1. Insights into surface microstructural engineering of Inconel 625 for enhanced oxygen evolution reaction performanceLuka Suhadolnik, Črtomir Donik, Blaž Tomc, Mejrema Nuhanović, Martin Šala, Marjan Bele, Matjaž Finšgar, Andraž Mavrič, Iztok Arčon, Matjaž Godec, Nejc Hodnik, 2025, izvirni znanstveni članek Ključne besede: electrocatalysis, compositionally complex materials, commercial nickel alloys, oxygen evolution reaction, scanning electron microscopy, IL-SEM
Objavljeno v DiRROS: 29.10.2025; Ogledov: 241; Prenosov: 120
 Celotno besedilo (16,20 MB)
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2. Workflow and practical guidance for identical location scanning electron microscopy: reliable tracking of localized transformationsBlaž Tomc, Marjan Bele, Ana Rebeka Kamšek, Milena Martins, Aleš Marsel, Miha Hotko, Stefan Popović, Gregor Kapun, Črtomir Donik, Mitja Kostelec, Matjaž Godec, Nejc Hodnik, Luka Suhadolnik, 2025, izvirni znanstveni članek Povzetek: Understanding material transformations at the nano- and microscale is essential for advancing electrocatalysis, energy storage, and other applications. Conventional SEM imaging, which captures random locations before and after treatment, struggles to distinguish real transformations from inherent sample heterogeneity. Identical Location SEM (IL-SEM) overcomes this by enabling re-imaging of the exact same region, offering clear evidence of localized changes in morphology, structure, and composition. Despite its simplicity and wide applicability, IL-SEM remains underutilized. This article presents a detailed, practical guide to implementing IL-SEM reliably, including sample alignment, multiscale imaging, and consistent re-localization. Key methodological tips and solutions to common challenges are provided, making the approach accessible even for non-expert users. To showcase its versatility, we present case studies involving electrocatalysts, alloys, and nanostructured materials. Moreover, by integrating IL-SEM with energy-dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD), we demonstrate how compositional and crystallographic evolution can be tracked alongside morphological changes. This optimized workflow offers a powerful, non-destructive method for visualizing dynamic material behavior and provides a foundation for IL-SEM to become a standard technique for studying structural evolution across diverse materials research fields.
Ključne besede: electrocatalysis, identical location electron microscopy, IL-SEM, materials characterization, scanning electron microscopy, surface analysis
Objavljeno v DiRROS: 15.10.2025; Ogledov: 283; Prenosov: 141
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3. Functionalization of FeCoNiCu medium entropy alloy via nitridation and anodic oxidation for enhanced oxygen evolution and glycerol oxidationLuka Suhadolnik, Milutin Smiljanić, Marjan Bele, Mejrema Nuhanović, Matjaž Finšgar, Nik Maselj, Daniela Neumüller, Lidija D. Rafailović, Nejc Hodnik, 2025, izvirni znanstveni članek Povzetek: Medium entropy alloys (MEAs) have emerged as a promising class of materials for electro-catalysis due to their tunableproperties and exceptional catalytic performance. This study successfully functionalized a bulk FeCoNiCu alloy using a combined anodic oxidation (AO) and nitridation (NT) approach to produce a highly porous, thin-film catalyst. The hierarchical structure formed during the surface treatments enhances the material's specific surface area and alters the oxidation states of the constituent metals, creating abundant active sites. The electrocatalytic performance of themodified bulk FeCoNiCu electrode was evalu-ated for both the oxygen evolution reaction (OER) and glycerol oxidation reaction (GOR) in an alkaline electrolyte. Remarkably, the AO-NT-treated catalyst exhibited superior activity for OER, surpassing commercial IrOx benchmarks with lower overpotential requirements. For GOR, the FeCoNiCu electrode demonstrated excellent performance by significantly reducing energy input compared to OER, highlighting its potential as a dual-purpose catalyst for alkaline water splitting. Post-reaction product analysis via NMR confirmed the formation of value-added chemicals, with formic acid identified as the main product. These results underline the feasibility of surface-modified MEAs for sustainable energy and chemical production applications, offering a cost-effective alternative to noble metal-based catalysts.
Ključne besede: medium entropy alloy, surface modification, electrocatalysis, oxygen evolution reaction, glycerol oxidation
Objavljeno v DiRROS: 10.04.2025; Ogledov: 639; Prenosov: 348
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4. Bringing into play automated electron microscopy data processing for understanding nanoparticulate electrocatalysts’ structure–property relationshipsAna Rebeka Kamšek, Francisco Ruiz-Zepeda, Andraž Pavlišič, Armin Hrnjić, Nejc Hodnik, 2022, pregledni znanstveni članek Ključne besede: identical location electron microscopy, image analysis, machine learning, electrocatalysis, metallic nanoparticles
Objavljeno v DiRROS: 01.07.2022; Ogledov: 1928; Prenosov: 1133
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5. Assembly of Pt nanoparticles on graphitized carbon nanofibers as hierarchically-structured electrodesNejc Hodnik, Luigi Romano, Primož Jovanovič, Francisco Ruiz-Zepeda, Marjan Bele, Filippo Fabbri, Luana Persano, Andrea Camposeo, Dario Pisignano, 2020, izvirni znanstveni članek Ključne besede: electrocatalysis, in-situ annealing STEM, platinum nanoparticles, electrodes, electrospinning
Objavljeno v DiRROS: 26.11.2020; Ogledov: 3244; Prenosov: 1778
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6. 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, izvirni znanstveni članek Ključne besede: electrocatalysis, bifunctional electrocatalysts, oxygen evolution reaction, oxygen reduction reaction, IL-TEM, IL-SEM, EFC-ICP-MS
Objavljeno v DiRROS: 24.11.2020; Ogledov: 2902; Prenosov: 1695
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7. Atomically resolved anisotropic electrochemical shaping of nano-electrocatalystFrancisco Ruiz-Zepeda, Matija Gatalo, Andraž Pavlišič, Goran Dražić, Primož Jovanovič, Marjan Bele, Miran Gaberšček, Nejc Hodnik, 2019, izvirni znanstveni članek Ključne besede: electrocatalysis, dealloying, fuel cells, identical location TEM, kinetic Monte Carlo
Objavljeno v DiRROS: 23.11.2020; Ogledov: 2723; Prenosov: 1700
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