Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (12): 2268-2274.doi: 10.3866/PKU.WHXB20081220

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Structural Effects and Electrooxidation Activity of a Two-Dimensional Multilayer PtRu/PtNd Alloy Nanostructure Thin Film

ZHANG Hong-Wei, ZHANG Zheng-Fu, LI Yang, YANG Xi-Hun, LIU Shuo   

  1. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, P. R. China; Kunming Institute of Precious Metals, Kunming 650221, P. R. China
  • Received:2008-07-21 Revised:2008-09-09 Published:2008-12-04
  • Contact: YANG Xi-Kun

Abstract: The two-dimensional multilayer PtRu/PtNd alloy nanostructure thin film used for anode electrodes of micro-directmethanol fuel cells (DMFCs) was fabricated by multi-target ion beamsputtering (IBS). The surface chemical state, structure, surface layer structure, and morphology of the PtRu/PtNd thin-film were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), grazing incidence X-ray diffraction (GIXD), and atomic force microscope (AFM). Electrochemical properties were examined by CO-stripping voltammetry, cyclic voltammetry (CV), linear sweep voltammetry (LSV), and chronoamperometry (CA). The structure and surface chemical state of the PtRu/PtNd thin film were found to have changed due to a strong interaction between Pt+, Ru+ and Pt+, Nd+ during the ion beamalternate sputtering deposition process. Abnormal peak widths in the XRD spectra as well as electron transfer between Pt and Nd have also been observed. The PtRu/PtNd thin-film is shown to have a special multiphase structure and electronic structure. The electrochemical activity-specific surface area of PtRu/PtNd thin-film was 115.00 m2·g-1, and therefor PtRu/PtNd thin-film catalysts exhibited higher catalytic activity for methanol electrooxidation in an acidic environment.

Key words: Multi-target ion bean sputtering, PtRu/PtNd alloy thin-film, Structural effect, Electrooxidation


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