Perspective and challenges in electrochemical approaches for reactive CO₂ separations

Area of Science:

• Electrochemistry
• Materials Science
• Environmental Science
• Computational Chemistry

Background:

• Growing demand for decarbonization and renewable energy drives research into novel CO2 separation techniques.
• Conventional thermal and pressure swing processes for CO2 capture are energy-intensive, costly, and reliant on fossil fuels.
• Electrochemical CO2 capture presents a sustainable alternative, supporting negative emissions technologies with potential for modularity and integration.

Purpose of the Study:

• To review recent advancements in electrochemical CO2 capture technologies over the past decade.
• To highlight progress in electrolytes and electrodes featuring redox-active moieties for reversible CO2 capture and transport.
• To discuss the role of computational chemistry in discovering new materials for electrochemical CO2 separation.

Main Methods:

• Review of literature on electrolytes and electrodes with redox-active moieties for CO2 capture.
• Analysis of electrochemical approaches, including direct air capture (DAC) utilizing electricity.
• Discussion of computational chemistry's contribution to materials discovery for CO2 separation.

Main Results:

• Significant progress has been made in developing electrolytes and electrodes with redox-active moieties for efficient CO2 capture.
• Electrochemical methods offer advantages such as modularity, smaller footprints, mild operating conditions, and integration potential.
• Computational chemistry plays a crucial role in identifying and designing novel heterogeneous electrode materials and redox carriers.

Conclusions:

• Electrochemical CO2 capture, particularly DAC, is a promising technology for achieving negative emissions, contingent on renewable electricity availability.
• Continued research into advanced electrolytes and electrodes is essential for optimizing CO2 capture efficiency and scalability.
• The synergy between experimental studies and computational chemistry will accelerate the development of next-generation CO2 separation materials.