Using Palladium and Gold Palladium Nanoparticles Decorated with Molybdenum Oxide for Versatile Hydrogen Peroxide Electroproduction on Graphene Nanoribbons

Author(s)

Fortunato, Guilherme, V ; Bezerra, Leticia S. ; Cardoso, Eduardo S. F. ; Kronka, Matheus S. ; Santos, Alexsandro J. ; Greco, Anderson S. ; Junior, Jorge L. R. ; Lanza, Marcos R., V ; Maia, Gilberto

• Document type: Journal article
• Source: ACS APPLIED MATERIALS & INTERFACES; v. 14, n. 5, p. 17-pg., 2022-01-26.

Abstract

Electrocatalytic production of H2O2 via a twoelectron oxygen reduction reaction (ORR-2e(-)) is regarded as a highly promising decentralized and environmentally friendly mechanism for the production of this important chemical commodity. However, the underlying challenges related to the development of catalytic materials that contain zero or low content of noble metals and that are relatively more active, selective, and resistant for long-term use have become a huge obstacle for the electroproduction of H2O2 on commercial and industrial scales. The present study reports the synthesis and characterization of low metal-loaded (<= 6.4 wt %) catalysts and their efficiency in H2O2 electroproduction. The catalysts were constructed using gold palladium molybdenum oxide (AuPdMoOx) and palladium molybdenum oxide (PdMoOx) nanoparticles supported on graphene nanoribbons. Based on the application of a rotating ring-disk electrode, we conducted a thorough comparative analysis of the electrocatalytic performance of the catalysts in the ORR under acidic and alkaline media. The proposed catalysts exhibited high catalytic activity (ca. 0.08 mA g(noble) (-1)(metal) in an acidic medium and ca. 6.6 mA g(noble metal)(-1) in an alkaline medium), good selectivity (over 80%), and improved long-term stability toward ORR-2e(-). The results obtained showed that the enhanced ORR activity presented by the catalysts, which occurred preferentially via the twoelectron pathway, was promoted by a combination of factors including geometry, Pd content, interparticle distance, and site-blocking effects, while the electrochemical stability of the catalysts may have been enhanced by the presence of MoOx. (AU)

• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/23464-3 - Study of agrochemical degradation paraquat, sodium-metham and carbaryl by Electrochemical Advanced Oxidation Process (EAOP) using gas diffusion electrode modified with bimetallic oxides
• Grantee: Matheus Schiavon Kronka
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 19/20634-0 - Treatment of wastewater contaminated with endocrine interferences through the application of electrochemical advanced oxidation processes: synergistic effect of different carbon supported cathodes
• Grantee: Alexsandro Jhones dos Santos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/04421-7 - Production and characterization of metal-graphene or graphene oxide nanocomposites for the electrocatalytic production of hydrogen peroxide: Application to the degradation of endocrine disrupting chemicals by electrochemical advanced oxidation processes
• Grantee: Guilherme Vilalba Fortunato
• Support Opportunities: Scholarships in Brazil - Post-Doctoral