| Texto completo | |
| Autor(es): |
Galiote, Nelson A.
[1, 2, 3]
;
Ulissi, Ulderico
[2, 3]
;
Passerini, Stefano
[2, 3]
;
Huguenin, Fritz
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto, SP - Brazil
[2] HIU, Helmholtzstr 11, D-89081 Ulm - Germany
[3] Karlsruhe Inst Technol, POB 3640, D-76021 Karlsruhe - Germany
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Physical Chemistry C; v. 122, n. 28, p. 15826-15834, JUL 19 2018. |
| Citações Web of Science: | 2 |
| Resumo | |
Although lithium oxygen batteries theoretically have high energy density, they are far from becoming viable and practical alternatives to current batteries because the oxygen reduction reaction (ORR) is slow, which limits the applicability of lithium oxygen batteries, and these power sources require suitable catalysts for optimum performance. Understanding the chemical and electrochemical steps involved in the ORR mechanism is mandatory. This work investigates platinum nanoparticles (Pt-nps) dispersed in graphitized carbon as a positive electrode for lithium air batteries, characterizes the materials by cyclic voltammetry and galvanostatic cycling, X-ray diffraction, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, and determines the kinetic constants for the reaction mechanism steps with the help of electrochemical impedance measurements and modeling. The electron transfer to oxygen molecules adsorbed onto Pt-nps is the rate-limiting step. Li2O2 is preferentially produced via the electrochemical pathway instead of the chemical disproportionation reaction, leading to a device with improved reversibility and enhanced energy density. (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: | 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 |
| Processo FAPESP: | 15/16867-9 - Baterias de Neutralização e Mistura Entrópica |
| Beneficiário: | Fritz Cavalcante Huguenin |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |