Electroreduction of Oxygen in Polymer Electrolyte Fuel Cells by Activated Carbon Coated Cobalt Nanocrystallites Produced by Electric Arc Discharge
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- 作者：G. Lalande ; D. Guay ; J. P. Dodelet ; S. A. Majetich ; and M. E. McHenry
- 刊名：Chemistry of Materials
- 出版年：1997
- 出版时间：March 1997
- 年：1997
- 卷：9
- 期：3
- 页码：784 - 790
- 全文大小：349K
- 年卷期：v.9,no.3(March 1997)
- ISSN：1520-5002
文摘
Carbon-coated fcc cobalt nanocrystallites produced by the carbonarc method havepractically no activity as catalysts for O2 reduction inH2/O2 polymer electrolyte fuelcells.This material, containing 17.0 wt % Co, was activated by apyrolysis step at 1000 
C in Arcontaining acetonitrile vapor. When it was used at the cathode ofa single fuel cell element,it provided an initial current of 0.10 A/cm2 mg of Co at0.5 V and 50 C. This currentdecreased by 40% after 300 h. Only a fraction of thecarbon-coated metal in the initialmaterial was activated by the pyrolysis treatment. XPS and TEMcharacterizations wereperformed on the catalyst at various stages of itspreparation.
C in Arcontaining acetonitrile vapor. When it was used at the cathode ofa single fuel cell element,it provided an initial current of 0.10 A/cm2 mg of Co at0.5 V and 50 C. This currentdecreased by 40% after 300 h. Only a fraction of thecarbon-coated metal in the initialmaterial was activated by the pyrolysis treatment. XPS and TEMcharacterizations wereperformed on the catalyst at various stages of itspreparation.