Direct Electrochemistry of Hemin on Graphdiyne Modified Carbon Ionic Liquid Electrode and Electrocatalysis to Bromate

In this paper an electrochemical sensor was fabricated by dropping a graphdiyne (GDY) and hemin suspension solution on the surface of carbon ionic liquid electrode (CILE) followed by casting the Nafion film (Nafion/hemin-GDY/CILE). The morphology of GDY was observed by scanning electron microscopy with the biomolecular structure of hemin-GDY and hemin characterized by UV- Vis absorption spectrophotometry, which proved that hemin maintained the original structure after mixing with GDY. Direct electrochemistry of hemin on the GDY modified electrode was realized with a pair of well-defined redox peaks and electrochemical performances were checked in detail with the electrochemical parameters calculated. Nafion/hemin-GDY/CILE showed excellent electrocatalytic ability towards the reduction of bromate with the detection range from 5.00 to 50.0 mmol L-1 and the detection limit of 3.3 mmol L-1 (3 sigma). In addition, the modified electrode possessed good reproducibility and stability, which was applied to the analysis of seawater samples.