Abstract: A modified glassy carbon electrode was fabricated based on graphene/ionic liquid/chitosan-hemeglobin composite film modification.The direct electrochemical behavior of hemoglobin at the modified electrode was investigated by cyclic voltametry.The experimental results showed that hemeglobin has good electrocatalytic activity for hydrogen peroxide on the nanocomposite modified electrode.The linear range of H2O2 was 0.1~500 μmol/L.The limit of detection was 0.02 μmol/L(RSN=3).The electrochemical se...