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ceria and platinum need to be dispersed into a carbon glass or carbon film so that the DMFC electrode can be fabricated and function properly. For this reason, the substrates used for deposition are now the carbon matrices provided by UPR, labeled C1 – C12 in Table 4.2. CeOx/Pt co-depositions are carried out in a similar fashion to the previous depositions. FE-SEM, XPS and XRD are used to characterize the deposited films. A low magnification SEM image, Figure 4.13, shows a uniform CeOx/Pt film deposited on the carbon matrix. A higher magnification, Figure 4.14, reveals CeOx/Pt particles, whose sizes range between 100 – 500 nm, dispersed on top of the carbon matrix. An XPS sputter depth profile, Figure 4.15 (bottom), not only further confirms that the ceria (top left) and platinum (top right) are dispersed across the surface, but dispersed throughout the thickness of the carbon substrate. XRD, Figure 4.16, indicates that platinum is polycrystalline and the ceria is in the +3 state (Ce2O3). 99PDF Image | Supercritical Fluid Deposition Of Thin Metal Films
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