11. Mechanistic study of fast performance decay of PtCu alloy-based catalyst layers for polymer electrolyte fuel cells through electrochemical impedance spectroscopyMaximilian Grandi, Matija Gatalo, Ana Rebeka Kamšek, Gregor Kapun, Kurt Mayer, Francisco Ruiz-Zepeda, Martin Šala, Bernhard Marius, Marjan Bele, Nejc Hodnik, Merit Bodner, Miran Gaberšček, Viktor Hacker, 2023, original scientific article Keywords: PEFC, catalyst layer, platinum–copper, degradation, ionomer, electrochemical impedance spectroscopy, membrane electrode assembly Published in DiRROS: 23.06.2023; Views: 359; Downloads: 186 Full text (2,26 MB) This document has many files! More... |
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13. Characterization of fresh PM deposits on calcareous stone surfaces : seasonality, source apportionment and soiling potentialMonika Ogrizek, Asta Gregorič, Matic Ivančič, Daniele Contini, Urša Skube, Kristijan Vidović, Marjan Bele, Martin Šala, Marta Klanjšek Gunde, Martin Rigler, Eva Menart, Ana Kroflič, 2023, original scientific article Published in DiRROS: 24.11.2022; Views: 605; Downloads: 419 Full text (1,40 MB) This document has many files! More... |
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16. Controlled growth of ZnO nanoparticles using ethanolic root extract of Japanese knotweed : photocatalytic and antimicrobial propertiesMiha Ravbar, Ajda Kunčič, Lev Matoh, Sonja Smole Možina, Martin Šala, Andraž Šuligoj, 2022, original scientific article Abstract: Synthesis of zinc oxide (ZnO) nanoparticles (NPs) was mediated by plant extracts to assist in the reduction of zinc atoms during the synthesis and act as a capping agent during annealing.The preparation used ethanolic extracts from the roots of Japanese knotweed (Fallopia japonica). Two major outcomes could be made. (i)A synergistic effect of multiple polyphenolic components in the extract is needed to achieve the capping effect of crystallite growth during thermal annealing at 450 °C characterized by an exponential growth factor (n) of 4.4 compared to n = 3 for bare ZnO. (ii) Synergism between the ZnO NPs and plant extracts resulted in superior antimicrobial activity against both Gram-positive bacteria, e.g., Staphylococcus aureus, and Gram-negative bacteria, e.g., Escherichia coli and Campylobacter jejuni. The materials were also tested for their antimicrobial activity against S. aureus under ultraviolet (UV) illumination. Also here, the photocatalyst prepared with plant extracts was found to be superior. The residues of the plant extract molecules on the surface of the catalyst were identified as the main cause of the observed differences, as proved by thermal gravimetry. Such a preparation using ethanolic extract of Fallopia japonica could serve as a more controlled synthesis of ZnO and potentially other metal oxides, with low environmental impact and high abundance in nature. Published in DiRROS: 21.11.2022; Views: 442; Downloads: 209 Full text (1,75 MB) This document has many files! More... |
17. Electrochemical stability and degradation mechanisms of commercial carbon-supported gold nanoparticles in acidic mediaMilutin Smiljanić, Urša Petek, Marjan Bele, Francisco Ruiz-Zepeda, Martin Šala, Primož Jovanovič, Miran Gaberšček, Nejc Hodnik, 2021, original scientific article Published in DiRROS: 22.01.2021; Views: 1657; Downloads: 1142 Full text (9,88 MB) This document has many files! More... |
18. Synthesis and advanced electrochemical characterization of multifunctional electrocatalytic composite for unitized regenerative fuel cellLeonard Moriau, Marjan Bele, Alen Vižintin, Francisco Ruiz-Zepeda, Urša Petek, Primož Jovanovič, Martin Šala, Miran Gaberšček, Nejc Hodnik, 2019, original scientific article Keywords: electrocatalysis, bifunctional electrocatalysts, oxygen evolution reaction, oxygen reduction reaction, IL-TEM, IL-SEM, EFC-ICP-MS Published in DiRROS: 24.11.2020; Views: 1455; Downloads: 985 Full text (3,51 MB) This document has many files! More... |
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20. Comparison of Pt-Cu/C with benchmark Pt-Co/C : metal dissolution and their surface interactionsMatija Gatalo, Primož Jovanovič, Urša Petek, Martin Šala, Vid Simon Šelih, Francisco Ruiz-Zepeda, Marjan Bele, Nejc Hodnik, Miran Gaberšček, 2019, original scientific article Keywords: oxygen reduction reaction, proton exchange membrane fuel cell, platinum alloy, metal dissolution, electrochemical flow cell coupled to inductively coupled plasma mass spectrometer Published in DiRROS: 23.11.2020; Views: 1457; Downloads: 1086 Full text (4,12 MB) This document has many files! More... |