Fig. 5. CVs of the (a) CCE, (b) ErN-GO/CCE, (c) Ni/CCE, (d) Ni/ErN-GO/CCE, (e) NiCo/CCE, (f) NiCo/ErGO/CCE and (g) NiCo/ErN-GO/CCE in 0.1 M KOH solution at 50 mV s−1. Inset is the CVs of (a) CCE and (b) ErN-GO/CCE in different scale.
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