We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Balancing activity, stability and conductivity of nanoporous core-shell iridium/iridium oxide oxygen evolution catalysts.
- Authors
Yong-Tae Kim; Shin-Ae Park; A-Yeong Lee; Lopes, Pietro Papa; Danilovic, Nemanja; Stamenkovic, Vojislav; Markovic, Nenad M.; Jinkyu Lim; Hyunjoo Lee; Seoin Back; Yousung Jung; Erlebacher, Jonah; Snyder, Joshua
- 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.
- Subjects
IRIDIUM oxide; IRIDIUM; CATALYSTS; NANOPOROUS materials; STABILITY theory
- Publication
Nature Communications, 2017, Vol 8, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-017-01734-7