We carried out an electrochemical study about zinc electrodeposition onto GCE and HOPG substrates from an electrolytic plating bath containing 0.01M ZnSO 4 + 1M (NH 4 ) 2 SO 4 at pH 7. Under our experimental conditions the predominant chemical species was the complex [ZnSO 4 (H 2 O) 5 ]. The chronoamperometric study showed that zinc electrodeposition follows a typical 3D nucleation mechanism in both substrates. The average ΔG calculated for the stable nucleus formation was 6.92 x 10 -21 J nuclei −1 and 1.35 x 10 -20 J nuclei −1 for GCE and HOPG, respectively. The scanning electron microscopy (SEM) images showed different nucleation and growth processes on GCE and HOPG substrates at same overpotential.
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