Pt−Ru/CeO2/Carbon Nanotube Nanocomposites: An Efficient Electrocatalyst for Direct Methanol Fuel Cells
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- 作者：Zhenyu Sun ; Xiang Wang ; Zhimin Liu ; Hongye Zhang ; Ping Yu ; Lanqun Mao
- 刊名：Langmuir
- 出版年：2010
- 出版时间：July 20, 2010
- 年：2010
- 卷：26
- 期：14
- 页码：12383-12389
- 全文大小：1005K
- 年卷期：v.26,no.14(July 20, 2010)
- ISSN：1520-5827
文摘
Pt−Ru/CeO2/multiwalled carbon nanotube (MWNT) electrocatalysts were prepared using a rapid sonication-facilitated deposition method and were characterized by X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), and voltammetry. Morphological characterization by TEM revealed that CeO2 nanoparticles (NPs) were in intimate contact with Pt−Ru NPs, and both were highly dispersed on the exteriors of nanotubes with a small size and a very narrow size distribution. Compared with the Pt−Ru/MWNT and Pt/MWNT electrocatalysts, the as-prepared Pt−Ru/CeO2/MWNT exhibited a significantly improved electrochemically active surface area (ECSA) and a remarkably enhanced activity toward methanol oxidation. The effects of the Pt−Ru loading and the Pt-to-Ru molar ratio on the electrocatalytic activity of Pt−Ru/CeO2/MWNT for methanol oxidation were investigated. We found that a maximum activity toward methanol oxidation reached at the 10 wt % of Pt−Ru loading and 1:1 of Pt-to-Ru ratio. Moreover, the role of CeO2 in the catalysts for the enhancement of methanol oxidation was discussed in terms of both bifunctional mechanism and electronic effects.