Surface Activation of Pt Nanoparticles Synthesised by "Hot Injection" in the Presence of Oleylamine

Jo Humphrey, Sajanikumari Sadasivan, Daniela Plana, Veronica Celorrio, Robert Tooze, David Fermin

Research output: Contribution to journalArticle (Academic Journal)peer-review

13 Citations (Scopus)
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Oleylamine (OA) based "hot injection" colloidal synthesis offers a versatile approach to the synthesis of highly monodisperse metallic and multi-metallic alloyed nanostructures in the absence of potentially toxic and unstable phosphine compounds. For application in heterogeneous catalysis and electrocatalysis, the adsorbed OA species at the metal surfaces should be effectively removed without compromising the structure and composition of the nanostructures. Herein, we investigate the removal of OA from colloidal Pt nanoparticles through 1) "chemical methods" such as washing in acetic acid or ethanol, and ligand exchange with pyridine; and 2) thermal pre-treatment between 185 and 400 °C in air, H2 or Ar atmospheres. The electrochemical reactivity of Pt nanoparticles is acutely affected by the presence of surface organic impurities, making this material ideal for monitoring the effectiveness of OA removal. The results showed that thermal treatment in Ar at temperatures above 400 °C provides highly active particles, with reactivity comparable to the benchmark commercial catalyst, Pt/ETEK. The mechanism involved in thermal desorption of OA was also investigated by thermogravimetric analysis coupled to mass spectrometry (TGA-MS). Oxidation of HCOOH and adsorbed CO in acidic solution were used as test reactions to assess the Pt electrocatalytic activity.

Original languageEnglish
Pages (from-to)12694-701
Number of pages8
JournalChemistry - A European Journal
Issue number36
Publication statusPublished - 1 Sep 2015

Bibliographical note

Date of Acceptance: 12/06/2015

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