期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 21, 页码 7668-7677出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10393h
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资金
- U.S. Office of Naval Research
Halogenated polypyrroles are rendered significantly more stable against oxidative degradation than native polypyrrole and the electron-withdrawing substituents also permit tuning of the electronic state of coordinated catalytic metal ions. Poly(difluoropyrrole), or poly(dfp), was deposited on high-surface-area Vulcan carbon (VC) via bulk electrolytic oxidation of the monomer 3,4-difluoropyrrole at VC slurried in (n-C4H9)(4)NClO4/acetonitrile; the carbon-supported polymer was subsequently metallated with cobalt(II) ions. As determined by thermal, micrographic, elemental, and chemical state analyses, the Co-poly(dfp)/VC composite is similar to 7 wt% poly(dfp) with the polymer inhomogeneously deposited over the Vulcan carbon, and the incorporated Co(II) ions coordinated by nitrogen atoms in the pyrrole moieties. Films of Co-poly(dfp)/VC cast on glassy carbon disk electrodes are electrocatalytically active for the two-electron reduction of oxygen in 0.1 M aqueous perchloric acid as assessed by hydrodynamic voltammetry, thereby demonstrating the viability of halogenated polypyrroles as electrocatalytic materials.
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