Using a mixed solution of 0.1 mol•L-1 H2SO4 and 0.5 mol•L-1 Na2SO4 with a pH of 6.51 as the supporting electrolyte, add 4 mL of the supporting electrolyte to the reaction system, and then sweep at a rate of 10~200 mV•s-1 Cyclic voltammetry scan within the range, superimposing cyclic voltammetry graphs at different scan speeds (Figure 7)
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