| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 43529 | Applied Catalysis A: General | 2007 | 8 Pages |
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 LIII-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”.
Graphical abstractPtRu nanoparticles catalyst supported on carbon was synthesized and analyzed. The results indicated a clear correlation between the catalytic activity and Pt–Ru atomic pair frequency occurring on the particle surface, which support the “bi-functional mechanism”. Figure optionsDownload full-size imageDownload as PowerPoint slide
