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图3 Cu和Cu/rGO块体的Tafel曲线以及Cu/rGO块体在3.5%NaCl水溶液中电蚀刻3 d的示意图

Fig.3 Tafel plot of Cu and Cu/rGO bulks, respectively (a, b) and schematic diagram of Cu/rGO bulk etched electrochemically in 3.5%NaCl aqueous solution before and after 3 d (c, d)