Preparation and Characterization of Advanced PtRu/Ti_(0.7)Mo_(0.7)O_2 Catalysts for Direct Methanol Fuel Cells

摘要

We report the new strategy by investigating the novel Ti_(0.7)Mo_(0.3)O_2 material can just as easily be used as a conductive support for PtRu for DMFCs to prevent not only the carbon corrosion but also improved activity of catalyst due to some functional advantages of novel Ti_(0.7)Mo_(0.3)O_2 support. The Ti_(0.7)Mo_(0.3)O_2 nanoparticle have good crystallinity with well-defined fringes corresponding to the 3.45 A spacing value of the {101} plane of anatase TiO_2, which were good according to the XRD pattern. The BET surface area measurements showed that the Ti_(0.7)Mo_(0.3)O_2 possessed 125 m~2 g~(-1) Fig. 3 shows the TEM measurement of Ti_(0.7)Mo_(0.3)O_2 nanoparticle and Pt/Ti_(0.7)Mo_(0.3)O_2, it can be observed that spherical PtRu alloy particles with an average particle size of 2-4 nm were uniformly anchored on the surface of Ti_(0.7)Mo_(0.3)O_2 support. More importantly, we found that there has a strong metal support interaction (SMSI) between the PtRu noble metal and the Ti_(0.7)Mo_(0.3)O_2 support material - resulting in facile electron donation from the Ti_(0.7)Mo_(0.3)O_2 support to PtRu metal with an ultimate drastic decrease in the d-band vacancy of Pt. Thus, the unique structural features of the Ti_(0.7)Mo_(0.3)O_2 support and the PtRu/Ti_(0.7)Mo_(0.3)O_2 catalyst appear to provide a suitable combination favoring that promise for the high performance of methanol oxidation, CO-tolerance in DMFCs.