| Texto completo | |
| Autor(es): |
Galiote, Nelson A.
;
Jeong, Sangsik
;
Morais, William G.
;
Passerini, Stefano
;
Huguenin, Fritz
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 247, p. 610-616, SEP 1 2017. |
| Citações Web of Science: | 7 |
| Resumo | |
We have investigated the oxygen reduction reaction (ORR) in the presence of non-aqueous electrolytes in an attempt to overcome the challenges related to lithium-air batteries, such as low reversibility, poor rate capability, and electrode/solvent stability. We have used glassy carbon as the working electrode in electrolytes composed of lithium bis(trifluoromethanesulfonyl)imide and 1,2-dimethoxyethane or N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI, ionic liquid). We have employed the kinetic model to treat the electrochemical impedance spectroscopy data. This approach provides the rate constants for each of the elementary steps and allows indirect investigation of the role played by the ionic liquid in the ORR. The ionic liquid shifts the onset potential of the ORR to more positive values. The presence of the large Pyr(14)(+) cation increases the rate-determining step by approximately three orders of magnitude as compared to the ether-based electrolyte. This ionic liquid is chemically resistant to degradation reactions and increases the rate of the ORR, which makes it a promising candidate for use in lithium-air batteries. (C) 2017 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 11/12668-0 - Materiais Nanoparticulados para Baterias de Lítio-ar |
| Beneficiário: | Nelson Alexandre Galiote Silva |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 11/21545-0 - Eletrocatalisadores para baterias de Li-ar |
| Beneficiário: | Fritz Cavalcante Huguenin |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 14/15798-0 - Investigação do mecanismo cinético da reação de redução do oxigênio em solventes não aquosos |
| Beneficiário: | Nelson Alexandre Galiote Silva |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |