▎ 摘　　要

We developed a novel iron-tetrasulfophthalocyanine-graphene-Nafion (FeTSPc-GR-Nafion) modified screen-printed electrode to determine hydrogen peroxide (H2O2) with high sensitivity and selectivity. The nanocomposite film (FeTSPc-GR-Nafion) exhibits an excellent electrocatalytic activity towards oxidation of H2O2 at a potential of +0.35 V in the absence of enzyme. A comparative study reveals that the FeTSPc-GR complexes play a dual amplification role. Amperometric experiment indicates that the sensors possess good sensitivity and selectivity, with a linear range from 2.0X10-7 M to 5.0X10-3 M and a detection limit of 8.0X10-8 M. This sensor has been successfully used to develop the glucose biosensor and has also been applied to determine H2O2 in sterile water.