Structure and Composition of supported PtCu-LaOx Composite Multi-layer Membrane Electrode

摘要

In order to reduce production cost of Fuel Cells, a new type of Pt/C membrane electrodes --PtCu-LaOx, LaOx-PtGu and PtCu-LaOx-PtCu composite multi-layer membrane electrodes - would be raised, in which with developing different membranous layer form dispersed on the surface of carbonaceous or monocrystalline silicon substrates were manufactured by Ion Beam Sputtering technology. Phase composition, micro-area surface topography and elements of these electrodes were analyzed by X-ray Diffraction, Scanning Electron Microscopy combined with Energy Dispersive Spectrometry and Atomic Force Microscope, respectively. It was found that doping La could not only enhance Pt crystallization and decrease Pt grain size but also contribute to Pt(111) preferential orientation growing in the LaOx-PtCu, and that biggish ratio of La(At%) : Pt(At%) in micro-area would be difficult of occurring particles reunion on PtCu-LaOx surface, and that the orientation growing of Pt(200), Pt(220) and Pt(311) would be restrained in PtCu-LaOx and PtCu-LaOx-PtCu, and that the Pt alloy particle exhibited more homogeneous distribution and less size in PtCu-LaOx-PtCu. Our study indicated that these new types of membrane electrodes could be used in Fuel Cells and make Fuel Cells as a new power source for electrical vehicles.