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Updated: Apr 22, 2026

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
Interfacial Charge-Regulated Microenvironments Enabled by Ionic Organic Cages for Boosting Electrocatalytic Nitrate
Shuyuan Li1,2, Jun-Hao Zhou1, Shi-Long Han1
1MOE Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, China.
Researchers developed new electrocatalysts using palladium clusters within charged organic cages for sustainable ammonia synthesis. These catalysts efficiently convert nitrate to ammonia, also aiding in water purification by removing nitrate pollution.
Area of Science:
- Electrochemistry
- Materials Science
- Supramolecular Chemistry
Background:
- The Haber-Bosch process for ammonia synthesis is energy-intensive and produces significant carbon emissions.
- Electrochemical nitrate reduction reaction (NO3RR) presents a sustainable alternative for ammonia production and water remediation.
- Current NO3RR catalysts face challenges including poor nitrate adsorption, hydrogen evolution competition, and suboptimal microenvironments.
Purpose of the Study:
- To design and synthesize novel electrocatalysts for efficient and selective electrochemical nitrate reduction reaction (NO3RR).
- To investigate the role of catalyst microenvironment and charge density in enhancing NO3RR performance.
- To demonstrate the application of these catalysts in both ammonia synthesis and nitrate removal from water.
Main Methods:
- Synthesis of palladium clusters encapsulated within quaternized organic cages (Pd⊂QA-Cage^x+).
- Electrochemical characterization of catalysts, including cyclic voltammetry and chronoamperometry.
- Evaluation of ammonia yield, Faradaic efficiency, and nitrate removal efficiency in neutral electrolytes.
Main Results:
- Pd⊂QA-Cage^x+ electrocatalysts demonstrated tunable performance based on cage charge density.
- The optimized Pd⊂QA-Cage^24+ achieved a high Faradaic efficiency of 95.44% and ammonia yield of 25.70 mg h^-1 mg_cat^-1.
- Catalysts effectively removed >99.4% of nitrate from eutrophic seawater, meeting potable water standards.
Conclusions:
- Quaternized organic cages serve as effective platforms for confining metal clusters and precisely controlling the interfacial microenvironment.
- Increasing cage charge density enhances nitrate activation and intermediate hydrogenation, boosting NO3RR performance.
- This supramolecular strategy offers a promising approach for developing advanced electrocatalysts for sustainable ammonia synthesis and environmental remediation.
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