The results are shown in Figure . As can be seen in this figure, based on the linear-Burk diagram, a Vmax as high as 67.56 nM min -1 was provided for the oxidase-like Ce/Fe-bimetallic nanozymes, revealing their high catalytic activity. Besides, the Km value was found to be about 0.067 mM, revealing the high affinity of the oxidase-like Ce/Fe-bimetallic nanozymes to TMB.