Platinum-free lead dioxide electrode for electrooxidation of organic compounds

Abstract

As electrode material, PbO2 coatings are inexpensive and easy to manufacture by anodic deposition. Moreover, they present low resistivity and, due to their high efficiency in organic oxidation reactions, they continue to attract interest as an object of study and of application in the electrochemical treatment of effluents. During preparation of the electrode, a thin Pt layer is usually deposited on the Ti substrate before receiving the PbO2 layer in order to prevent the formation of TiO2 on the substrate surface, thereby ensuring adhesion of the coating. In this study, PbO2 layers were deposited on a Ti substrate, using Pb as interlayer in place of Pt. Aiming for a cheaper and faster-to-prepare electrode, the Pb interlayer was reduced from a Pb(NO3)2 solution on Ti and then, by reversing the potential in the same electrolyte, PbO2 was anodically deposited. The Ti/Pt/PbO2 and Ti/Pb/PbO2 electrodes were characterized comparatively by cyclic voltammetry in the potential region where the solid state surface redox transitions (SSSRT) take place. Capacitive currents were compared as well as the roughness factor being the Ti/Pb/PbO2 electrode rougher, with higher surface area. As a consequence, it showed better performance in the color electro-removal of a Remazol Black azo dye solution.

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Identifiers

ORCID for Carlos Ponce de Leon: orcid.org/0000-0002-1907-5913

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