Platinum-Ruthenium Catalysts, Manufactured by Means of Ion Exchange in Nafion Layers

Abstract

Catalytic layers of platinum-ruthenium of preliminarily specified compositions are manufactured with the aid of ion exchange and subsequent chemical and electrochemical reduction in polymeric Nafion films applied onto carbonaceous materials and inside a standard Nafion 117 membrane. The procedure used for conducting the ion-exchange procedure ensures a high process rate and a short time required to conduct it, which makes it possible to obtain large roughness factors at relatively small contents of platinum metals (0.1-0.2 mg cm -2 ). The electrochemical activity of catalyzed membrane samples for methanol oxidation in aqueous and sulfuric acid solutions is close to the activity of standard E-TEK platinum-ruthenium catalysts.

Fabrication and electrochemical characterization of Pt–Pd impregnated nanocomposite polymer electrolyte membranes for high concentration DMFCs

“…Hence, Pt-Pd ratio in membrane possibly equal to those in the solution 3 . In contrast, increasing the content of platinum atomic fraction in the deposition layer is observed, this may be due to some unaccounted losses during sample preparations and transferring Pt-Pd into solution 22 .…”