1. Entering voltage hysteresis in phase-separating materials : revealing the electrochemical signature of the intraparticle phase-separated stateTomaž Katrašnik, Jože Moškon, Klemen Zelič, Igor Mele, Francisco Ruiz-Zepeda, Miran Gaberšček, 2023, original scientific article Abstract: Hysteresis is a general phenomenon regularly observed in various materials. Usually, hysteretic behavior is an intrinsic property that cannot be circumvented in the non-equilibrium operation of the system. Herein, we show that, at least with regard to the hysteretic behavior of phase-separating battery materials, it is possible to enter (deeply) the hysteretic loop at finite battery currents. This newly observed electric response of the electrode, which is inherent to phase-separating materials, is, for the first time, related to its microscopic origin arising from a (significant) share of the active material residing in an intraparticle phase-separated state. This intriguing observation was further generalized by revealing that a phase-separating material can feature (significantly) different chemical potentials at the same bulk lithiation level and temperature when exposed to the same finite current and external voltage hysteresis. Therefore, the intraparticle phase-separated state significantly affected the DC and AC characteristics of the battery. The experimental evidence for entering the intraparticle phase-separated state is supported by thermodynamic reasoning and advanced modeling. The current findings will help advance the understanding, control, diagnostics, and monitoring of batteries composed of phase-separating materials while also providing pertinent motivation for the enhancement of battery design and performance.
Keywords: battery, phase-separating materials, Lithium iron phosphate, voltage hysteresis, intraparticle phase-separated
Published in DiRROS: 06.09.2023; Views: 160; Downloads: 92
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2. Periodic anti-phase boundaries and crystal superstructures in ▫$PtCu_3$▫ nanoparticles as fuel cell electrocatalystsAna Rebeka Kamšek, Anton Meden, Iztok Arčon, Primož Jovanovič, Martin Šala, Francisco Ruiz-Zepeda, Goran Dražić, Miran Gaberšček, Marjan Bele, Nejc Hodnik, 2023, original scientific article Published in DiRROS: 28.08.2023; Views: 211; Downloads: 106
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3. 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: 212; Downloads: 104
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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, review article Keywords: identical location electron microscopy, image analysis, machine learning, electrocatalysis, metallic nanoparticles
Published in DiRROS: 01.07.2022; Views: 410; Downloads: 301
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5. The influence of the plasma-nitriding temperature on the microstructure evolution and surface properties of additive-manufactured 18Ni300 maraging steelMatjaž Godec, Francisco Ruiz-Zepeda, Bojan Podgornik, Črtomir Donik, Aleksandra Kocijan, Danijela Anica Skobir Balantič, 2022, original scientific article Keywords: maraging steel, powder bed fusion, plasma nitriding, microstructure, wear resistance, corrosion resistance
Published in DiRROS: 06.05.2022; Views: 445; Downloads: 139
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6. 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: 1483; Downloads: 1051
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7. 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, original scientific article Keywords: electrocatalysis, in-situ annealing STEM, platinum nanoparticles, electrodes, electrospinning
Published in DiRROS: 26.11.2020; Views: 1586; Downloads: 1055
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8. 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: 1265; Downloads: 905
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9. Mechanisms of copper-based catalyst deactivation during CO [sub] 2 reduction to methanolAnže Prašnikar, Andraž Pavlišič, Francisco Ruiz-Zepeda, Janez Kovač, Blaž Likozar, 2019, original scientific article Keywords: catalyst deactivation, methanol synthesis, deactivation mechanism, modelling
Published in DiRROS: 24.11.2020; Views: 1132; Downloads: 882
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10. 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, original scientific article Keywords: electrocatalysis, dealloying, fuel cells, identical location TEM, kinetic Monte Carlo
Published in DiRROS: 23.11.2020; Views: 1257; Downloads: 953
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