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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.)

A Facile Strategy to Support Palladium Nanoparticles on Carbon Nanotubes, Employing Polyvinylpyrrolidone as a Surface Modifier

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Autor(es):
Cardoso, Mariana B. T. [1] ; Lewis, Edward [2] ; Castro, Pollyana S. [1] ; Dantas, Luiza M. F. [1] ; De Oliveira, Caio C. S. [1] ; Bertotti, Mauro [1] ; Haigh, Sarah J. [2] ; Camargo, Pedro H. C. [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
[2] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs - England
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: European Journal of Inorganic Chemistry; v. 2014, n. 9, p. 1439-1445, MAR 2014.
Citações Web of Science: 7
Resumo

This paper describes the development of a facile and environmentally friendly strategy for supporting palladium nanoparticles (Pd NPs) on multiwalled carbon nanotubes (MWCNTs) with ethanol as the solvent/reducing agent, potassium tetrachloropalladate(II) (K2PdCl4) as the Pd precursor, and polyvinylpyrrolidone (PVP) as the surface modifier. More specifically, our approach was based on the nonbonding interaction between MWCNTs and PVP, which is a cheap, nontoxic, and commercial polymer. As PVP can serve not only as a surface modifier but also as a stabilizing agent for Pd NPs, the utilization of additional functionalization steps, reducing agents, and stabilizers was not required to achieve uniform Pd deposition over the MWCNTs. Our results demonstrate that Pd NPs below 5 nm in diameter can be directly supported on MWCNTs by this route. Also, sequential Pd-reduction steps can be employed to improve the coverage of Pd NPs at the MWCNT surfaces, although this can also lead to the formation of larger Pd particles or aggregates. The electrocatalytic activity for ethanol oxidation was investigated as a function of the composition and structure of the materials produced, in which MWCNTs decorated with Pd NPs of smaller sizes and lower coverages displayed the highest activities. The results described herein suggest that our approach may serve as a simple platform for the synthesis of MWCNTs decorated with metal NPs with well-defined morphologies and uniform dispersion for electrochemical and catalytic applications. (AU)

Processo FAPESP: 13/19861-6 - Nanomateriais metálicos controlados para aplicações em catálise
Beneficiário:Pedro Henrique Cury Camargo
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 11/06847-0 - Nanoestruturas polimetálicas contendo interiores vazios e tamanho, forma e composições definidas
Beneficiário:Pedro Henrique Cury Camargo
Linha de fomento: Auxílio à Pesquisa - Regular