Fabrication and Characterization of High-activity Pt/C Electrocatalysts for Oxygen Reduction
- Fabrication and Characterization of High-activity Pt/C Electrocatalysts for Oxygen Reduction
- 임보라미; 김정운; 황승준; 유성종; 조은애; 임태훈; 김수길
- PEMFC; Pt/C; Polyol; Oxygen reduction; Mass activity
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 31, NO 6, 1577-1582
- A 20 wt % Pt/C is fabricated and characterized for use as the cathode catalyst in a polymer electrolyte membrane fuel cell
(PEMFC). By using the polyol method, the fabrication process is optimized by modifying the carbon addition sequence
and precursor mixing conditions. The crystallographic structure, particle size, dispersion, and activity toward oxygen
reduction of the as-prepared catalysts are compared with those of commercial Pt/C catalysts. The most effective catalyst
is obtained by ultrasonic treatment of ethylene glycol-carbon mixture and immediate mixing of this mixture with a Pt
precursor at the beginning of the synthesis. The catalyst exhibits very uniform particle size distribution without agglomeration.
The mass activities of the as-prepared catalyst are 13.4 mA/mgPt and 51.0 mA/mgPt at 0.9 V and 0.85 V,
respectively, which are about 1.7 times higher than those of commercial catalysts.
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