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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synergic effects enhance the catalytic properties of alpha-Ni(OH)(2)-FeOCPc@rGO composite for oxygen evolution reaction

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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
[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

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