The electrocatalytic oxidation of urea on nickel-graphene and nickel-graphene oxide composite electrodes. (10th May 2019)

• Record Type: Journal Article
• Authors: Urbańczyk, Ewelina; Maciej, Artur; Stolarczyk, Agnieszka; Basiaga, Marcin; Simka, Wojciech
• Is Part Of: Electrochimica acta. Volume 305(2019)
• Page Start: 256
• Page End: 263
• Publication Date: 2019-05-10
• Subjects: Graphene -- Nickel-graphene electrodes -- Composite electrodes -- Electrocatalytic oxidation -- Oxidation of urea -- Direct urea fuel cells; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.03.045
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this work, nickel-graphene and nickel-graphene oxide composite electrodes were employed as anodes in the electrocatalytic oxidation of urea in an alkaline solution. These composite electrodes have a higher surface area than the unmodified nickel electrode. As the current density increases during the composite formation process, the roughness of the surface and the adhesion of the coating to the substrate increase. The obtained composites have a higher activity than the nickel electrode in both alkaline solution and alkaline solution supplemented with urea. Furthermore, the nickel-graphene composite electrodes are characterized by a higher electroactivity than nickel-graphene oxide electrodes in the urea oxidation process. Highlights: Ni-G and Ni-GO composites as electroactive anodes for urea oxidation. Electrocatalytic properties of Ni-G and Ni-GO composites were determined. Ni-G and Ni-GO anodes have higher surface area than non-modified Ni electrode.