期刊
APPLIED CATALYSIS A-GENERAL
卷 326, 期 2, 页码 194-201出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2007.04.018
关键词
PtRu bimetallic catalyst; DMFC; bi-functional mechanism; EXAFS; core-shell structure
Catalytic material of PtRu nanoparticles supported on carbon (PtRu/C) for direct methanol fuel cells was synthesized by a polyol reduction method. Addition of phosphorus was effective for downsizing PtRu particles and improving their catalytic activity. The activity obtained was six times of that of a commercial catalysis. The samples were analyzed by techniques of X-ray absorption fine structure (XAFS) at Pt L-III-edge and Ru K-edge, transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF). These results indicated a core-shell structure consisting of a Pt-rich core and Ru-rich shell. By examining coordination numbers determined by XAFS analysis, we found a clear correlation between the catalytic activity and the Pt-Ru atomic pair frequency occurring on the particle surface, which supports the bi-functional mechanism. (C) 2007 Published by Elsevier B.V.
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