Electrocatalytic Activities of Pt/C and PtRu/C Prepared Using Colloidal Precursor Technique.
Date Issued
2009
Date
2009
Author(s)
Ho, Pei-Wen
Abstract
Platinum and platinum-ruthenium alloy catalysts on carbon were prepared by colloidal precursor technique. The adsorption of CO and its effect on the hydrogen oxidation reaction on the catalyst were investigated by cyclic voltammetry (CV) and the rotating disk electrode (RDE) techniques. PtCl2, RuCl3 and N(oct4)[ Bet3H] were used to prepared the catalysts. The particle sizes of Pt and PtRu for 5.4~27.2 wt% Pt/C and 6.5~26.6 wt% PtRu/C prepared, determined by X-ray diffraction and transmission electron microscope, were in the range of 3.1~8.9 nm and 2.6~3.3 nm, respectively, which are slightly larger than those of commercial catalysts. By reducing the electro-active surface area of the catalyst through the adsorption of CO, the current density in the catalyst layer and thus the exchange current density for hydrogen oxidation reaction on the catalyst can be measured using the rotating disk electrode (RDE) method. The exchange current densities of Pt/C and PtRu/C in 0.5M H2SO4 at 28℃ were determined to be 5mAcm-2 and 1.4mAcm-2, respectively. Pt/C had higher electrocatalytic activity for hydrogen oxidation than PtRu/C, but Pt/C was poisioned by CO faster than PtRu/C. The results of this research may contribute to the development of CO-tolerant platinum-based alloy anode catalysts for low-temperature fuel cells.
Subjects
Fuel Cell
Electrocatalyst
Pt-Ru Alloy
CO-tolerance
Energy
Type
thesis
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