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Updated: Jun 9, 2026

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
Entropy-Engineered Catalysts for Electrochemical Nitrate Reduction to Ammonia.
Aqsa Dildar1, Walija Maqsood2, Muhammad Ismail1
1Institute of Chemistry, Faculty of Chemical and Biological Sciences, The Islamia University of Bahawalpur, Bahawalpur, Pakistan.
Medium-entropy alloys (MEAs) and high-entropy alloys (HEAs) show great promise for nitrate reduction reaction (NO3RR) electrocatalysis. Their unique properties enable efficient and selective conversion of nitrate to ammonia, advancing sustainable nitrogen chemistry.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Medium-entropy alloys (MEAs) and high-entropy alloys (HEAs) are emerging as advanced electrocatalysts.
- Their compositional complexity and tunable electronic properties offer unique advantages for catalytic applications.
- These alloys provide diverse active sites, favorable adsorption energies, and enhanced stability for efficient nitrate reduction.
Purpose of the Study:
- To critically examine recent advances in MEA/HEA-based electrocatalysts for the nitrate reduction reaction (NO3RR).
- To detail synthetic strategies, phase behaviors, structure-property relationships, and mechanistic pathways of these catalysts.
- To highlight the advantages of entropy-driven design in electrocatalysis compared to traditional systems.
Main Methods:
- Review of synthetic strategies and characterization techniques for MEAs/HEAs.
- Analysis of mechanistic insights, including proton-coupled electron transfer and intermediate stabilization.
- Comparative assessment with monometallic and bimetallic catalysts.
- Exploration of operando characterization and density functional theory (DFT) modeling.
Main Results:
- MEAs and HEAs demonstrate efficient and selective multielectron nitrate reduction.
- Entropy-driven design offers significant advantages over conventional catalysts.
- Understanding of mechanistic pathways, including suppression of hydrogen evolution, is enhanced.
- Optimization of alloy microstructure and surface properties is crucial for performance.
Conclusions:
- MEAs and HEAs are positioned as next-generation electrocatalysts for sustainable nitrogen chemistry, particularly for green ammonia synthesis.
- Further research is needed to address challenges in atomic-scale surface control and long-term durability.
- Bridging fundamental alloy theory with practical applications is key to advancing entropy-engineered catalysts.
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