The anodic peak current (ipa) are lin-early proportional to the scan rate from 10 to 200 mV s−1(Fig. 3B),indicating that the oxidation process of glucose on the Pt0.7Co0.3/Celectrode is a surface-controlled process. It is believed that at thescan rate used, the reaction kinetics is so fast that the process is stillsurface-controlled.