A sustainable approach for graphene paste could enable microsupercapacitors and multipurpose flexible electronics

Researchers from Italy's Sapienza University of Rome, Portugal's International Iberian Nanotechnology Laboratory (INL), University of Minho and Universidade de Lisboa have developed a sustainable approach to produce an electrically conductive, graphene-based paste suitable for fabricating flexible devices such as microsupercapacitors (mSCs).

The new method enables the scalable, cost-effective, and environmentally friendly production of high-quality graphene materials, paving the way for advanced applications in energy storage and flexible electronics.


The approach is based on the exfoliation of graphite in water by using high-shear mixing and high-pressure airless spray techniques, which are carefully optimized to obtain highly concentrated and stable dispersions of graphene. The graphene materials are then combined with carbon black and a natural binder to form an eco-friendly composite paste that can be used to fabricate fully flexible and high-performance microsupercapacitors.

The resulting microsupercapacitors reportedly demonstrate very high capacitance and energy density, providing exceptional coulombic efficiency and cyclability (~99% after 10,000 cycles), mechanical flexibility, and the possibility of serial/parallel integration without metal-based interconnects for high-voltage and high-capacitance outputs. As a result, these lightweight and versatile devices have enormous potential for electronic applications.

The researchers have developed a one-kind-fits-all paste for innovative electronic devices that can be fabricated by low-cost techniques such as blade coating and screen printing, making a significant step towards commercial production. The versatility and broad application potential of this nanocarbon-based paste have been demonstrated by the researchers, who fabricated an array of diverse devices, including efficient electromagnetic interference shielding coatings and reliable wearable strain sensors integrated in textiles.

Posted: May 28,2024 by Roni Peleg