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2. Previous studies have examined Pt coated or Pt alloyed catalysts for improved ORR activity and/or reduced cost. Since the substrate or alloyed metal typically has a lower cost than Pt, normalizing activity to the total metal mass does not adequately demonstrate the cost savings this class of catalyst o ff ers. While this study completed ORR activity analyses in terms of total metal mass and Pt mass, dollar activities were also included to objectively quantify the cost bene fi t of Pt coated copper (Cu) nanowires (Pt/CuNWs). Dollar activities were derived as a cost normalized ORR mass activity and calculated using fi ve year metal price averages (July 2006−2011) for Pt ($1414.7 t oz−1 ), Cu ($ 6.3 t oz−1 ), and silver (Ag, $ 17.3 t oz −1 ). In terms of dollar activity, the DOE mass activity target corresponded to 9.7 A $−1 . 3. Previously, Ag nanowire (AgNW) templated Pt nanotubes (PtNTs (Ag)) were synthesized by galvanically displacing AgNWs and studied for ORR activity. 9,10 Because of low surface area, PtNTs (Ag) are unable to meet the dollar target in their current form. Furthermore, Pt coated AgNWs are impractical as acidic ORR catalysts because of the strong antisegregation energy (theoretically 0.34 eV atom −1 for a Pt impurity on a Ag host). 11 The alloy formation does not allow a complete Pt shell and the presence of Ag is a liability for corrosion fi rst on the surface and then the bulk, eventually destroying the catalyst. |
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