Sultan Alhayyani

تخصص تحول الطاقة · دفعة 2026

Electrochemical Evaluation of Self-Supported NiFe-LDH Electrocatalysts for Alkaline Urea Oxidation

This project evaluates self-supported NiFe-LDH electrocatalysts grown directly on nickel foam and iron mesh for the urea oxidation reaction (UOR) under alkaline conditions. Bare nickel foam and NiFe-LDH-modified electrodes were tested in 1 M KOH, with and without 0.33 M urea, using cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy. The electrodes were compared in terms of current-density response, iR-corrected polarization behaviour, apparent Tafel kinetics, cycling response, and charge-transfer characteristics to assess the effects of catalyst deposition, substrate type, and electrolyte composition on anodic performance. The results show that the addition of urea markedly changes the electrochemical response, with UOR predominating at relatively low anodic potentials before the oxygen evolution reaction becomes increasingly competitive at higher potentials. Overall, the study identifies the most promising electrode configuration among those tested and provides a comparative basis for developing urea-assisted electrolysis systems that could lower the anodic energy requirement for hydrogen production while offering a potential route for the electrochemical treatment of urea-containing streams.

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