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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
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]
Número total de Autores: 7
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Electrochimica Acta; v. 267, p. 161-169, MAR 20 2018.
Citações Web of Science: 9
Resumo

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)

Processo FAPESP: 15/20776-9 - Fabricação de sondas com dimensões nanométricas para o estudo de processos bioquímicos usando microscopia eletroquímica
Beneficiário:Mauro Bertotti
Linha de fomento: Auxílio à Pesquisa - Regular