• effect of support materials on platinum lattice strain and its oxygen reduction activity

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 820
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the oxygen reduction activities of sputter-deposited platinum (pt) thin films of various thicknesses on amorphous carbon (a-c), tungsten oxide (wo3), and titanium oxide (tio2) were examined to investigate the effect of the support materials. an x-ray diffraction analysis showed that the pt lattice constant clearly increased with decreasing pt thickness on the a-c, while it did not change on the wo3 and tio2. the oxygen reduction activity of the catalysts was measured electrochemically in 0.5 mol/l sulfuric acid at 308 k. the measurements showed that the activity of pt/a-c catalysts decreased with the pt thickness. however, decrease of activity was not observed in the pt/wo3 and pt/tio2 catalysts. the correlation between catalytic activity and pt lattice strain was obtained from these results; pt lattice expansion, which was observed on the a-c support, resulted in the decrease of catalytic activity for an oxygen reduction reaction. the metal-oxide support, such as the wo3 and tio2, suppresses the pt lattice expansion and maintains the pt catalytic activity in the case of decreasing pt thickness compared to the a-c support.

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