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3600 2500 1600 900 400 100 Control Control Pt Ce2O3 <311> <212> Pt <220> Control Intensity (counts) Pt Ce2O3 <111><102> Pt Ce2O3 <200> <110> 0 10 20 30 40 50 60 70 80 90 2Theta (°) Figure 4.16: XRD comparison of samples C14 – C18. All samples show polycrystalline platinum peaks and indicate that ceria is also polycrystalline in the +3 state (Ce2O3). The samples are then sent to UPR for electrochemical measurements. The electrical testing results of sulfuric acid cyclic voltammetry and methanol oxidation are used to evaluate which process of ceria and platinum deposition yielded the optimum catalytic activity are reported in Table 4.3. A result of “partial” indicates that there is an observable activity, however it is negligible. These “partial” results correspond to films from single depositions. It is found that subsequent depositions of Pt and Ce yielded the optimum films due to the greatest catalytic activity. It is therefore proposed that the multiple depositions allow for higher concentration of catalytic material to be deposited, thereby increasing the catalytic activity of the electrode. 102PDF Image | Supercritical Fluid Deposition Of Thin Metal Films
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