期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-01734-7
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资金
- UChicago Argonne, LLC [DE-AC02-06CH11357]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- National Research Foundation [2015R1A2A1A10056156]
- Nano-Convergence Foundation [R201500910]
- Korea Institute of Energy Technology Evaluation and Planning - Korea government [20153010041750]
- Korea Evaluation Institute of Industrial Technology (KEIT) [R201700810, 20153010041750] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [10Z20130011056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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