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In order to advance sustainable energy technologies like fuel cells and metal-air batteries, it is crucial to use an electrocatalyst that is very efficient for the process of oxygen evolution. The production of Co3O4 nanostructures led to the creation of a multiporous nanostructure. The research used an approach that utilised a simple, cost-effective, and low-temperature synthesis procedure. The catalytic activity of Co3O4 nanostructures, which have a high degree of porosity and include mesoporous nanostructures, was shown to be substantial. The catalyst has the ability to enhance the highly reactive oxygen reactions at the anode, hence increasing the combined effect of charge transfer at the interface and the porous structure of Co3O4 nanostructures. The results of this study demonstrate that Co3O4 nanostructures exhibit a significant overpotential value of 321 mV at 10 mA/cm2, a Tafel slope of 72 mV Dec−1, and excellent stability when used as electrocatalysts for the oxygen evolution process (OER) in real-world situations. [ABSTRACT FROM AUTHOR]