Electrocatalytic hydrogen peroxide generation using WO₃ nanoparticle-decorated sodium niobate microcubes

Author(s)

Antonin, Vanessa S. ; Souza, Felipe M. ; Pinheiro, Victor S. ; Moura, Joao P. C. ; Trench, Aline B. ; Fernandes, Caio Machado ; Lanza, Marcos R. V. ; Santos, Mauro C.

• Document type: Journal article
• Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 959, p. 9-pg., 2024-03-15.

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 & sdot; 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. (AU)

• FAPESP's process: 20/14100-0 - Sodium niobate electrodes decorated with WO3 and CeO2 for degradation of the organophosphate pesticide acephate by advanced oxidative electrochemical processes
• Grantee: Felipe de Moura Souza
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/14394-7 - Use of Vulcan XC-72 carbon modified with fluorine and/or cerium doped niobium nanostructures in the electrogeneration of H2O2 for degradation of endocrine disruptors by advanced electrochemical oxidative processes
• Grantee: Aline Barrios Trench
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/05364-7 - Nanostructured electrocatalysts based on manganese and tungsten oxides supported on carbon for electrogeneration of hydrogen peroxide and electrochemical degradation of ciprofloxacino
• Grantee: João Paulo Carvalho Moura
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/21846-6 - Nanostructures for environmental remediation and power generation from renewable sources
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 22/10484-4 - Application of low-cost nanomaterials for degradation of endocrine disruptors through advanced electrochemical oxidation processes under the influence of a magnetic field
• Grantee: Caio Machado Fernandes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral