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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
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A Membraneless Electrochemically Mediated Amine Regeneration for Carbon Capture
Ahmad Hassan1, Mohsen Afshari1, Mim Rahimi2,3
1Department of Civil and Environmental Engineering, University of Houston, Houston, TX, 77204, USA.
Nature Communications
|July 9, 2025
Summary
A new membraneless electrochemical carbon capture system (EMAR) eliminates costly membranes. This innovation significantly reduces the cost and complexity of carbon dioxide removal, paving the way for scalable solutions.
Area of Science:
- Chemical Engineering
- Electrochemistry
- Carbon Capture Technologies
Background:
- Electrochemical carbon capture (ECC) offers scalable alternatives to traditional thermal methods.
- Electrochemically mediated amine regeneration (EMAR) is a promising ECC technology but is hindered by costly and fragile ion-selective membranes.
- Existing EMAR systems require complex configurations with multiple components, increasing operational challenges and cost.
Purpose of the Study:
- To develop and evaluate a novel membraneless electrochemically mediated amine regeneration (EMAR) system.
- To eliminate the need for ion-selective membranes and associated equipment in EMAR processes.
- To assess the performance and economic viability of the proposed membraneless EMAR system.
Main Methods:
- A redesigned EMAR process configuration utilizing gas diffusion electrodes (GDEs) as both anode and cathode.
- Comparison of two GDE configurations: mesh-attached and electrodeposited.
- Evaluation of CO2 removal efficiency, current density, and energy consumption.
- Techno-economic analysis to estimate the levelized cost of CO2 capture.
Main Results:
- The membraneless EMAR system achieved CO2 removal efficiencies exceeding 90% with electrodeposited GDEs.
- Energy consumption was as low as 60 kJ/mol CO2.
- Estimated levelized cost of capture is ~$70/tonne CO2, significantly lower than conventional EMAR ($137/tonne CO2).
Conclusions:
- The membraneless EMAR system offers a simplified, cost-effective, and scalable approach to carbon capture.
- Eliminating membranes and associated equipment drastically reduces process footprint and cost.
- Further optimization could lead to capture costs below $50/tonne CO2, enhancing its potential for industrial application.
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