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Abstract
In this study, a ZnCo2O4@Co3O4 composite material with a core–shell structure was synthesized using a hydrothermal method followed by calcination, and its electrocatalytic performance for overall water splitting was systematically investigated. The composite material, consisting of Co3O4 nanowires grown on ZnCo2O4 nanosheets, exhibited an enhanced surface area and improved electron transfer pathways, which significantly increased the number of active sites. For the hydrogen evolution reaction (HER), the composite displayed a low overpotential of 181.5 mV and a favorable Tafel slope of 146.37 mV dec−1. For the oxygen evolution reaction (OER), it demonstrated an overpotential as low as 169.3 mV with a Tafel slope of 78.5 mV dec−1. Furthermore, the ZnCo2O4@Co3O4 composite exhibited excellent stability, retaining 83% of its initial current density after 12 hours of continuous operation. These results suggest that the ZnCo2O4@Co3O4 composite is a promising and efficient catalyst for overall water splitting, offering a cost-effective solution for sustainable hydrogen production.
Published Version
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