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Journal article
Balancing activity, stability and conductivity of nanoporous core-shell iridium/iridium oxide oxygen evolution catalysts
Nature communications, v 8(1), 1449
13 Nov 2017
PMID: 29129907
Featured in Collection : UN Sustainable Development Goals @ Drexel
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 similar to 30 improvement in activity-stability factor relative to conventional iridium-based oxide materials, and an similar to 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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Details
- Title
- Balancing activity, stability and conductivity of nanoporous core-shell iridium/iridium oxide oxygen evolution catalysts
- Creators
- Yong-Tae Kim - Pusan National UniversityPietro Papa Lopes - Argonne National LaboratoryShin-Ae Park - Pusan National UniversityA-Yeong Lee - Pusan National UniversityJinkyu Lim - Korea Advanced Institute of Science and TechnologyHyunjoo Lee - Korea Advanced Institute of Science and TechnologySeoin Back - Korea Advanced Institute of Science and TechnologyYousung Jung - Korea Advanced Institute of Science and TechnologyNemanja Danilovic - Argonne National LaboratoryVojislav Stamenkovic - Argonne National LaboratoryJonah Erlebacher - Johns Hopkins UniversityJoshua Snyder - Drexel UniversityNenad M. Markovic - Argonne National Laboratory
- Publication Details
- Nature communications, v 8(1), 1449
- Publisher
- Springer Nature
- Number of pages
- 8
- Grant note
- R201500910 / Nano-Convergence Foundation 2015R1A2A1A10056156 / National Research Foundation DE-AC02-06CH11357 / UChicago Argonne, LLC 20153010041750 / Korea Institute of Energy Technology Evaluation and Planning - Korea government Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000414915900011
- Scopus ID
- 2-s2.0-85033794732
- Other Identifier
- 991019168818304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical