Scalable and efficient separation of hydrogen isotopes using graphene-based electrochemical pumping

Area of Science:

• Materials Science
• Chemical Engineering
• Nuclear Engineering

Background:

• Current heavy water production and tritium decontamination are energy-intensive and costly.
• Graphene has shown potential for electrochemical sieving of hydrogen isotopes.

Purpose of the Study:

• To develop a scalable and energy-efficient method for hydrogen isotope separation using graphene.
• To evaluate the proton-deuteron separation factor and energy consumption of the proposed graphene-based technology.

Main Methods:

• Utilizing graphene produced via chemical vapour deposition (CVD) for isotope separation.
• Employing an electrochemical pumping method to drive hydrogen isotopes through graphene membranes.
• Characterizing the separation factor and projecting energy efficiency.

Main Results:

• Achieved a proton-deuteron separation factor of approximately 8, even with imperfect graphene membranes.
• Projected energy consumption is orders of magnitude lower than existing technologies.
• A 30 m² graphene membrane could match the output of modern heavy water plants.

Conclusions:

• Scalable graphene-based membranes offer a simple, efficient, and green alternative for hydrogen isotope separation.
• The technology has significant potential for reducing the footprint of nuclear and related industries.
• Further development could enhance efficiency for tritium separation.