Abstract
To investigate the effects of the porous structure of carbon support for bimetallic PtRu PEFC anode catalysts on their CO tolerance, a series of Resorcinol-formaldehyde carbon gels with different resorcinol to catalyst (R/C) ratios (i.e., 200, 800 and 1000) were synthesized and used to support Pt2Ru3 nanoparticles. Synthesized catalysts were characterized by powder X-ray diffraction, N2 gas adsorption/desorption experiments, and scanning transmission electron microscopy. CO tolerances were evaluated by using a single cell in a H2 feed in the presence of CO ranging from 100 to 2000 ppm. The potential difference of the cell using Pt2Ru3/RC1000ac58 anode catalyst was 0.655 V whereas the cell using a commercial Pt2Ru3/C catalyst showed a voltage of 0.570 V in the presence of 500 ppm CO. The results reveal that high modal size and volume of mesopore enhance diffusivity of CO resulted in effectively oxidization of CO.
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