Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Characteristics of Pt, Pt-Ru and Pt-CeO2 Catalysts Supported on Carbon Nanotubes for Methanol Fuel Cell

탄소 나노튜브에 담지된 Pt, Pt-Ru 및 Pt-CeO2 메탄올 연료전지 촉매의 특성

  • Hwang, Gui-Sung (Department of Advanced Materials Engineering, Dankook University) ;
  • Lee, Rhim-Youl (Department of Advanced Materials Engineering, Dankook University)
  • 황귀성 (단국대학교 신소재공학과) ;
  • 이임열 (단국대학교 신소재공학과)
  • Received : 2010.12.09
  • Accepted : 2011.01.10
  • Published : 2011.03.27
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Abstract

Nanosized Pt, Pt-Ru and Pt-$CeO_2$ electrocatalysts supported on acid-treated carbon nanotube (CNT) were synthesized by microwave-assisted heating of polyol process using $H_2Cl_6Pt{\cdot}6H_2O$, $RuCl_3$, $CeCl_3$ precursors, respectively, and were characterized by XRD and TEM. And then the electrochemical activity of methanol oxidation for catalyst/CNT nanocomposite electrodes was investigated. The microwave assisted polyol process produced the nano-sized crystalline catalysts particles on CNT. The size of Pt supported on CNT was 7~12 nm but it decreased to 3~5 nm in which 10wt% sodium acetate was added as a stabilizer during the polyol process. This fine Pt catalyst particles resulted in a higher current density for Pt/CNT electrode. It was also found that 10 nm size of PtRu alloys were formed by polyol process and the onset potential decreased with Ru addition. Cyclic voltammetry analysis revealed that the $Pt_{75}Ru_{25}/CNT$ electrode had the highest electrochemical activity owing to a higher ratio of the forward to reverse anodic peak current. And the chronoamperemetry test showed that $Pt_{75}Ru_{25}$ catalyst had a good catalyst stability. The activity of Pt was also found to be improved with the addition of $CeO_2$.

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References

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