Abstract
In this work, we have obtained spinel-type nickel-cobalt oxide nanostructures on low-cost and easy-handling AISI304-type stainless steel substrate via simple potentiostatic electrodeposition. Nickel and cobalt hydroxide layers were formed by varying the deposition potential at the same time intervals (− 1.15 V for Ni(OH)2 and − 0.85 V for Co(OH)2). An electrolyte bath containing 0.05 M Ni(NO3)2, 0.05 M Co(NO3)2, and 0.1 M KNO3 was used for the electrodeposition. Structural analysis confirmed the formation of a spinel NiCo2O4 after thermal treatment. The influence of annealing temperature in the range of 473–1073 K on the films activity in OER has been investigated using 0.1 M NaOH. Nickel-cobalt oxide coatings demonstrated OER activity close to the benchmark IrO2 with the onset potential value of + 1.6 (vs. RHE), overpotential of 530 mV at 10 mA cm−2, and Tafel slope of 49 mV dec−1. Meanwhile, the electrocatalytic activity of separate Co3O4 and NiO is far smaller.
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