Abstract
Two lamellar double hydroxides were synthesized by co-precipitation. The electrochemical behavior of MgZnGa and ZnGaAl HTs was studied in two electrolytic media: 0.1 M NaOH and 0.1 M NaOH/ 0.05 M NaCl. Voltammetric and amperometric studies were performed to identify oxidation and reduction processes and the effect of Mg2+, Zn2+, Ga3+ and Al3+ cations in total reactivity. Electrocatalytic behavior of water oxidation by the two HTs shows better performance of MgZnGa HT; this is apparently due to the presence of a greater amount of Ga3+ in the network of this HT. Chloride adsorption at the surface of the electrode affects the currents obtained by using sodium-chloride containing electrolyte, with larger currents resulting from the use of ZnGaAl HT, probably due to the presence of Al3+ in the HT structure. As far as reduction is concerned, Zn2+ and Ga3+ reduction processes are observed within the networks of both HTs
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