Abstract
<p class="PaperAbstract"><span lang="EN-US">The present work investigates the efficiency of an alkaline water electrolysis process in the presence of a complexing agent like citric acid (CA) when added directly into the electrolyte during the electrolytic process. High surface area nickel electrodes prepared by electrodeposition technique were used as the electrode to evaluate the efficiency of the oxygen evolution reaction (OER) by the polarization measurements and cyclic voltammetry. The quantity of the complexing agent CA in the electrolyte was varied from 0-1 wt. %. An increase in the current density of about 25% resulted at a temperature of 30 °C in the presence of 0.2 wt. % of CA at 1.0 V </span><span lang="EN-US">vs.</span><span lang="EN-US"> Hg/HgO. CA was found to improve performance by forming a complex with the alloy electrode and by formation of the high surface area catalyst for efficient OER.</span></p>
Highlights
Clean energy is considered as the solution to world’s increasing energy demand and to concerns regarding pollution and contamination
The results presented help in concluding that a deposit formed in-situ during the electrolytic process by using a complexing agent such as citric acid (CA) in the electrolytic solution is extremely active
An increase in the current density of about 25 % resulted at a temperature of 30 °C in the presence of 0.2 wt. % of CA at 1.0 V vs. Hg/HgO
Summary
Clean energy is considered as the solution to world’s increasing energy demand and to concerns regarding pollution and contamination. Nikolić et al [14] have shown that alkaline electrolytic hydrogen production can be made efficient (~15 %) by the addition of activating compounds of tungsten and cobalt in the ionic and complex form into the electrolyte (6 M KOH) during electrolytic process. The effect of ionic activators and complexes in alkaline water electrolysis has been emphasized by improved performance in the presence of molybdate, chromate and cobalt based compounds [15,16]. It was decided to study the effect of this stabilizer during the electrolysis of water by adding it to the electrolyte, i.e. to study whether the Ni citrate complex formed will act similar to the ionic activator and improve the efficiency of the electrolytic process. A systematic study on OER has been carried out by varying the concentration of citric acid in the electrolyte between 0 and 1 % by weight
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