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Open Access Publications from the University of California

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

  • Author(s): Kim, YT
  • Lopes, PP
  • Park, SA
  • Lee, AY
  • Lim, J
  • Lee, H
  • Back, S
  • Jung, Y
  • Danilovic, N
  • Stamenkovic, V
  • Erlebacher, J
  • Snyder, J
  • Markovic, NM
  • et al.

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© 2017 The Author(s). 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 Ir25Os75alloy, 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/IrO2morphology of dealloyed Ir25Os75shows a factor of ~30 improvement in activity-stability factor relative to conventional iridium-based oxide materials, and an ~8 times improvement over dealloyed Ir25Os75nanoparticles 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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