Graphene Quantum dots used to make high performance supercapacitors

Researchers from China's Beijing Institute of Technology developed new supercapacitors based on electrodes made from graphene quantum dot (GQD) assemblies on horizontally aligned carbon nanotubes (HACNTs). They say that adding the GQD results in more than 200% capacitance improvement compared to bare HACNT electrodes.

To fabricate these devices, the researcher synthesized super-long vertically aligned CNTs (VACNT) (using water-assisted CVD) and then transformed hem into HACNTs using a roller. The GQD were uniformly anchored on the HACNTs using an electrochemical deposition process. The composite film that was producing in this method was assembled in a symmetrical two-electrode configuration.