Platinum nanoparticle inclusion into a carbonized polymer of intrinsic microporosity: Electrochemical characteristics of a catalyst for electroless hydrogen peroxide production

Robert K. Adamik, Naiara Hernández-Ibáñez, Jesus Iniesta, Jennifer K. Edwards, Alexander G.R. Howe, Robert D. Armstrong, Stuart H. Taylor, Alberto Roldan, Yuanyang Rong, Richard Malpass-Evans, Mariolino Carta, Neil B. McKeown, Daping He, Frank Marken

Research output: Contribution to journalArticle

3 Citations (Scopus)
14 Downloads (Pure)

Abstract

The one-step vacuum carbonization synthesis of a platinum nano-catalyst embedded in a microporous heterocarbon (Pt@cPIM) is demonstrated. A nitrogen-rich polymer of an intrinsic microporosity (PIM) precursor is impregnated with PtCl₆ 2- to give (after vacuum carbonization at 700 °C) a nitrogen-containing heterocarbon with embedded Pt nanoparticles of typically 1⁻4 nm diameter (with some particles up to 20 nm diameter). The Brunauer-Emmett-Teller (BET) surface area of this hybrid material is 518 m² g -1 (with a cumulative pore volume of 1.1 cm³ g -1) consistent with the surface area of the corresponding platinum-free heterocarbon. In electrochemical experiments, the heterocarbon-embedded nano-platinum is observed as reactive towards hydrogen oxidation, but essentially non-reactive towards bigger molecules during methanol oxidation or during oxygen reduction. Therefore, oxygen reduction under electrochemical conditions is suggested to occur mainly via a 2-electron pathway on the outer carbon shell to give H₂O₂. Kinetic selectivity is confirmed in exploratory catalysis experiments in the presence of H₂ gas (which is oxidized on Pt) and O₂ gas (which is reduced on the heterocarbon surface) to result in the direct formation of H₂O₂.

Original languageEnglish
Article number542
Pages (from-to)1-14
Number of pages14
JournalNanomaterials
Volume8
Issue number7
DOIs
Publication statusPublished - 18 Jul 2018

Keywords

  • Bifunctional catalysis
  • Heterocarbon
  • Microporosity
  • Peroxide
  • Voltammetry

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemical Engineering(all)

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