Preparation Of Cuprous Oxide-based Nanocomposites And Their Application In Electrocatalysis

The cuprous oxide-based nanocomposites have unique physical and chemical properties,and have become one of the research hotspots in the field of materials.In this dissertation,two different synthesis methods have been used to obtain cuprous oxide-based nanocomposites with different sizes and morphologies.The morphology,size,elemental composition and electrochemical properties of the samples have been analyzed by various tests.The synthesized materials have been used to construct electrochemical sensors and have been successfully applied to detect hydrogen peroxide and glucose.This dissertation includes the following two aspects:1.A two-step electrodeposition method has been used to synthesize Pd-Cu/Cu₂O nanocomposites on fluorine-doped tin oxide?FTO?conductive glass,and the modified electrode has been successfully applied to detect H₂O₂.The crystal structure,morphology and elemental valence of Pd-Cu/Cu₂O nanocomposites have been analyzed by X-ray diffraction?XRD?,scanning electron microscope?SEM?and X-ray photoelectron spectroscopy?XPS?.Under the optimum conditions,comparing with the Cu₂O/FTO electrode,Pd-Cu/Cu₂O/FTO displayed excellent electrocatalytic activity for the reduction of H₂O₂,wide linear width?5-4000?M?,low detection limit?1.8?M?and strong anti-interference ability.In addition,the proposed sensor has been successfully applied for the determination of H₂O₂ in milk samples2.A two-step chemical reduction method has been applied to synthesize truncated octahedron Pd-Cu₂O nanocomposites,which has been successfully modified on glassy carbon electrode?GCE?for the construction of glucose sensor.The morphological and elemental composition of as-synthesized Pd-Cu₂O have been studied by X-ray diffraction?XRD?,scanning electron microscope?SEM?,X-ray spectroscopy?EDS?and X-ray photoelectron spectroscopy?XPS?.Truncated octahedral Pd-Cu₂O modified electrode exhibited excellent electrocatalytic performance for glucose oxidation,owing to rougher surface and forceful interfacial interaction of as-synthesized Pd-Cu₂O nanocomposites.The proposed sensor showed wide linear range?0.05–3000?M?,high sensitivity(2560.6 m A m M^–1 cm^–2)and low detection limit?0.028?M?.