| Full text | |
| Author(s): |
Silva, Hiago N.
;
Toma, Sergio Hiroshi
;
Hennemann, Artur Luis
;
Goncalves, Josue M.
;
Nakamura, Marcelo
;
Araki, Koiti
;
Toyama, Marcos Makoto
;
Toma, Henrique Eisi
Total Authors: 8
|
| Document type: | Journal article |
| Source: | Molecules; v. 27, n. 14, p. 17-pg., 2022-07-01. |
| Abstract | |
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) | |
| FAPESP's process: | 18/21489-1 - Supramolecular nanotechnology: design, materials and devices |
| Grantee: | Henrique Eisi Toma |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/19322-4 - Supramolecular assembling of porphirins/porphyrazines and ruthenium clusters |
| Grantee: | Hiago Negromonte Silva |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |