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170 results on '"Jovanovič, Primož"'

2. List of contributors

Author

Clematis, Davide, primary, Escamilla, Yael Ramírez, additional, Ferguson, James, additional, Flox, Cristina, additional, Franceschini, Esteban Andrés, additional, (Persson) Frost, Maja, additional, García, Gonzalo, additional, García, Janet Ledesma, additional, García, Juan Carlos Jiménez, additional, Gatalo, Matija, additional, Gurrola, Mayra Polett, additional, Hodnik, Nejc, additional, Hogg, David, additional, Hrnji, Armin, additional, Hurtado, Luis Gerardo Arriaga, additional, Jovanovič, Primož, additional, Lagunes, Fabiola Ilian Espinosa, additional, Lara, Yonathan Salazar, additional, Leung, Puiki, additional, Linares, José J., additional, Loiacono, Antonella, additional, Luis-Sunga, Maximina, additional, Maselj, Nik, additional, Matera, Fabio, additional, Mignard, Dimitri, additional, Mondal, Subrata, additional, Monllor-Satoca, Damián, additional, Ruiz-Martínez, Débora, additional, Sangaranarayanan, M.V., additional, Santiago, Elisabete I., additional, Smiljani, Milutin, additional, Velpula, Divya, additional, Villalpando, Ricardo Antonio Escalona, additional, Yuan, Gao, additional, and Zavala, Arturo Rico, additional

Published
2024
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11. Metal–Support Interaction between Titanium Oxynitride and Pt Nanoparticles Enables Efficient Low-Pt-Loaded High-Performance Electrodes at Relevant Oxygen Reduction Reaction Current Densities

Author

Hrnjić, Armin, primary, Kamšek, Ana Rebeka, additional, Bijelić, Lazar, additional, Logar, Anja, additional, Maselj, Nik, additional, Smiljanić, Milutin, additional, Trputec, Jan, additional, Vovk, Natan, additional, Pavko, Luka, additional, Ruiz-Zepeda, Francisco, additional, Bele, Marjan, additional, Jovanovič, Primož, additional, and Hodnik, Nejc, additional

Published
2024
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14. “Nano Lab” Advanced Characterization Platform for Studying Electrocatalytic Iridium Nanoparticles Dispersed on TiOxNy Supports Prepared on Ti Transmission Electron Microscopy Grids

Author

Bele, Marjan, primary, Podboršek, Gorazd Koderman, additional, Lončar, Anja, additional, Jovanovič, Primož, additional, Hrnjić, Armin, additional, Marinko, Živa, additional, Kovač, Janez, additional, Surca, Angelja Kjara, additional, Kamšek, Ana Rebeka, additional, Dražić, Goran, additional, Hodnik, Nejc, additional, and Suhadolnik, Luka, additional

Published
2023
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18. Nanotubular TiOxNy-Supported Ir Single Atoms and Clusters as Thin-Film Electrocatalysts for Oxygen Evolution in Acid Media

Author

Suhadolnik, Luka, primary, Bele, Marjan, additional, Čekada, Miha, additional, Jovanovič, Primož, additional, Maselj, Nik, additional, Lončar, Anja, additional, Dražić, Goran, additional, Šala, Martin, additional, Hodnik, Nejc, additional, Kovač, Janez, additional, Montini, Tiziano, additional, Melchionna, Michele, additional, and Fornasiero, Paolo, additional

Published
2023
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22. Towards electrochemical iridium recycling in acidic media

Author

Moriau, Leonard, Stojanovski, Kevin, Jovanovič, Primož, EscaleraLópez, Daniel, Cherevko, Serhiy, and Hodnik, Nejc

Subjects
korozija, iridij, raztapljanje, udc:544.5/.6, elektroliti, elektrokemija, elektrokemija, plemenite kovine, iridij, elektroliti, korozija, raztapljanje, plemenite kovine
Abstract

Nasl. z nasl. zaslona. Opis vira z dne 3. 4. 2023. Bibliografija: str. 7986-7987. Abstract.

Published
2023

24. Benchmarking Fuel Cell Electrocatalysts Using Gas Diffusion Electrodes: Inter-lab Comparison and Best Practices

Author

Ehelebe, Konrad, Schmitt, Nicolai, Sievers, Gustav, Jensen, Anders W., Hrnjić, Armin, Collantes Jiménez, Pablo, Kaiser, Pascal, Geuß, Moritz, Ku, Yu-Ping, Jovanovič, Primož, Mayrhofer, Karl J. J., Etzold, Bastian, Hodnik, Nejc, Escudero-Escribano, María, Arenz, Matthias, and Cherevko, Serhiy

Subjects
Fuel Technology, Renewable Energy, Sustainability and the Environment, Chemistry (miscellaneous), Materials Chemistry, ddc:333.7, Energy Engineering and Power Technology
Abstract

Due to hydrogen’s excellent energy density, proton exchange membrane fuel cells (PEMFC) are very promising to power CO2-free long distance and heavy-duty transport. However, high loadings of scarce and expensive Pt group metals (PGM) are still needed at the cathode to overcome its sluggish oxygen reduction reaction (ORR) kinetics. Replacement or reduction of the noble metal content is obligatory to achieve cost-effective and broadly implemented fuel cell applications. Tremendous effort has been made to optimize the intrinsic activity of PGM catalyst materials mainly by alloying (esp. with Co or Ni) or changing the shape and morphology of nanoparticles. 1-3 Additionally, electrocatalysts based on non-PGM materials have been introduced as earth abundant and cheap alternatives. 3, 4 Nevertheless, the extremely promising activities of all these materials achieved in an ideal rotating disk electrode (RDE) environment cannot (yet) be transferred to technologically relevant membrane electrode assemblies (MEAs). 5-8

Published
2022

25. Iridium Stabilizes Ceramic Titanium Oxynitride Support for Oxygen Evolution Reaction

Author

Koderman Podboršek, Gorazd, primary, Suhadolnik, Luka, additional, Lončar, Anja, additional, Bele, Marjan, additional, Hrnjić, Armin, additional, Marinko, Živa, additional, Kovač, Janez, additional, Kokalj, Anton, additional, Gašparič, Lea, additional, Surca, Angelja Kjara, additional, Kamšek, Ana Rebeka, additional, Dražić, Goran, additional, Gaberšček, Miran, additional, Hodnik, Nejc, additional, and Jovanovič, Primož, additional

Published
2022
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27. Benchmarking Fuel Cell Electrocatalysts Using Gas Diffusion Electrodes:Inter-lab Comparison and Best Practices

Author

Ehelebe, Konrad, Schmitt, Nicolai, Sievers, Gustav, Jensen, Anders W., Hrnjić, Armin, Collantes Jiménez, Pablo, Kaiser, Pascal, Geuß, Moritz, Ku, Yu Ping, Jovanovič, Primož, Mayrhofer, Karl J.J., Etzold, Bastian, Hodnik, Nejc, Escudero-Escribano, María, Arenz, Matthias, Cherevko, Serhiy, Ehelebe, Konrad, Schmitt, Nicolai, Sievers, Gustav, Jensen, Anders W., Hrnjić, Armin, Collantes Jiménez, Pablo, Kaiser, Pascal, Geuß, Moritz, Ku, Yu Ping, Jovanovič, Primož, Mayrhofer, Karl J.J., Etzold, Bastian, Hodnik, Nejc, Escudero-Escribano, María, Arenz, Matthias, and Cherevko, Serhiy

Published
2022

28. Suppressing platinum electrocatalyst degradation via a high-surface-area organic matrix support

Author

Ministry of Higher Education Scientific and Technology (Slovenia), European Commission, European Research Council, North Atlantic Treaty Organization, Slovenian Research Agency, Smiljanić, Milutin, Bele, Marjan, Moriau, Léonard Jean, Vélez Santa, John Fredy, Menart, Svit, Šala, Martin, Hrnjić, Armin, Jovanovič, Primož, Ruiz-Zepeda, Francisco, Gaberšček, Miran, Hodnik, Nejc, Ministry of Higher Education Scientific and Technology (Slovenia), European Commission, European Research Council, North Atlantic Treaty Organization, Slovenian Research Agency, Smiljanić, Milutin, Bele, Marjan, Moriau, Léonard Jean, Vélez Santa, John Fredy, Menart, Svit, Šala, Martin, Hrnjić, Armin, Jovanovič, Primož, Ruiz-Zepeda, Francisco, Gaberšček, Miran, and Hodnik, Nejc

Abstract

Degradation of carbon-supported Pt nanocatalysts in fuel cells and electrolyzers hinders widespread commercialization of these green technologies. Transition between oxidized and reduced states of Pt during fast potential spikes triggers significant Pt dissolution. Therefore, designing Pt-based catalysts able to withstand such conditions is of critical importance. We report here on a strategy to suppress Pt dissolution by using an organic matrix tris(aza)pentacene (TAP) as an alternative support material for Pt. The major benefit of TAP is its potential-dependent conductivity in aqueous media, which was directly evidenced by electrochemical impedance spectroscopy. At potentials below ∼0.45 VRHE, TAP is protonated and its conductivity is improved, which enables supported Pt to run hydrogen reactions. At potentials corresponding to Pt oxidation/reduction (>∼0.45 VRHE), TAP is deprotonated and its conductivity is restricted. Tunable conductivity of TAP enhanced the durability of the Pt/TAP with respect to Pt/C when these two materials were subjected to the same degradation protocol (0.1 M HClO4 electrolyte, 3000 voltammetric scans, 1 V/s, 0.05–1.4 VRHE). The exceptional stability of Pt/TAP composite on a nanoscale level was confirmed by identical location TEM imaging before and after the used degradation protocol. Suppression of transient Pt dissolution from Pt/TAP with respect to the Pt/C benchmark was directly measured in a setup consisting of an electrochemical flow cell connected to inductively coupled plasma-mass spectrometry.

Published
2022

30. Corrigendum to “Observing, tracking and analysing electrochemically induced atomic-scale structural changes of an individual Pt-Co nanoparticle as a fuel cell electrocatalyst by combining modified floating electrode and identical location electron microscopy” [Electrochimica Acta 388 (2021) 138513]

Author

Hrnjic, Armin, Kamšek, Ana Rebeka, Pavlišič, Andraž, Šala, Martin, Bele, Marjan, Moriau, Leonard, Gatalo, Matija, Ruiz-Zepeda, Francisco, Jovanovič, Primož, and Hodnik, Nejc

Published
2022
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32. “Nano Lab” Advanced Characterization Platform for Nanoscale Understanding and Development of Electrocatalysts

Author

Bele, Marjan, primary, Koderman Podboršek, Gorazd, additional, Lončar, Anja, additional, Jovanovič, Primož, additional, Hrnjić, Armin, additional, Marinko, Živa, additional, Kovač, Janez, additional, Surca, Angelja Kjara, additional, Kamšek, Ana Rebeka, additional, Dražić, Goran, additional, Hodnik, Nejc, additional, and Suhadolnik, Luka, additional

Published
2022
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35. Enhancing Iridium Nanoparticles’ Oxygen Evolution Reaction Activity and Stability by Adjusting the Coverage of Titanium Oxynitride Flakes on Reduced Graphene Oxide Nanoribbons’ Support

Author

Moriau, Léonard, primary, Koderman Podboršek, Gorazd, additional, Surca, Angelja Kjara, additional, Semsari Parpari, Sorour, additional, Šala, Martin, additional, Petek, Urša, additional, Bele, Marjan, additional, Jovanovič, Primož, additional, Genorio, Bostjan, additional, and Hodnik, Nejc, additional

Published
2021
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37. Suppressing Platinum Electrocatalyst Degradation via a HighSurface-Area Organic Matrix Support

Author

Smiljanić, Milutin Lj., Bele, Marjan, Moriau, Léonard Jean, Vélez Santa, John Fredy, Menart, Svit, Šala, Martin, Hrnjić, Armin, Jovanovič, Primož, Ruiz-Zepeda, Francisco, Gaberšček, Miran, Hodnik, Nejc, Smiljanić, Milutin Lj., Bele, Marjan, Moriau, Léonard Jean, Vélez Santa, John Fredy, Menart, Svit, Šala, Martin, Hrnjić, Armin, Jovanovič, Primož, Ruiz-Zepeda, Francisco, Gaberšček, Miran, and Hodnik, Nejc

Abstract

Degradation of carbon-supported Pt nanocatalysts in fuel cells and electrolyzers hinders widespread commercialization of these green technologies. Transition between oxidized and reduced states of Pt during fast potential spikes triggers significant Pt dissolution. Therefore, designing Pt-based catalysts able to withstand such conditions is of critical importance. We report here on a strategy to suppress Pt dissolution by using an organic matrix tris(aza)pentacene (TAP) as an alternative support material for Pt. The major benefit of TAP is its potential-dependent conductivity in aqueous media, which was directly evidenced by electrochemical impedance spectroscopy. At potentials below ∼0.45 VRHE, TAP is protonated and its conductivity is improved, which enables supported Pt to run hydrogen reactions. At potentials corresponding to Pt oxidation/reduction (>∼0.45 VRHE), TAP is deprotonated and its conductivity is restricted. Tunable conductivity of TAP enhanced the durability of the Pt/TAP with respect to Pt/C when these two materials were subjected to the same degradation protocol (0.1 M HClO4 electrolyte, 3000 voltammetric scans, 1 V/s, 0.05-1.4 VRHE). The exceptional stability of Pt/TAP composite on a nanoscale level was confirmed by identical location TEM imaging before and after the used degradation protocol. Suppression of transient Pt dissolution from Pt/TAP with respect to the Pt/C benchmark was directly measured in a setup consisting of an electrochemical flow cell connected to inductively coupled plasma-mass spectrometry.

Published
2021

38. Electrochemical Stability and Degradation Mechanisms of Commercial Carbon-Supported Gold Nanoparticles in Acidic Media

Author

Smiljanić, Milutin Lj., Petek, Urša, Bele, Marjan, Ruiz-Zepeda, Francisco, Šala, Martin, Jovanovič, Primož, Gaberšček, Miran, Hodnik, Nejc, Smiljanić, Milutin Lj., Petek, Urša, Bele, Marjan, Ruiz-Zepeda, Francisco, Šala, Martin, Jovanovič, Primož, Gaberšček, Miran, and Hodnik, Nejc

Abstract

Electrochemical stability of a commercial Au/C catalyst in an acidic electrolyte has been investigated by an accelerated stress test (AST), which consisted of 10,000 voltammetric scans (1 V/s) in the potential range between 0.58 and 1.41 VRHE. Loss of Au electrochemical surface area (ESA) during the AST pointed out to the degradation of Au/C. Coupling of an electrochemical flow cell with ICP-MS showed that only a minor amount of gold is dissolved despite the substantial loss of gold ESA during the AST (∼35% of initial value remains at the end of the AST). According to the electrochemical mass spectrometry experiments, carbon corrosion occurs during the AST but to a minor extent. By using identical location scanning electron microscopy and identical location transmission electron microscopy, it was possible to discern that the dissolution of small Au particles (<5 nm) within the polydisperse Au/C sample is the main degradation mechanism. The mass of such particles gives only a minor contribution to the overall Au mass of the polydisperse sample while giving a major contribution to the overall ESA, which explains a significant loss of ESA and minor loss of mass during the AST. The addition of low amounts of chloride anions (10-4 M) substantially promoted the degradation of gold nanoparticles. At an even higher concentration of chlorides (10-2 M), the dissolution of gold was rather effective, which is useful from the recycling point of view when rapid leaching of gold is desirable. © 2021 American Chemical Society.

Published
2021

40. Effect of the Morphology of the High-Surface-Area Support on the Performance of the Oxygen-Evolution Reaction for Iridium Nanoparticles

Author

Moriau, Leonard, primary, Bele, Marjan, additional, Marinko, Živa, additional, Ruiz-Zepeda, Francisco, additional, Koderman Podboršek, Gorazd, additional, Šala, Martin, additional, Šurca, Angelja Kjara, additional, Kovač, Janez, additional, Arčon, Iztok, additional, Jovanovič, Primož, additional, Hodnik, Nejc, additional, and Suhadolnik, Luka, additional

Published
2020
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42. Increasing the Oxygen-Evolution Reaction Performance of Nanotubular Titanium Oxynitride-Supported Ir Nanoparticles by a Strong Metal–Support Interaction

Author

Bele, Marjan, primary, Jovanovič, Primož, additional, Marinko, Živa, additional, Drev, Sandra, additional, Šelih, Vid Simon, additional, Kovač, Janez, additional, Gaberšček, Miran, additional, Koderman Podboršek, Gorazd, additional, Dražić, Goran, additional, Hodnik, Nejc, additional, Kokalj, Anton, additional, and Suhadolnik, Luka, additional

Published
2020
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46. Nanotubular Titanium Oxynitride with an Ultra-Low Iridium Loading as a High-Performance Oxygen-Evolution-Reaction Thin-Film Electrode

Author

Bele, Marjan, primary, Jovanovič, Primož, primary, Marinko, Živa, primary, Drev, Sandra, primary, Šelih, Vid Simon, primary, Kovač, Janez, primary, Gaberšček, Miran, primary, Koderman Podboršek, Gorazd, primary, Drazic, Goran, primary, Hodnik, Nejc, primary, Kokalj, Anton, primary, and Suhadolnik, Luka, primary

Published
2020
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47. Resolving the Dilemma of Nanoparticles’ Structure-Property Relationships at the Atomic Level: Case Study of Pt-Based PEM Fuel Cell Oxygen Reduction Electrocatalysts

Author

Moriau, Leonard Jean, primary, Gatalo, Matija, additional, Hrnjić, Armin, additional, Pavlišič, Andraž, additional, Kamšek, Ana Rebeka, additional, Petek, Urša, additional, Ruiz-Zepeda, Francisco, additional, Šala, Martin, additional, Pavko, Luka, additional, Šelih, Vid Simon, additional, Bele, Marjan, additional, Jovanovič, Primož, additional, and Hodnik, Nejc, additional

Published
2020
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49. A Double‐Passivation Water‐Based Galvanic Displacement Method for Reproducible Gram‐Scale Production of High‐Performance Platinum‐Alloy Electrocatalysts

Author

Gatalo, Matija, primary, Bele, Marjan, additional, Ruiz‐Zepeda, Francisco, additional, Šest, Ervin, additional, Šala, Martin, additional, Kamšek, Ana Rebeka, additional, Maselj, Nik, additional, Galun, Timotej, additional, Jovanovič, Primož, additional, Hodnik, Nejc, additional, and Gaberšček, Miran, additional

Published
2019
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