Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of Carbon Nanotubes Supported PtCo Electrocatalysts and Its Characterization for the Cathode Electrode of PEMFC

탄소나노튜브에 담지된 PtCo 촉매 제조 및 PEMFC Cathode 전극 특성

  • Jung, Dong-Won (School of Materials Science and Engineering, University of Ulsan) ;
  • Park, Soon (School of Materials Science and Engineering, University of Ulsan) ;
  • Kang, Jung-Tak (School of Chemical Engineering&Bioengineering, University of Ulsan) ;
  • Kim, Jun-Bom (School of Chemical Engineering&Bioengineering, University of Ulsan)
  • 정동원 (울산대학교 첨단소재공학부) ;
  • 박순 (울산대학교 첨단소재공학부) ;
  • 강정탁 (울산대학교 생명화학공학부) ;
  • 김준범 (울산대학교 생명화학공학부)
  • Published : 2009.05.27
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Abstract

The electrocatalytic behavior of the PtCo catalyst supported on the multi-walled carbon nanotubes (MWNTs) has been evaluated and compared with commercial Pt/C catalyst in a polymer electrolyte membrane fuel cell(PEMFC). A PtCo/MWNTs electrocatalyst with a Pt:Co atomic ratio of 79:21 was synthesized and applied to a cathode of PEMFC. The structure and morphology of the synthesized PtCo/MWNTs electrocatalysts were characterized by X-ray diffraction and transmission electron microscopy. As a result of the X-ray studies, the crystal structure of a PtCo particle was determined to be a face-centered cubic(FCC) that was the same as the platinum structure. The particle size of PtCo in PtCo/MWNTs and Pt in Pt/C were 2.0 nm and 2.7 nm, respectively, which were calculated by Scherrer's formula from X-ray diffraction data. As a result we concluded that the specific surface activity of PtCo/MWNTs is superior to Pt/C's activity because of its smaller particle size. From the electrochemical impedance measurement, the membrane electrode assembly(MEA) fabricated with PtCo/MWNTs showed smaller anodic and cathodic activation losses than the MEA with Pt/C, although ohmic loss was the same as Pt/C. Finally, from the evaluation of cyclic voltammetry(CV), the unit cell using PtCo/MWNTs as the cathode electrocatalyst showed slightly higher fuel cell performance than the cell with a commercial Pt/C electrocatalyst.

Keywords

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