Direct Ink Writing of 3D-Structured All-Carbon Electrodes with High Electrical Conductivity for (Vanadium) Redox Flow...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Redox flow batteries (RFBs) offer scalable energy storage but require improved components for commercial viability.
• Electrode materials are critical for electrolyte flow and electrochemical performance in RFBs.
• Direct ink writing (DIW) technology enables precise engineering of electrode architecture and composition.

Purpose of the Study:

• To develop novel 3D electrode materials for RFBs using DIW technology.
• To optimize electrode formulation for enhanced conductivity and mechanical stability.
• To evaluate the performance of DIW-fabricated electrodes in an all-vanadium RFB.

Main Methods:

• Formulation of electrode inks using graphite, multiwall carbon nanotubes, and polyacrylonitrile (PAN)-based carbon fibers.
• Utilizing a graphitizable binder for electrode consolidation.
• Employing direct ink writing to create complex 3D electrode structures.
• Heat treatment at 800 °C to achieve high conductivity and mechanical resistance.
• Testing electrodes in an all-vanadium redox flow cell.

Main Results:

• Successfully fabricated 3D carbon electrodes with high electrical conductivity (3000-8000 S/m) and mechanical strength.
• Achieved competitive electrochemical performance in an all-vanadium redox flow cell compared to benchmark graphite felt electrodes.
• Demonstrated the efficacy of DIW technology in tailoring electrode properties for RFB applications.

Conclusions:

• Direct ink writing is a promising technology for fabricating high-performance electrodes for redox flow batteries.
• The developed carbon electrodes show potential for advancing large-scale energy storage systems.
• Further research into DIW-engineered electrodes can lead to more efficient and cost-effective RFBs.