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Fig. 3. EDX spectra of (a) CCE, (b) ErN-GO/CCE, (c) Ni/CCE, (d) Ni/ErN-GO/CCE, (e) NiCo/CCE and (f) NiCo/ErN-GO/CCE. Insets are the surface chemical composition of the same electrodes. Elemental maps of Ni atoms in Ni/ErN-GO/CCE (d′) and Co atoms (f′), Ni atoms (f′′) and Ni, Co atoms (f′′′) in NiCo/ErN-GO/CCE.