| Texto completo | |
| Autor(es): |
Silva, Camila Daiane
;
Corradini, Patricia Gon
;
Colle, Vinicius Del
;
Mascaro, Lucia Helena
;
Lima, Fabio Henrique Barros de
;
Pereira, Ernesto Chaves
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 354, p. 10-pg., 2020-09-10. |
| Resumo | |
The study of metallic multilayers (MM) has presented interesting highlights to understand electrocatalytic properties for organic molecules oxidation. This work reports the preparation and characterization of MM using rhodium or ruthenium as an intermediate layer, Pt-pc/Rh/Pt and Pt-pc/Ru/Pt, aiming to evaluate the electrocatalytic activity toward methanol and ethanol oxidation in acid medium. For methanol electro-oxidation, the evaluated MM presented higher current density than Pt-pc, especially Pt-pc/Rh-2/Pt-1 and Pt-pc/Ru-5/Pt-2, where the increase in peak current density was 283% and 422% compared to Pt-pc. By in situ infrared spectroscopy (FTIR in situ), it was observed that in MM the CO2 formation from methanol oxidation occurred in lower potentials compared to Pt-pc. In the ethanol oxidation, Pt-pc/Rh-2/Pt-1 and Pt-pc/Ru-5/Pt-2 increase in peak current density 32% and 67% compared to Pt-pc, respectively. The bands referring to the acetaldehyde, acetic acid and CO2 were observed first to MM than for Pt-pc. The better electroactivity of the metallic multilayers in the electro-oxidation of alcohols could be explained by the changes in the electronic interaction between the exposed platinum surface and the rhodium or ruthenium intermediate layer, which facilitated the oxidation of intermediates at lower potentials, and thus, increasing of the electrocatalytic activity of these materials. (C) 2020 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país |
| Beneficiário: | Ana Flávia Nogueira |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock |
| Beneficiário: | Arlene Gonçalves Corrêa |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 18/16401-8 - Fotocatalisadores e fotoeletrodos para obtenção de combustíveis renováveis |
| Beneficiário: | Lucia Helena Mascaro Sales |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |