| Texto completo | |
| Autor(es): |
Ragassi, Gianluca
;
Dourado, Andre H. B.
;
Varela, Hamilton
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Chemistry Chemical Physics; v. 25, n. 47, p. 12-pg., 2023-12-06. |
| Resumo | |
The oscillatory electro-oxidation of 2-propanol on platinum and platinum-based catalysts has attracted growing attention in recent years due to its importance in the interconversion between chemical and electrical energies. This reaction might proceed with a very high selectivity to acetone, nearly without the formation of carbon dioxide, and the reversibility of the 2-propanol/acetone pair is very appropriate for hydrogen transfer. An important aspect of this system is the ubiquitous emergence of potential oscillations under current control, and it has been pointed out as a problem to be avoided and a primary cause of limitations to the use of 2-propanol in practical devices. Herein, we present an experimental study of the electrochemical instabilities in the electro-oxidation of 2-propanol on platinum. The system was studied using polycrystalline platinum, in acidic media and at different temperatures. Besides the extensive characterization of the potential oscillations, we have also discussed possible venues for engineering the dynamics to benefit from the potential oscillations. In this sense, we have also characterized the instabilities in the system containing a mixture of 2-propanol and methanol. The efficiency of a hypothetical fuel cell operated under different conditions is also presented. Taking advantage of the self-organized potential oscillations in the electro-oxidation of isopropanol. (AU) | |
| Processo FAPESP: | 21/09630-3 - Reforma Eletrocatalítica de Lignina em Meio Alcalino: Estudo da Cinética e Mecanismos para Maior Produção de Hidrogênio |
| Beneficiário: | André Henrique Baraldi Dourado |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 21/13564-6 - Instabilidades cinéticas na eletro-oxidação do isopropanol sobre Pt e Pt-Ru |
| Beneficiário: | Gianluca Ragassi |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |
| Processo FAPESP: | 19/22183-6 - Electrocatálise VI: aspectos fundamentais e aplicados em problemas emergentes e clássicos em conversão eletroquímica de energia |
| Beneficiário: | Edson Antonio Ticianelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia |