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Electrochemical direct air capture by local alkalinity generation at three-dimensional interfaces
Anmol Mathur1, Zhengyuan Li1, Aochunqiu Han1
1Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA.
Nature Communications
|June 26, 2026
Summary
This study introduces an improved electrochemical direct air capture (eDAC) system for efficient carbon dioxide (CO2) removal. The innovative design enhances CO2 capture rates and stability, paving the way for scalable climate solutions.
Area of Science:
- Environmental Science
- Electrochemistry
- Materials Science
Background:
- Electrochemical direct air capture (eDAC) offers potential for carbon dioxide removal but faces challenges.
- Existing eDAC systems suffer from low capture rates, high regeneration energy, and poor stability.
- Scalability and efficiency remain critical hurdles for widespread eDAC deployment.
Purpose of the Study:
- To develop a robust eDAC platform addressing limitations of current systems.
- To enhance CO2 absorption kinetics and energy efficiency in eDAC.
- To demonstrate stable and scalable operation of a novel eDAC architecture.
Main Methods:
- Local hydroxide generation at the air-electrode interface for improved CO2 absorption.
- Proton-coupled electron transfer mediator for low-energy CO2 release and high-purity gas.
- 3D porous interposer to expand the reactive interface and boost capture efficiency.
- Pulsed current protocol for optimized system performance.
Main Results:
- Achieved stable operation exceeding 50 hours at significantly higher current densities.
- Demonstrated competitive energy consumption compared to existing eDAC technologies.
- Validated system performance through multiphysics modeling and techno-economic analysis.
Conclusions:
- The novel eDAC platform overcomes key limitations in capture rate, regeneration energy, and stability.
- Architectural innovations, including local hydroxide generation and a 3D interposer, are crucial for eDAC efficiency.
- The study presents a viable pathway toward cost-effective and scalable carbon dioxide removal using eDAC technology.
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