Nanoporous Pt<SUP align="right">n+</SUP>–CeO<SUB align="right">x catalyst films grown on carbon substrates

Abstract

Deposition of the Pt doped cerium oxide catalyst layers on carbon nanotubes and flat carbon substrates by magnetron sputtering leads to growth of solid solution films composed of nanorods oriented perpendicularly to the substrate surface forming fractal like highly porous structure. The films contain only cationic Pt 2+ and Pt 4+ . Cerium oxide is partially reduced. The catalyst films reveal high catalytic activity as anode catalyst in proton exchange membrane fuel cells. Preparation of nanoporous structures by sputtering shows that this technique is suitable for preparation of catalyst for micro fuel cell systems made by planar technology. Prague in 1982. His scientific interests are focused on physical chemistry of surfaces and thin film physics. His research activities performed during last five years cover mainly development and investigation of ceria based model and real catalysts for low temperature CO oxidation and proton exchange membrane fuel cell catalysts. Roman Fiala obtained his Master's degree from Charles University in Prague in 2010. Since 2010, he has been PhD student at Nanoporous Pt n+ -CeO x catalyst films grown on carbon substrates 681 in Prague. His research is focused on development of catalyst layer for low-temperature fuel cell technology. Ivan Khalakhan finished his Master's degree studies

Growth and composition of nanostructured and nanoporous cerium oxide thin films on a graphite foil

“…The prepared layers have exhibited a complex porous columnar structure with an increased active surface of the catalyst compared to a relatively flat layer deposited on a silicon substrate. 25,26,28,[36][37][38][39] In very recent reports, 40,41 we have shown that the morphology of the nanostructured ceria layers can be tuned by different preparation conditions, mainly by the working gas composition, r.f. discharge power and deposition time.…”

Maximum Noble‐Metal Efficiency in Catalytic Materials: Atomically Dispersed Surface Platinum

“…Recently, we have shown that highly porous coatings can be prepared by magnetron sputtering implying a high application potential in catalysis. [23] Most interestingly, dispersed Pt-CeO 2 composites with any Pt:Ce ratio can be prepared by cosputtering, in direct analogy to the model catalysts discussed above. We have also demonstrated the promising properties of the Pt-CeO 2 coating as electrocatalysts in proton exchange membrane fuel-cell technology, specifically their superior noble metal efficiency.…”

“…We have also demonstrated the promising properties of the Pt-CeO 2 coating as electrocatalysts in proton exchange membrane fuel-cell technology, specifically their superior noble metal efficiency. [22,23] Recently we compared Pt-CeO 2 anodes with different Pt loadings between 0 and 10 mg Pt/cm 2 (see Supporting Information) The highest performance was shown for the catalyst with 2 mg Pt/cm 2 which contained Pt 2+ ions only. For higher loading, Pt was in both the Pt 2+ and the Pt 0 state and the performance of the catalyst was lower (Supporting Information, Figure S5).…”