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Primož Jovanovič - One of the best experts on this subject based on the ideXlab platform.
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In situ Electrochemical Dissolution of platinum and gold in organic-based solvent
Nature Publishing Group, 2018Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc HodnikAbstract:Metal corrosion: Going organic A technique to study the Electrochemical Dissolution of metals has been upgraded to enable insights into their Dissolution in organic media. The ubiquitous use of metals means that understanding their stability in various environments is important. Techniques that involve the coupling of flow cells to mass spectrometers have been developed to monitor the Dissolution of noble metals in situ. However, these techniques have been limited to aqueous electrolytes, even though components such as batteries and capacitors function in pure organic or mixed organic/aqueous phases. Now, a team led by Vid Simon Šelih and Nejc Hodnik from the National Institute of Chemistry, Ljubljana, Slovenia, have developed a technique based on the coupling of an Electrochemical flow cell to inductively coupled plasma mass spectrometry that enables the in-situ monitoring of Electrochemical metal Dissolution in pure organic media
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Vid Simon ŠelihAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhibit superior stability and activity owing to the altered corrosion mechanism, where the formation of unstable Ir(>IV) species is hindered. Due to the enhanced and lasting OER performance, Electrochemically pre-oxidized E-Ir particles may be considered as the electrocatalyst of choice for an improved low-temperature Electrochemical hydrogen production device, namely a proton exchange membrane electrolyzer.
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new insights into corrosion of ruthenium and ruthenium oxide nanoparticles in acidic media
Journal of Physical Chemistry C, 2015Co-Authors: Nejc Hodnik, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B Hocevar, Andraž Pavlisic, Miran GaberscekAbstract:The Dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS). Online time- and potential-resolved Electrochemical Dissolution profiles revealed novel corrosion features (signals) in the potential window from 0 to ∼1.4 V, where known severe Dissolution due to the oxygen evolution reaction (OER) takes place. Most of the features follow the thermodynamic changes of the Ru oxidation/reduction state, which consequently trigger so-called transient Dissolution. An as-synthesized Ru sample was found to exhibit an order-of-magnitude higher Dissolution rate than an Electrochemically oxidized amorphous Ru sample. The latter, in turn, dissolved about 10 times faster than rutile RuO2. The observed OER activity was in an inverse relationship with the measured Dissolution. Disagreement was found with the general assumption that the onset of the OER sho...
Vid Simon Šelih - One of the best experts on this subject based on the ideXlab platform.
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In situ Electrochemical Dissolution of platinum and gold in organic-based solvent
Nature Publishing Group, 2018Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc HodnikAbstract:Metal corrosion: Going organic A technique to study the Electrochemical Dissolution of metals has been upgraded to enable insights into their Dissolution in organic media. The ubiquitous use of metals means that understanding their stability in various environments is important. Techniques that involve the coupling of flow cells to mass spectrometers have been developed to monitor the Dissolution of noble metals in situ. However, these techniques have been limited to aqueous electrolytes, even though components such as batteries and capacitors function in pure organic or mixed organic/aqueous phases. Now, a team led by Vid Simon Šelih and Nejc Hodnik from the National Institute of Chemistry, Ljubljana, Slovenia, have developed a technique based on the coupling of an Electrochemical flow cell to inductively coupled plasma mass spectrometry that enables the in-situ monitoring of Electrochemical metal Dissolution in pure organic media
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Vid Simon ŠelihAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhibit superior stability and activity owing to the altered corrosion mechanism, where the formation of unstable Ir(>IV) species is hindered. Due to the enhanced and lasting OER performance, Electrochemically pre-oxidized E-Ir particles may be considered as the electrocatalyst of choice for an improved low-temperature Electrochemical hydrogen production device, namely a proton exchange membrane electrolyzer.
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new insights into corrosion of ruthenium and ruthenium oxide nanoparticles in acidic media
Journal of Physical Chemistry C, 2015Co-Authors: Nejc Hodnik, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B Hocevar, Andraž Pavlisic, Miran GaberscekAbstract:The Dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS). Online time- and potential-resolved Electrochemical Dissolution profiles revealed novel corrosion features (signals) in the potential window from 0 to ∼1.4 V, where known severe Dissolution due to the oxygen evolution reaction (OER) takes place. Most of the features follow the thermodynamic changes of the Ru oxidation/reduction state, which consequently trigger so-called transient Dissolution. An as-synthesized Ru sample was found to exhibit an order-of-magnitude higher Dissolution rate than an Electrochemically oxidized amorphous Ru sample. The latter, in turn, dissolved about 10 times faster than rutile RuO2. The observed OER activity was in an inverse relationship with the measured Dissolution. Disagreement was found with the general assumption that the onset of the OER sho...
Samo B Hocevar - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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new insights into corrosion of ruthenium and ruthenium oxide nanoparticles in acidic media
Journal of Physical Chemistry C, 2015Co-Authors: Nejc Hodnik, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B Hocevar, Andraž Pavlisic, Miran GaberscekAbstract:The Dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS). Online time- and potential-resolved Electrochemical Dissolution profiles revealed novel corrosion features (signals) in the potential window from 0 to ∼1.4 V, where known severe Dissolution due to the oxygen evolution reaction (OER) takes place. Most of the features follow the thermodynamic changes of the Ru oxidation/reduction state, which consequently trigger so-called transient Dissolution. An as-synthesized Ru sample was found to exhibit an order-of-magnitude higher Dissolution rate than an Electrochemically oxidized amorphous Ru sample. The latter, in turn, dissolved about 10 times faster than rutile RuO2. The observed OER activity was in an inverse relationship with the measured Dissolution. Disagreement was found with the general assumption that the onset of the OER sho...
Nejc Hodnik - One of the best experts on this subject based on the ideXlab platform.
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In situ Electrochemical Dissolution of platinum and gold in organic-based solvent
Nature Publishing Group, 2018Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc HodnikAbstract:Metal corrosion: Going organic A technique to study the Electrochemical Dissolution of metals has been upgraded to enable insights into their Dissolution in organic media. The ubiquitous use of metals means that understanding their stability in various environments is important. Techniques that involve the coupling of flow cells to mass spectrometers have been developed to monitor the Dissolution of noble metals in situ. However, these techniques have been limited to aqueous electrolytes, even though components such as batteries and capacitors function in pure organic or mixed organic/aqueous phases. Now, a team led by Vid Simon Šelih and Nejc Hodnik from the National Institute of Chemistry, Ljubljana, Slovenia, have developed a technique based on the coupling of an Electrochemical flow cell to inductively coupled plasma mass spectrometry that enables the in-situ monitoring of Electrochemical metal Dissolution in pure organic media
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Vid Simon ŠelihAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhibit superior stability and activity owing to the altered corrosion mechanism, where the formation of unstable Ir(>IV) species is hindered. Due to the enhanced and lasting OER performance, Electrochemically pre-oxidized E-Ir particles may be considered as the electrocatalyst of choice for an improved low-temperature Electrochemical hydrogen production device, namely a proton exchange membrane electrolyzer.
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new insights into corrosion of ruthenium and ruthenium oxide nanoparticles in acidic media
Journal of Physical Chemistry C, 2015Co-Authors: Nejc Hodnik, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B Hocevar, Andraž Pavlisic, Miran GaberscekAbstract:The Dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS). Online time- and potential-resolved Electrochemical Dissolution profiles revealed novel corrosion features (signals) in the potential window from 0 to ∼1.4 V, where known severe Dissolution due to the oxygen evolution reaction (OER) takes place. Most of the features follow the thermodynamic changes of the Ru oxidation/reduction state, which consequently trigger so-called transient Dissolution. An as-synthesized Ru sample was found to exhibit an order-of-magnitude higher Dissolution rate than an Electrochemically oxidized amorphous Ru sample. The latter, in turn, dissolved about 10 times faster than rutile RuO2. The observed OER activity was in an inverse relationship with the measured Dissolution. Disagreement was found with the general assumption that the onset of the OER sho...
Martin Šala - One of the best experts on this subject based on the ideXlab platform.
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In situ Electrochemical Dissolution of platinum and gold in organic-based solvent
Nature Publishing Group, 2018Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc HodnikAbstract:Metal corrosion: Going organic A technique to study the Electrochemical Dissolution of metals has been upgraded to enable insights into their Dissolution in organic media. The ubiquitous use of metals means that understanding their stability in various environments is important. Techniques that involve the coupling of flow cells to mass spectrometers have been developed to monitor the Dissolution of noble metals in situ. However, these techniques have been limited to aqueous electrolytes, even though components such as batteries and capacitors function in pure organic or mixed organic/aqueous phases. Now, a team led by Vid Simon Šelih and Nejc Hodnik from the National Institute of Chemistry, Ljubljana, Slovenia, have developed a technique based on the coupling of an Electrochemical flow cell to inductively coupled plasma mass spectrometry that enables the in-situ monitoring of Electrochemical metal Dissolution in pure organic media
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Vid Simon Šelih, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B HocevarAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhi...
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Electrochemical Dissolution of iridium and iridium oxide particles in acidic media transmission electron microscopy Electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and x ray absorption spectroscopy study
Journal of the American Chemical Society, 2017Co-Authors: Primož Jovanovič, Martin Šala, Nejc Hodnik, Francisco Ruizzepeda, Iztok Arcon, Barbara Jozinovic, Milena Zorko, Marjan Bele, Vid Simon ŠelihAbstract:Iridium-based particles, regarded as the most promising proton exchange membrane electrolyzer electrocatalysts, were investigated by transmission electron microscopy and by coupling of an Electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometry. Additionally, studies using a thin-film rotating disc electrode, identical location transmission and scanning electron microscopy, as well as X-ray absorption spectroscopy have been performed. Extremely sensitive online time-and potential-resolved Electrochemical Dissolution profiles revealed that Ir particles dissolve well below oxygen evolution reaction (OER) potentials, presumably induced by Ir surface oxidation and reduction processes, also referred to as transient Dissolution. Overall, thermally prepared rutile-type IrO2 particles are substantially more stable and less active in comparison to as-prepared metallic and Electrochemically pretreated (E-Ir) analogues. Interestingly, under OER-relevant conditions, E-Ir particles exhibit superior stability and activity owing to the altered corrosion mechanism, where the formation of unstable Ir(>IV) species is hindered. Due to the enhanced and lasting OER performance, Electrochemically pre-oxidized E-Ir particles may be considered as the electrocatalyst of choice for an improved low-temperature Electrochemical hydrogen production device, namely a proton exchange membrane electrolyzer.
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new insights into corrosion of ruthenium and ruthenium oxide nanoparticles in acidic media
Journal of Physical Chemistry C, 2015Co-Authors: Nejc Hodnik, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Barbara Jozinovic, Milena Zorko, Marjan Bele, Samo B Hocevar, Andraž Pavlisic, Miran GaberscekAbstract:The Dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS). Online time- and potential-resolved Electrochemical Dissolution profiles revealed novel corrosion features (signals) in the potential window from 0 to ∼1.4 V, where known severe Dissolution due to the oxygen evolution reaction (OER) takes place. Most of the features follow the thermodynamic changes of the Ru oxidation/reduction state, which consequently trigger so-called transient Dissolution. An as-synthesized Ru sample was found to exhibit an order-of-magnitude higher Dissolution rate than an Electrochemically oxidized amorphous Ru sample. The latter, in turn, dissolved about 10 times faster than rutile RuO2. The observed OER activity was in an inverse relationship with the measured Dissolution. Disagreement was found with the general assumption that the onset of the OER sho...