Tungsten carbide (WC) nanofibers with ultrafine diameters were synthesized by carbonizing the as-spun ammonium metatungstate (AMT) and polyvinyl pyrrolidone (PVP) composite fiber precursors. The morphologies of the WC nanofiber products were closely related to the electrospinning concentrations of AMT and PVP. Raman spectra and high resolution T EM (HR-TEM) testified that the surface of the WC nanofibers was coated by a carbon layer with a thickness of several nanometers, which could be removed to a great degree by NH3 etching at high temperature. Cyclic voltammetry (CV) and rotating disk electrode (RDE) test results showed that the carbon-coated WC nanofibers had good electrocatalytic activities and stabilities during oxygen reduction reaction (ORR), both of which could be further improved by NH3 post-treatment at high temperature. The catalytic roles of the WC nanofiber samples for ORR probably originated from the WC sites, but not excluding some contributions of the surface carbon species. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Jorio, Ado
Lucchese, Marcia M.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Lucchese, Marcia M.
Stavale, Fernando
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Stavale, Fernando
Martins Ferreira, Erlon H.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Martins Ferreira, Erlon H.
Moutinho, Marcus V. O.
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Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Moutinho, Marcus V. O.
Capaz, Rodrigo B.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, Brazil
Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Capaz, Rodrigo B.
Achete, Carlos A.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, Brazil
Univ Fed Rio de Janeiro, PEMM, BR-21945970 Rio De Janeiro, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
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Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, CanadaNatl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
Lee, Kunchan
Zhang, Lei
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Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, CanadaNatl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
Zhang, Lei
Zhang, Jiujun
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Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, CanadaNatl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
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Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Jorio, Ado
Lucchese, Marcia M.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Lucchese, Marcia M.
Stavale, Fernando
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Stavale, Fernando
Martins Ferreira, Erlon H.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Martins Ferreira, Erlon H.
Moutinho, Marcus V. O.
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Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Moutinho, Marcus V. O.
Capaz, Rodrigo B.
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Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, Brazil
Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Capaz, Rodrigo B.
Achete, Carlos A.
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h-index: 0
机构:
Inst Nacl Metrol Normalizacao & Qualidade Ind INM, Div Mat Metrol, BR-25250020 Duque De Caxias, RJ, Brazil
Univ Fed Rio de Janeiro, PEMM, BR-21945970 Rio De Janeiro, BrazilUniv Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
机构:
Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, CanadaNatl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
Lee, Kunchan
Zhang, Lei
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Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, CanadaNatl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
Zhang, Lei
Zhang, Jiujun
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h-index: 0
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Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, CanadaNatl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada