Electrochemical characterization of carbon paste electrodes modified with MgZnGa and ZnGaAl hydrotalcite-like compounds

Abstract

Two hydrotalcite-like compounds (HTs) were synthesized by coprecipitation. The electrochemical behavior of MgZnGa ([Mg 0.58 Zn 0.17 Ga 0.25 (OH) 2 ] (CO 3 ) 2− 0.125 1.5 H 2 O) and ZnGaAl ([Zn 0.75 Ga 0.19 Al 0.06 (OH) 2 ] (CO 3 ) 2− 0.125 ·1.5 H 2 O) Hydrotalcite-like compounds (HTs) was studied in NaOH at different concentrations. Voltammetric and chronoamperometric studies were performed to identify oxidation and reduction processes and the effect of the cations in total reactivity. Electrocatalytic effect of HTs on hydroxide electrochemical oxidation shows better performance of MgZnGa; this is apparently due to the presence of Mg and a greater amount of Ga 3+ in the lattice of this HT. As far as reduction is concerned, Zn(II) reduction process is observed within the lattices of both HTs and is influenced by both the amount of OH − in the solution and the potential which the previous oxidation has been performed.

Layered double hydroxide materials coated carbon electrode: New challenge to future electrochemical power devices

“…Particularly interesting is the anionic clays, especially hydrotalcite-like compounds (HTs), which are relatively easy to synthesize and have an environmentally friendly nature. HTs exhibit a broad versatility which allows their synthesis with different ions for specific applications [10,11], including degradation and adsorption of a wide variety of pollutants such as phenols, oxyanions and dyes [12][13][14]. Recently, Tonelli et al [15] and Mousty et al [16,17] have reviewed the HT materials as electrode modifiers to be used for both electrochemical detection (chemical sensors and biosensors) and energy-storage devices.…”

ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation

“…Metal cations in the layer have been supposed to enhance the charge transport of the catalyst. Electron hopping mixed mechanism along the layer is believed to be a reason for charge transport, which is ascribable to the inner redox reaction between oxidized and reduced forms of metal cations ( Aguilar-Vargas et al, 2013 ).…”

Fabrication of Ni‐Fe LDH/GF anode for enhanced Fe(III) regeneration in fuel cell‐assisted chelated‐iron dehydrosulfurization process

“…12 The ability of transition metal cations to undergo redox reactions at applied potentials enhances the charge transport within material, and the migration of anions inside the interlayers can compensate the extra charge during redox reactions. 13,14 In particular, nickel-iron (Ni-Fe) hydrotalcite, which is a very important member in the hydrotalcite family, has shown great potential as an electrochemical sensor, 15 electrochemical pseudocapacitor 16 and electrocatalyst. [15][16][17][18][19][20][21] In the present work, Ni-Fe LDH modified graphite felt (GF) was fabricated as the anode of an air-cathode fuel cell for the EDTA-chelated iron dehydrosulfurization process.…”

“…LDHs with transition metal cations on the layers, such as nickel‐ and cobalt‐containing LDHs, have been widely used in electrocatalytic reactions . The ability of transition metal cations to undergo redox reactions at applied potentials enhances the charge transport within material, and the migration of anions inside the interlayers can compensate the extra charge during redox reactions . In particular, nickel–iron (Ni‐Fe) hydrotalcite, which is a very important member in the hydrotalcite family, has shown great potential as an electrochemical sensor, electrochemical pseudocapacitor and electrocatalyst …”