Abstract
In this study, nickel cobalt oxide (NiCo2O4) microspheres were prepared by using facile hydrothermal route. The structural confirmation of bimetal oxide formation was acquired by X-ray powder diffraction and Raman studies. The formation of microspheres combined via irregular nanosheets was confirmed by scanning electron microscopy. Highly oriented NiCo2O4 microspheres yielded a high current density (258 mA/g) at 10 mV/s and low overpotential (224 V). The highly active electrode showed efficient electron transportation towards oxygen evolution reaction. Long-term stability over 16 h was achieved by the fabricated high-performance NiCo2O4 electrode. It is recommended that NiCo2O4 microspheres obtained from 3:1 stoichiometry ratio of Ni and Co would lead to new electrocatalysts that give best performance than expensive catalysts used currently in the water oxidation process.
•NiCo2O4 is synthesized by hydrothermal with different ratios of Ni:Co.•NiCo2O4 yields high 258 mA/g current density at 10 mV/s.•NiCo2O4 revealed low 224 V overpotential.•NiCo2O4 showed efficient electron transportation towards oxygen evolution.•Long time stability over 16 h has been achieved.