Electron transfer rate and electrocatalytic performance of ionic liquid/graphene quantum dots nanocomposite modified electrode

Graphene is a new class of 2D carbon nanomaterials with one atom thickness. Graphene quantum dots (GQDs), are graphene sheets that are smaller than 100 nm and has been emergedas a significant research area in recent years (1). Recently some organic and inorganic materialshave been utilized for the stabilization of GQDs on the electrodes surface for sensing and biosensing purposes (2). In this study 1-butyl-3-methylimidazolium hexafluorophosphate wasused as an ionic liquid (IL) for the stabilization of GQDs on the electrode surface. The resulted ILs/GQDs modified electrode was studied with cyclic voltammetry and electrochemical impedance spectroscopy (EIS) techniques. The electron transfer rate and electrocatalyticperformance of the prepared electrode was compared with GQDs and ILs modified electrodes. The results was shown that the ILs/GQDs modified electrode have better electron transfer rate and electrocatalytic performance than GQDs and ILs modified electrodes. Due to the uniqueelectron transfer ability of ILs and GQDs, and also stability of the fabricated ILs/GQDs modified electrodes, it can be used in various electroanalytical purposes.

Keywords:

Graphene quantum dots , Ionic liquids , modified electrode