Electrochemical surface science of platinum electrodes

  • TH and ISC Seminar
  • Date: Jun 5, 2023
  • Time: 11:00 AM (Local Time Germany)
  • Speaker: Prof. Dr. Marc Koper
  • Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands
  • Location: Building M, Richard-Willstätter-Haus, Faradayweg 10, 14195 Berlin
  • Room: Seminar Room
  • Host: TH and ISC Seminar
  • Contact: monteiro@fhi-berlin.mpg.de
Electrochemical surface science of platinum electrodes
This talk will discuss recent insights into the electrochemistry of platinum, highlighting three topics.

First, the double-layer structure and surface chemistry on platinum is highly structure and electrolyte sensitive, with steps and defects being oxidized already in what is classically assumed to be hydrogen region. Second, the roughening occurring during oxidation and reduction cycling is imaged using in situ electrochemical STM, demonstrating an important role of nano-island formation and step meandering. Finally, at sufficiently negative potential, platinum undergoes anisotropic cathodic corrosion, as illustrated by ex situ SEM and in situ electrochemical AFM. X-Ray spectroscopy and DFT calculations suggest a crucial role for ternary metal hydrides as the key cathodic corrosion intermediate.

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