Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 3, Pages 399-404Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz2016507
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Funding
- MRSEC of the National Science Foundation [DMR-0819762]
- Chesonis Foundation
- Natural Sciences and Engineering Research Council of Canada
- John Reed scholarship from the Undergraduate Research Opportunities Program
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [819762] Funding Source: National Science Foundation
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The activities of the oxygen evolution reaction (OER) on iridium-oxide- and ruthenium-oxide-based catalysts are among the highest known to date. However, the OER activities of thermodynamically stable rutile iridium oxide (r-IrO2) and rutile iridium oxide (r-RuO2), normalized to catalyst mass or true surface area are not well-defined. Here we report a synthesis of r-IrO2 and r-RuO2 nanoparticles (NPs) of similar to 6 nm, and examine their OER activities in acid and alkaline solutions. Both r-IrO2 and r-RuO2 NPs were highly active for OER, with r-RuO2 exhibiting up to 10 A/g(oxide) at 1.48 V versus reversible hydrogen electrode. When comparing the two, r-RuO2 NPs were found to have slightly higher intrinsic and mass OER activities than r-IrO2 in both acid and basic solutions. Interestingly, these oxide NPs showed higher stability under OER conditions than commercial Ru/C and Ir/C catalysts. Our study shows that these r-RuO2 and r-IrO2 NPs can serve as a benchmark in the development of active OER catalysts for electrolyzers, metal-air batteries, and photoelectrochemical water splitting applications.
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