| Title: | Enhanced electrochemical dissolution of iridium oxide in acidic electrolytes through presence of metal ions : shortened lifetime and hope for recovery |
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| Authors: | ID Sharma, Raghunandan (Author)
ID Morgen, Per (Author)
ID Makovec, Darko, Institut "Jožef Stefan" (Author)
ID Gyergyek, Sašo, Institut "Jožef Stefan" (Author)
ID Andersen, Shuang Ma (Author) |
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| Files: |  URL - Source URL, visit https://pubs.rsc.org/en/content/articlelanding/2024/su/d4su00257a
 PDF - Presentation file, download (6,86 MB)
MD5: 0E8A1FC6403AFCC027D46F3F8BEEA5A4
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | Nanoparticulate Ir-oxides are frequently used as highly active and robust anode electrocatalysts for acidic water electrolyzers. While their dissolution during the electrolyzer operation is unsought, it could be a green route for recovery of Ir from the spent electrodes. In this study, we explore such a possibility and show that the electrochemical dissolution of Ir-oxides during a potential cycling treatment can be enhanced by introducing transition metal ions (such as Cu2+) in the acidic electrolyte. Dissolution of Ir from a nanoparticulate Ir-oxide containing electrode through potential cycling between 0.0 and 1.65 V in 1 M HCl increases by a factor of ∼3 in the presence of low concentrations (e.g. 10 mM) of Cu2+. Impact of the presence of the metal ions on the Ir-oxide dissolution mechanism is characterized. Cyclic deposition and stripping of the Cu2+ ion on the Ir-oxide may be attributed to the enhanced Ir dissolution, as evidenced by cyclic voltammograms studied in detail for Cu2+. Apart from exploration of the possibility of the electrochemical dissolution-based recovery of Ir from the spent Ir-oxide electrocatalysts, the study highlights the generally negative impacts of the presence of certain metal ions in the feedstock water on the electrocatalyst durability in acidic water electrolysis. Outcomes of this study are highly relevant for the fast-growing acidic water electrolysis industry. |
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| Keywords: | electrocatalysts, oxygen evolution reaction, acidic environment |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 21.05.2024 |
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| Article acceptance date: | 27.06.2024 |
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| Publication date: | 28.06.2024 |
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| Publisher: | The Royal Society of Chemistry |
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| Year of publishing: | 2024 |
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| Number of pages: | str. 2225-2238 |
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| Numbering: | Vol. 2, iss. 8 |
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| Source: | Združeno kraljestvo |
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| PID: | 20.500.12556/DiRROS-24942  |
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| UDC: | 544.5/.6 |
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| ISSN on article: | 2753-8125 |
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| DOI: | 10.1039/D4SU00257A |
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| COBISS.SI-ID: | 238853891 |
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| Copyright: | © 2024 The Author(s). |
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| Note: | Nasl. z nasl. zaslona;
Soavtorja iz Slovenije: Darko Makovec, Sašo Gyergyek;
Opis vira z dne 10. 6. 2025;
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| Publication date in DiRROS: | 05.01.2026 |
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| Views: | 226 |
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| Downloads: | 88 |
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