Palladium, silver-palladium, and Palladium-Platinum nanomaterials: maneuvering sha...
| Full text | |
| Author(s): |
Goncalves, Josue M.
[1]
;
Matias, Tiago A.
[1]
;
Saravia, Lucas P. H.
[1]
;
Nakamura, Marcelo
[1]
;
Bernardes, Juliana S.
[2]
;
Bertotti, Mauro
[1]
;
Araki, Koiti
[1]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
[2] Natl Ctr Energy & Mat CNPEM, Natl Nanotechnol Lab LNNano, Rua Giuseppe Maximo Scolfaro 10-000, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Electrochimica Acta; v. 267, p. 161-169, MAR 20 2018. |
| Web of Science Citations: | 10 |
| Abstract | |
The effect of size and degree of crystallinity, and the synergic interaction of alpha-Ni(OH)(2) nanoparticles (alpha-Ni) with reduced graphene oxide (rGO) and octacarboxyphthalocyaninate iron(II) (FeOCPc), on the electrocatalytic activity for the oxygen evolution reaction (OER) are demonstrated using structurally well-defined nanocomposite materials. Larger and crystalline alpha-Ni@ rGO-K nanoparticles (4.7 +/- 1.8 nm) generated materials with higher activity than the respective alpha-Ni(OH)(2)-Na derivatives (1.8 +/- 0.3 nm), where the incorporation of rGO improved dramatically the performance. However, an even larger efficiency was achieved when alpha-Ni@ rGO-K was covered up with a controlled amount of FeOCPc, a poor molecular OER catalyst, in this way demonstrating a synergic effect of that macrocycle on the reaction kinetics decreasing further the overpotential of the oxygen evolution reaction. In fact, alpha-NiFeOCPc@rGO-K was the ternary composite material with best performance, being able to sustain a stable current of 10 mA cm(-2) during 8 h of continuous electrolysis at 1.64 V vs RHE, in 1.0 mol dm(-3) KOH solution, showing good perspectives as electrode material for OER. (C) 2018 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 15/20776-9 - Fabrication of nanometric probes for the study of biochemical processes by using scanning electrochemical microscopy |
| Grantee: | Mauro Bertotti |
| Support type: | Regular Research Grants |