| Texto completo | |
| Autor(es): |
Silva, Hiago N.
;
Toma, Sergio Hiroshi
;
Hennemann, Artur Luis
;
Goncalves, Josue M.
;
Nakamura, Marcelo
;
Araki, Koiti
;
Toyama, Marcos Makoto
;
Toma, Henrique Eisi
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Molecules; v. 27, n. 14, p. 17-pg., 2022-07-01. |
| Resumo | |
A new supramolecular electrocatalyst for Oxygen Evolution Reaction (OER) was synthesized from a central multibridging cobalt tetrapyridylporphyrazine (CoTPyPz) species by attaching four [Ru(bpy)(2)Cl](+) groups. Both CoTPyPz and the tetraruthenated cobalt porphyrazine species, TRuCoTPyPz, form very homogenous molecular films just by dropcasting their methanol solutions onto GCE electrodes. Such films exhibited low overpotentials for O-2 evolution, e.g., 560 e 340 mV, respectively, displaying high stability, typically exceeding 15 h. The kinetic parameters obtained from the Tafel plots showed that the peripheral complexes are very important for the electrocatalytic activity. Hyperspectral Raman images taken along the electrochemical process demonstrated that the cobalt center is the primary active catalyst site, but its performance is enhanced by the ruthenium complexes, which act as electron-donating groups, in the supramolecular system. (AU) | |
| Processo FAPESP: | 18/21489-1 - Nanotecnologia supramolecular: design, materiais e dispositivos |
| Beneficiário: | Henrique Eisi Toma |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/19322-4 - Acoplamento de porfirinas/porfirazinas e clusters de rutênio em montagens supramoleculares funcionais |
| Beneficiário: | Hiago Negromonte Silva |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |