Journal
CHEMISTRY OF MATERIALS
Volume 22, Issue 3, Pages 755-761Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm9013046
Keywords
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Funding
- NSF/DMR [0606264]
- GAANN
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0606264] Funding Source: National Science Foundation
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Polycrystalline Au nanoparticles (NPs) of 3, 6, and 8 nm were synthesized via solution phase reaction of HAuCl4 center dot 3H(2)O With tert-butylamine borane and oleylamine in tetrahydronaphthalene. The sizes of the Au NPs were tuned by varying the reaction temperatures (40-3 degrees C). For polycrystalline Au NPs made at room temperature or above, smaller NPs showed more positive onset potential in catalyzing oxygen reduction reaction (ORR) in 0.5 M KOH media. However the most active Au NPs were the 8 nm ones that were synthesized at 3 degrees C. We rationalized the ORR activity of these Au NPs by the case of oleylamine surfactant removal and the degree of disorder in the polycrystalline structure. This was further confirmed by the low activity observed from the same Au NPs passivated with hexadecanethiol, or from the Au NPs with higher degree of crystallinity made from the etching of the composite Au-Fe3O4 NPs.
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