Effect of the Sulfur Removal in Manufacturing Pt/C Electrocatalysts on the Performance of Phosphoric Acid Fuel Cell

인산형 연료전지용 백금촉매제조에서 황의 제거에 따른 전극 성능

  • Shim, Jae-Cheol (Department of Industrial Chemistry, College of Engineering, Hanyang University) ;
  • Lee, Kyung-Jik (Department of Industrial Chemistry, College of Engineering, Hanyang University) ;
  • Lee, Ju-Seong (Department of Industrial Chemistry, College of Engineering, Hanyang University)
  • 심재철 (한양대학교 공과대학 공업화학과) ;
  • 이경직 (한양대학교 공과대학 공업화학과) ;
  • 이주성 (한양대학교 공과대학 공업화학과)
  • Received : 1997.11.10
  • Accepted : 1998.04.06
  • Published : 1998.08.10


Pt/C powder which was used as electrocatalyst in a Phosphoric Acid Fuel Cell(PAFC) was fabricated by colloid method. It was reported that the sulfur from reductant, $Na_2S_2O_4$, worked as a poison against catalyst during long term operation. To remove these sulfurs, we try to treat Pt/C powder by three different methods. First, we tried to remove the sulfur according to temperature and time in $H_2$ atmosphere. As the heat treatment temperature is raised up, the effect of the removal is increased but the electrode performance is decreased because of the growth of Pt particle size. The optimal heat treatment temperature is $400^{\circ}C$, the size of Pt particle is approximately $35{\sim}40{\AA}$ and the electrode performance is $360mA/cm^2$ at 0.7 V. At $400^{\circ}C$, even though the time of heat treatment is extended, size of Pt, amounts of remaining sulfur and electrode performance is almost constant. Secondly, when we removed in a crucible at $900^{\circ}C$ the removal of the sulfur was not better, but the size of Pt particle, approximately $80{\AA}$, was smaller than that of heat treatment in $H_2$ atmosphere at $900^{\circ}C$. Lastly we treated with solvents such as acetone, benzene, and carbon disulfide. It was observed that sulfur components were removed partly by extraction with solvents, the electrode performances were similar each other.



Supported by : 통상산업부


  1. Electrochimica Acta. v.23 K. F. Blurton;H. R. Kunz;D. R. Rutt
  2. Phil. Mag. v.15 W. R. Grove
  3. J. of Korean Ind. & Eng. Chemistry v.3 Yeong-Woo Kim;Ju-Seong Lee
  4. The Merck Index, 11th Merck & Co. Inc.
  5. Handbook of Batteries and Fuel Cell D. Linden
  6. J. Applied Electrochemistry v.20 S. Mukerjee
  7. J. Chem. Phys. v.58 H. P. Bonzel;R. Ku
  8. J. Applied Electrochemistry v.19 D. T. Chin;H. H. Chang
  9. Surface Sci. v.81 S. R. Kelemen;T. E. Fischer;J. A. Schwarz
  10. J. Catal. v.53 W. Erley;H. Wagner
  11. J. of Korean Ind. & Eng. Chemistry v.4 Yeong-Woo Kim;Ju-Seong Lee
  12. J. Electochem. Soc. v.140 Kyong Tae Kim;Jung Tae Hwang;Young Gul Kim;Jong Shik Chung
  13. J. Electrochem. Soc. v.137 A. Honji;T. Mori;Y. HIshinuma
  14. Adv Catal. Rel Subj v.27 M. Shelef;K. Otto;N. C. Otto