The rapid development of technology in the last few decades has increased the energy demand in the world. Meanwhile, the massive consumption of oil and gas resources has caused severe environmental problems. Therefore, there is an urgent need to provide highlyefficient energy storage and conversion systems from new sustainable energy resource alternatives. Among different electrical energy storage technologies, the zinc-air battery is a promising candidate as a sustainable energy storage device, due to the advantages of low cost, safety, and high specific energy density– about 2–10 folds higher than that of lithium-ion batteries [1]. The architecture of zinc-air batteries is similar to the traditional batteries in which a metal plate has used as the negative electrode. On the other side, they also have similarities to conventional fuel cells due to the employment of a porous positive electrode structure as the air catalyst which accelerates the sluggish oxygen electrocatalysis [2]. Thus, there is a huge demand to explore low-cost electrocatalysts with efficient properties. In recent years, metal hydroxides, chalcogenides, phosphides, selenides, and sulfides have gained significant importance due to their unique performance and abundance on the surface of the earth [3]. The aim of this research is to synthesis cobalt sulfide nanowires as a proposing electrode material for oxygen electrocatalysis. Co3S4 nanowires was synthesized in two steps; first, the Co(CO3)0.35Cl0.20(OH)1.10 intermediate was synthesized from cobalt chloride and urea precursors by hydrothermal method at 100 °C for 12 h. In the next step, Co3S4 nanowires were prepared with thioacetamide in a hydrothermal reaction media at 200 °C for 12 hours [4]. The morphology of the sample was characterized by a field-emission scanning electron microscope (FE-SEM). The chemical structure was characterized by Fourier-transform infrared (FT-IR) and X-ray energy dispersive (EDX) spectroscopies. The crystal planes of
