Abstract
This study presents the synthesis and electrochemical evaluation of a NiO-SnO2 nanocomposite as an advanced catalyst for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR) in an alkaline medium. The NiO-SnO2 composite, prepared via hydrothermal synthesis and subsequent annealing at different temperatures (400°C, 500°C, 600°C), demonstrated excellent catalytic performance, and attributed to its unique dual-phase structure comprising monoclinic NiO and tetragonal SnO2. XRD, SEM, and XPS analyses confirmed the material's crystallinity, morphology, and chemical states, highlighting the role of annealing temperature in optimizing structural properties. Electrochemical measurements revealed that the composite annealed at 600°C exhibited superior OER and UOR activities, with overpotentials of 320mV and 140mV, respectively, at a current density of 10mAcm⁻². This enhanced performance is attributed to the synergistic effects between NiO and SnO2, which improve electron transport, active site availability, and catalyst stability. The study underscores the potential of NiO-SnO2 composites for energy-efficient water splitting and urea-rich wastewater treatment.
Published Version
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