Study of Methanol-tolerant Oxygen Reduction Reaction at Pt–Bi/C Bimetallic Nanostructured Catalysts
✍ Scribed by A. M. Remona; K. L. N. Phani
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 568 KB
- Volume
- 11
- Category
- Article
- ISSN
- 1615-6846
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✦ Synopsis
The nanostructured platinum-bismuth catalysts supported on carbon (Pt 3 Bi/C, PtBi/C and PtBi 3 /C) were synthesised by reducing the aqueous metal ions using sodium borohydride (NaBH 4 ) in presence of a microemulsion. The amount of metal loading on carbon support was found to be 10 wt.-%. The catalyst materials were characterised by X-ray diffraction (XRD), X-ray fluorescence (XRF), transmission electron microscope (TEM) and electroanalytical techniques. The Pt 3 Bi/C, PtBi/C and PtBi 3 /C catalysts showed higher methanol tolerance, catalytic activity for oxygen reduction reaction (ORR) than Pt/C of same metal loading. The elec-trochemical stability of these nano-sized catalyst materials for methanol tolerance was investigated by repetitive cycling in the potential range of -250 to 150 mV MSE . Bi presents an interesting system to have a control over the activity of the surface for MOR and ORR. All Pt-Bi/C catalysts exhibited higher mass activities for oxygen reduction (1-1.5 times) than Pt/C. It was found that PtBi/C catalyst exhibits better methanol-tolerance than the other catalysts.