Fabrication of Pt/Ru Nanoparticle Pair Arrays with Controlled Separation and their Electrocatalytic Properties
Artikel i vetenskaplig tidskrift, 2011

Aiming at the investigation of spillover and transport effects in electrocatalytic reactions on bimetallic catalyst electrodes, we have prepared novel, nanostructured electrodes consisting of arrays of homogeneously distributed pairs of Pt and Ru nanodisks of uniform size and with controlled separation on planar glassy carbon substrates. The nanodisk arrays (disk diameter approximate to 60 nm) were fabricated by hole-mask colloidal lithography; the separation between pairs of Pt and Ru disks was varied from -25 nm (overlapping) via +25 nm to +50 nm. Morphology and (surface) composition of the Pt/Ru nanodisk arrays Were characterized by scanning electron microscopy, energy dispersive X-ray analysis, and X-ray Photoelectron spectroscopy, the electrochemical/electrocatalytic properties were explored by cyclic voltammetry, COad monolayer oxidation ("COad stripping"), and potentiodynamic hydrogen oxidation. Detailed analysis of the 2 COad oxidation peaks revealed that on all bimetallic pairs these cannot be reproduced by superposition of the peaks obtained on electrodes with Pt/Pt or Ru/Ru pairs, pointing to effective Pt-Ru interactions even between rather distant pairs (50 nm). Possible reasons for this observation and its relevance for the understanding of previous reports of highly active catalysts with separate Pt and Ru nanoparticles are discussed. The results clearly demonstrate that this preparation method is perfectly suited for fabrication of planar model electrodes with well-defined arrays of bimetallic nanodisk pairs, which opens up new possibilities for model studies of electrochemical/electrocatalytic reactions.

COad monolayer oxidation

colloidal

arrays

lithography

model electrode

electrochemical mass-spectrometry

pt/glassy carbon electrodes

nanoparticle

hole-mask colloidal

hydrogen oxidation reaction

ru(0001) electrodes

platinum

fuel-cell

oxygen

ruthenium

methanol oxidation

theoretical treatment

reduction reaction

co electrooxidation

lithography

microelectrode

Författare

Björn Wickman

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Y.E. Seidel

Universität Ulm

Z. Jusys

Universität Ulm

Bengt Herbert Kasemo

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

R.J. Behm

Universität Ulm

ACS Nano

1936-0851 (ISSN) 1936-086X (eISSN)

Vol. 5 4 2547-2558

Ämneskategorier

Materialteknik

Kemi

DOI

10.1021/nn1021692

Mer information

Senast uppdaterat

2018-02-28