Abstract
Hydrogen is an environmentally friendly energy source that can be extracted from water through electrolysis. However, the slow oxygen evolution reaction (OER) at the anode side is the main obstacle to the widespread use of water-splitting devices. This study used self-developed highly porous nickel structures (SMNF) and commercial nickel foam (CNF) as working electrodes in the electrolysis process. Iron (II, III) Oxide (Fe3O4) as a catalyst is coated with a dip coating technique on the Ni porous structure and then calcined using a laser process to produce a Ni-Fe3O4-based electrode. Electrochemical test results show that the presence of Fe3O4 significantly impacts high reaction kinetics. The SMNF-Fe3O4 demonstrated an overpotential of 217,3 mV at 1 M KOH electrolyte, at a current density of 10 mA, lower to SMNF electrode without Fe3O4 with an overpotential of 361,4 mV under the same conditions. In addition, the difference in porosity less significantly affects the electrode's effectiveness due to the slight difference in mass loading, which is only < 5 mg. However, electro-impedance spectroscopy (EIS) testing shows better performance on SMNF-Fe3O4 with a smaller electrical series resistance (ESR), around 0.638 Ω, compared to CNF-Fe3O4, which is 0.767 Ω. Overall, observations by chronoamperometry test at an overpotential of 155 mV at 5 hrs show stable performance of SMNF-Fe3O4 electrodes.
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