Autor(es)

Antonin, Vanessa S. ; Parreira, Luanna S. ; Aveiro, Luci R. ; Silva, Fernando L. ; Valim, Ricardo B. ; Hammer, Peter ; Lanza, Marcos R. V. ; Santos, Mauro C.

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 231, p. 713-720, MAR 20 2017.
• Citações Web of Science: 11

Resumo

In this work, materials based on core-shell W@Au type structures were found to have promise for use as electrocatalysts on the in-situ production of H2O2 by means of the oxygen reduction reaction (ORR). We describe herein the synthesis and characterization of these materials and then present a study of electrocatalytic activity towards ORR by the electrogeneration of H2O2 employing these materials supported on Vulcan XC-72R carbon corresponding to 1 and 2 wt% loading. The use of W@Au/C materials led to higher activity compared to pure carbon and commercial Pt/C, and the optimal load is 1%, which presented the highest ring current for the ORR using the rotating ring-disk electrode technique. Exhaustive electrolysis using a W@Au/C 1% gas diffusion electrode (GDE) was employed to verify the real amount of H2O2 electrogenerated comparing with a Vulcan XC-72R GDE. We verified that the W@Au/C 1% material is able to generate 50% more H2O2 than carbon. These results can be explained based on synergistic interactions presented by the W@Au/C 1% material and also by both conductivity and hydrophilicity differences provided by the nanostructures supported on carbon. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/21656-6 - Materiais Nanoestruturados Binários Baseados em Metais na Eletrogeração de Peróxido de Hidrogênio para Degradação do Ciprofloxacino
• Beneficiário: Vanessa da Silva Antonin
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/10314-8 - Nanoestruturas para a Degradação de Fenol, Ciprofloxacino e 17 alfa etinilestradiol
• Beneficiário: Mauro Coelho dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular