Increasing durability of Pt-surface-enriched nanosize structure catalysts by multi-step platinum deposition

Dmitri Kaplan, Meital Goor, Larisa Burstein, Inna Popov, Meital Shviro, Emanuel Peled

Research output: Contribution to journalArticlepeer-review

Abstract

The sluggish reaction of oxygen reduction in proton-exchange membrane fuel cells (PEMFCs) and the durability of platinum-based catalysts have been major economical and technological barriers to the widespread application of PEMFCs. We report here on two Pt-surface-enriched nanosize structure (Pt-SENS) catalysts with iridium core, synthesized with the use of single-step and successive step-by-step electroless deposition of platinum. The synthesized catalysts were studied by energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and transmission scanning electron microscopy (STEM). Electrochemical analysis demonstrated improved oxygen reduction reaction (ORR) mass activity of the homemade catalysts by 25–30% compared with commercial 50%Pt/C catalyst and improved durability, by a factor of ~ 3, of the catalyst synthesized by successive step-by-step deposition following accelerated stress test (AST). Higher mass activities are attributed to better platinum utilization as a result of a Pt-surface-enriched structure, while greater durability is attributed to the stabilization of surface platinum by stronger Pt–Ir bonds induced by iridium atoms in the core.

Original languageEnglish
Pages (from-to)2385-2393
Number of pages9
JournalJournal of Solid State Electrochemistry
Volume24
Issue number10
DOIs
StatePublished - 1 Oct 2020

Keywords

  • Catalyst
  • Durability
  • Iridium
  • Oxygen
  • Platinum
  • Reduction
  • Synthesis

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