11. Atomically resolved dealloying of structurally ordered Pt nanoalloy as an oxygen reduction reaction electrocatalystAndraž Pavlišič, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Marjan Bele, Goran Dražić, Iztok Arčon, Samo B. Hočevar, Anton Kokalj, Nejc Hodnik, Miran Gaberšček, original scientific article Abstract: The positive effect of intermetallic ordering of platinum alloy nanoparticles on oxygen reduction reaction (ORR) activity has been well established. What is still missing is an understanding of selective leaching of the less noble metal from the ordered structure and its correlation to longterm ORR performance. Using a combination of kinetic Monte Carlo simulations and advanced characterization techniques, we provide unprecedented insight into dealloying of intermetallic PtCu3 nanoparticles a well-known binary alloy. Comparison of ordered and disordered samples with identical initial compositions and particle size distributions reveals an unexpected correlation: whereas the copper dealloying rates in the ordered and disordered counterparts are almost the same, in the ordered structure Pt atoms are surrounded by 15−30% more Cu atoms throughout all the stages of acid leaching. This more convenient Pt−Cu coordination explains the statistically significant increase of 23−37% in ORR activity of the ordered structure at all stages of alloy degradation.
Keywords: ORR activity, fuel cells, platinum alloy, nanoparticle stability, intermetallic ordering, kinetic Monte Carlo, dealloying, in situ ICP-MS
Published in RUNG: 27.09.2016; Views: 5633; Downloads: 0
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12. Biogas production from brewery yeast in an EGSB reactorGregor Drago Zupančič, Milenko Roš, Miran Klemenčič, Matej Oset, Romana Marinšek-Logar, 2016, professional article Abstract: Experience over a five-year period of full throughput using anaerobic co-digestion of brewery yeast for biogas production is described in this contribution. The brewery, with a total amount of available yeast (0.7 v/v %), had a 26.2 % increase in COD load and a 38.5 % increase in biogas production resulting in an increase in the biomethane/natural gas substitution ratio in the brewery from 10 % to 16 %.
Keywords: Anaerobic digestion, biogas production, brewery yeast, brewery wastewater, EGSB
Published in RUNG: 21.04.2016; Views: 6120; Downloads: 0
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13. Biogaserzeugung aus Brauereihefe in einem EGSB-ReaktorGregor Drago Zupančič, Milenko Roš, Romana Marinšek Logar, Miran Klemečič, Matej Oset, 2015, professional article Abstract: Im vorliegenden Beitrag soll die fünfjährige Erfahrung mit der Co-Vergärung von Brauereihefe für die Erzeugung von Biogas im industriellen Maßstab vorgestellt werden. Der Betrieb mit den gesamten, in der Brauerei anfallenden Heferückständen (0,7 Vol.-%) brachte eine Steigerung der CSB-Fracht von 26,2 Prozent und der Biogaserzeugung von 38,5 Prozent. Infolgedessen erhöhte sich die substitutionsquote Biomethan/Erdgas in der Brauerei von 10 auf 16 Prozent.
Keywords: Brauereihefe, Biomethan, Erdgas, Co-Vergärung
Published in RUNG: 29.03.2016; Views: 4750; Downloads: 0
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