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Updated: Aug 10, 2025
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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
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Coupling nitrate capture with ammonia production through bifunctional redox-electrodes.
Kwiyong Kim1,2, Alexandra Zagalskaya3,4, Jing Lian Ng1
1Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA.
Nature Communications
|February 14, 2023
Summary
This study introduces bifunctional electrodes for converting pollutant nitrate into valuable ammonia. These electrodes enhance nitrate capture and conversion efficiency, offering a sustainable solution for water remediation and energy production.
Area of Science:
- Environmental chemistry
- Electrocatalysis
- Materials science
Background:
- Nitrate is a widespread water pollutant from agriculture and industry.
- Converting nitrate to ammonia offers a sustainable pathway for energy and chemical feedstock production.
- Mass transport limitations hinder efficient nitrate-to-ammonia conversion in dilute water streams.
Purpose of the Study:
- To develop bifunctional electrodes for efficient nitrate-to-ammonium conversion.
- To overcome mass transport limitations in dilute nitrate solutions.
- To provide a fully electrified reaction-separation pathway for nitrate remediation and ammonia production.
Main Methods:
- Development of bifunctional electrodes coupling a nitrate-selective redox-electrosorbent (polyaniline) with an electrocatalyst (cobalt oxide).
- Electrochemical control for synergistic reactive separation of nitrate.
- Utilizing electronic structure calculations and spectroscopic measurements to understand nitrate selectivity.
- Testing electrodes with agricultural tile drainage water.
Main Results:
- Achieved electrochemically-reversible nitrate uptake greater than 70 mg/g.
- Demonstrated 8-fold up-concentration of nitrate from dilute agricultural water.
- Observed a 24-fold enhancement in ammonium production rate (108.1 ug h⁻¹ cm⁻²).
- Achieved >10-fold enhancement in energy efficiency compared to direct electrocatalysis.
Conclusions:
- Bifunctional electrodes effectively couple nitrate capture and conversion.
- The developed strategy enables efficient, electrified nitrate remediation and ammonia production.
- This approach offers a modular solution for coupled environmental and energy challenges.
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