Substrate structural effects on the synthesis and electrochemical properties of platinum nanoparticles on highly oriented pyrolytic graphite

Maryam Bayati, Jose M. Abad, Richard J. Nichols, David J. Schiffrin

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Platinum nanoparticles have been prepared by potentiostatic multipulse electrodeposition with controlled nucleation and growth on freshly cleaved and electrochemically oxidized highly oriented pyrolytic graphite. The influence of the applied potential sequence on the size distribution was investigated. For short electrolysis times, the deposition of nanoparticles takes place via a progressive nucleation mechanism. A narrow size distribution was obtained by controlling independently the nucleation and growth steps, and particles with heights between 52 and 1.4 nm could be prepared by altering the pulse parameters. Anodic oxidation of the substrate had a large influence on the particle size, resulting in the preparation of particles 1.4 nm in height. XPS demonstrated that Pt particles of small size were readily oxidized. The rate of electrochemical methanol oxidation showed a dependence on the particle size, and no oxidation of methanol could be observed for the smaller sizes investigated.
Original languageEnglish
Pages (from-to)18439-18448
Number of pages10
JournalThe Journal of Physical Chemistry C
Volume114
Issue number43
Early online date8 Oct 2010
DOIs
Publication statusPublished - 4 Nov 2010
Externally publishedYes

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