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Balancing activity, stability and conductivity of nanoporous core-shell iridium/iridium oxide oxygen evolution catalysts.

  • Author(s): Kim, Yong-Tae
  • Lopes, Pietro Papa
  • Park, Shin-Ae
  • Lee, A-Yeong
  • Lim, Jinkyu
  • Lee, Hyunjoo
  • Back, Seoin
  • Jung, Yousung
  • Danilovic, Nemanja
  • Stamenkovic, Vojislav
  • Erlebacher, Jonah
  • Snyder, Joshua
  • Markovic, Nenad M
  • et al.

Published Web Location

http://doi.org/10.1038/s41467-017-01734-7
No data is associated with this publication.
Abstract

The selection of oxide materials for catalyzing the oxygen evolution reaction in acid-based electrolyzers must be guided by the proper balance between activity, stability and conductivity-a challenging mission of great importance for delivering affordable and environmentally friendly hydrogen. Here we report that the highly conductive nanoporous architecture of an iridium oxide shell on a metallic iridium core, formed through the fast dealloying of osmium from an Ir25Os75 alloy, exhibits an exceptional balance between oxygen evolution activity and stability as quantified by the activity-stability factor. On the basis of this metric, the nanoporous Ir/IrO2 morphology of dealloyed Ir25Os75 shows a factor of ~30 improvement in activity-stability factor relative to conventional iridium-based oxide materials, and an ~8 times improvement over dealloyed Ir25Os75 nanoparticles due to optimized stability and conductivity, respectively. We propose that the activity-stability factor is a key "metric" for determining the technological relevance of oxide-based anodic water electrolyzer catalysts.

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