Influence on Structure and Composition of Carbon Supported PtCu-LaO_x Composite Membrane Electrode by Acid Treatment

摘要

In order to reduce production cost of Fuel Cells, one of the key points was to reduce Pt loading in Pt/C catalytic electrode. In our study, a new type of Pt/C membrane electrodes, PtCu-LaO_x composite structure, on the surface of carbonaceous substrates was manufactured by Ion Beam Sputtering technology, and also was treated in different concentration H_2SO_4 solution. Phase composition, surface topography and microarea elements of these electrodes were analyzed by X-ray Diffraction, Scanning Electron Microscopy combined with Energy Dispersive Spectrometry, respectively. It was found that PtCu-LaO_x composite membrane with Pt loading less than 0.045mg/cm~2 (the electrode area), and that the orientation growing of Pt(111) and Pt(200) would be promoted, and that Pt-Pt interval on surface of PtCu-LaO_x would reduce owing to Cu was dissolved from (Pt) through H_2SO_4 solution treatment, and that average grain size of PtCu-LaO_x decreased and crystal face spacing steady along with rising concentration.