ as a model catalyst.
- Employed in-situ spectroscopy and isotopic labeling to identify reaction intermediates.
- Introduced surface vacancies via plasma treatment to activate the catalyst.
Main Results:
- Proposed an OH cycle mechanism involving a locally OH-enriched microenvironment.
- Achieved nearly 100% Faradaic efficiency for nitrate electroreduction.
- Demonstrated that activated interfaces accelerate the OH cycle and suppress hydrogen evolution.
Conclusions:
- Rational activation of dynamic interfacial states is crucial for efficient electrocatalysis.
- Surface vacancy engineering can significantly enhance catalytic activity and selectivity.
- This approach offers a pathway to improved green ammonia production and pollution remediation.
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