Low-cost fabrication of graphene ball electrodes for the amperometric detection of capillary electrophoresis

► Graphene-coated anion exchange resin microspheres were prepared. ► The coating exhibited a compact layer-by-layer stacking of graphene sheets. ► The graphene-wrapped microspheres were embedded in pipette tips to form electrodes. ► The electrodes were applied in the detection of capillary electrophoresis.