▎ 摘　　要

In this study, the electrochemical reduction process of GO was investigated with structural and electrochemical analysis on a series of step-reduced ERGOs. Firstly, the disorder of ERGO decreased and its electron conductivity increased significantly at the initial reduction period, from 0 to -0.5V, together with the desorption of hydroxyl and the formation of carboxyl. Then OCOH was completely reduced to CO at the potential between -1.0V and -1.4V. Finally, reduction of CO was observed from -1.6V to -1.8V. On the other hand, the step-reduced ERGO with gradually varying surficial electrochemical properties gave the opportunity for the analysis of a given redox system. The [Fe(CN)(6)](3-/4-) redox reaction was sensitive to the conductivity of modified ERGOs, but insensitive to the oxy-functional groups. Oppositely, the Q/HQ redox reaction was mainly effected by the quantity of carboxyl. The oxidation of AA was affected by both the conductivity and oxy-functional groups. Otherwise, electrostatic interaction was exhibited between reactant and ERGOs for all these three reactions.