Electrocatalytic Hydrogen Peroxide Generation Using WO${}_3$ Nanoparticle-Decorated Sodium Niobate Microcubes

Abstract

The current work studies the electrocatalytic performance of NaNbO${}_3$ microcubes decorated with WO${}_3$ nanoparticles on Printex L6 at varying concentrations (1%, 3%, 5%, and 10% by weight) for H${}_2$O${}_2$ electrogeneration aiming for future use in electrochemical advanced oxidation processes for organic pollutant degradation H${}_2$O${}_2$ electrogeneration was studied using oxygen reduction reaction (ORR) with the rotating ring-disk electrode (RRDE) technique. Electrochemical results revealed an improvement in H${}_2$O${}_2$ electrogeneration for the NaNbO${}_3$@WO${}_3$/C materials compared to that achieved with Printex L6 carbon. Notably, the 5% NaNbO${}_3$@WO${}_3$/C electrocatalyst exhibited a higher ring current for oxygen reduction reaction and promoted a 2.1-electron transfer, facilitating a higher rate of H${}_2$O${}_2$ electrogeneration through the 2-electron mechanism. Also, enhancing oxygen-containing functional groups has shown the capability to thoroughly adjust characteristics and enhance active sites, increasing H${}_2$O${}_2$ electrogeneration. These findings suggest that 5% NaNbO${}_3$@WO${}_3$/C electrocatalysts hold promise for in situ hydrogen peroxide electrogeneration.