Comparative studies of recent advances in quantum dots nanocomposites for supercapacitor electrodes
Ghobad Behzadi Pour, Leila Fekri Aval
Abstract
• The review includes a comparative study on electrochemical characteristics of QDs electrodes. • Recent advances in CQDs and GQDs synthesizing and novel nanocomposites have been reported. • QDs-based supercapacitors exhibited a power density below 1500 W kg −1 . • The energy density of most QDs supercapacitors is under 150 Wh kg −1 . Novel material innovation is a driving force for advancing high-performance electrochemical energy storage technologies. Quantum dots (QDs), over the last decade, have exhibited immense potential in applications related to bioimaging, optoelectronics, catalysis, and energy storage, together with a remarkable rise in greener synthesis methods. Carbon nanomaterials, particularly carbon quantum dots (CQDs) and graphene quantum dots (GQDs), have garnered significant interest due to their exceptional characteristics, including high electrical conductivity, thermal stability, mechanical robustness, chemical durability, photoluminescence, affordability, and ease of surface modification. CQDs show promise for supercapacitors due to their unique properties but face challenges like limited surface area. Improving CQD synthesis and purification is crucial for enhancing supercapacitor performance. GQDs are praised for their conductive networks and surface properties, but more research is needed on industrial-scale synthesis. This review reported the recent advances in the electrochemical characteristics and synthesis of various QDs in supercapacitor electrodes.