Abstract
This work describes the development of an alternative acetate bath for the electrochemical codeposition of Ni-Cu-Fe electrodes at low pH that is stable for several weeks and produces electrodes with good performance for chlor-alkali electrolysis. Physical characterization of the electrode surface was made using X ray absorption spectroscopy (XAS), scanning electron microscopy (SEM) and energy dispersive analysis (EDX). The evaluation of the material as electrocatalyst for the hydrogen evolution reaction (her) was carried out in brine solution (160 g L-1 NaCl + 150 g L-1 NaOH) at different temperatures through steady-state polarization curves. The Ni-Cu-Fe electrodes obtained with this bath have shown low overpotentials for the her, around 0.150 V at 353 K, and good stability under continuous long-term operation for 260 hours. One positive aspect of this cathode is that the polarization behavior of the material shows only one Tafel slope over the temperature range of 298 - 353 K.
Highlights
Hydrogen is one of the most promising energy carriers that can be an alternative to fossil fuels
There is no doubt that the electricity cost is the largest factor contributing to the cost of the electrolytic production of hydrogen, and it varies with the cell voltage
The comparison of the electrochemical behavior of the electrode materials obtained with the baths at pH 3.2 and 5.2 showed that the overpotential at a current density of 210 mA cm-2 for the first electrode was ~ 40 mV above the value obtained for the second one
Summary
Hydrogen is one of the most promising energy carriers that can be an alternative to fossil fuels. It is known that the electrocatalytic activity for the her on metal and alloy electrodes is closely related to their surface and/or electronic properties[8].
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