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

Yong-Tae Kim (), Pietro Papa Lopes, Shin-Ae Park, A-Yeong Lee, Jinkyu Lim, Hyunjoo Lee, Seoin Back, Yousung Jung, Nemanja Danilovic, Vojislav Stamenkovic, Jonah Erlebacher, Joshua Snyder and Nenad M. Markovic ()
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Yong-Tae Kim: Pusan National University
Pietro Papa Lopes: Argonne National Laboratory
Shin-Ae Park: Pusan National University
A-Yeong Lee: Pusan National University
Jinkyu Lim: Korea Advanced Institute of Science and Technology
Hyunjoo Lee: Korea Advanced Institute of Science and Technology
Seoin Back: Korea Advanced Institute of Science and Technology
Yousung Jung: Korea Advanced Institute of Science and Technology
Nemanja Danilovic: Argonne National Laboratory
Vojislav Stamenkovic: Argonne National Laboratory
Jonah Erlebacher: Johns Hopkins University
Joshua Snyder: Drexel University
Nenad M. Markovic: Argonne National Laboratory

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-01734-7

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