Abstract
In this study, a novel NiO/Co3O4/KNbO3 heterostructured electrocatalyst with NiO and Co3O4 particles coupled on KNbO3 cubes was constructed using simple sol–gel and calcination processes. The formation of multiple interfaces between NiO, Co3O4, and KNbO3 in the heterostructure contributed to a synergistic effect, adjusted the electronic structure, and generated abundant active sites at the interfaces. As a result, the NiO/Co3O4/KNbO3 electrocatalyst exhibited remarkable urea electrolysis performance, including a low potential of 1.67 V at 100 mA cm−2 and a small Tafel slope of 29 mV dec−1. Furthermore, the change in the overpotential was negligible even after a rigorous stability test of 3000 cycles, highlighting its exceptional durability and reliability. This study provides a novel structural engineering strategy for achieving efficient hydrogen production and purification from urea-containing wastewater.
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