It also can be seen that the peak currents at OMC/GCE increase significantly, which may be attributed to the unique advantages of OMC that are advantageous to efficient diffusion and adsorption of reactants and the transportation of electrons. Moreover, the reduction peak at 0.67 V increase more greatly, and the potential decreased compared with GCE, showing that OMC film possessed catalytic properties towards FA. Therefore, the following work was focused mainly on the irreversible reduction peak c1 with its high sensitivity.