20.500.12556/DiRROS-24942 Enhanced electrochemical dissolution of iridium oxide in acidic electrolytes through presence of metal ions shortened lifetime and hope for recovery Enhanced electrochemical dissolution of iridium oxide in acidic electrolytes through presence of metal ions: shortened lifetime and hope for recovery 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. electrocatalysts oxygen evolution reaction acidic environment elektrokatalizatorji true false true The Royal Society of Chemistry Združeno kraljestvo Angleški jezik Slovenski jezik © 2024 The Author(s). Neznano 2026-01-05 10:48:04 2026-01-05 10:48:04 2026-01-06 03:43:48 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Soavtorja iz Slovenije: Darko Makovec, Sašo Gyergyek; Opis vira z dne 10. 6. 2025; str. 2225-2238 iss. 8 Vol. 2 Aug. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-05-21 2024-06-27 2024-06-28 544.5/.6 2753-8125 10.1039/D4SU00257A 238853891 https://pubs.rsc.org/en/content/articlelanding/2024/su/d4su00257a 1 a3b92a15-ea1b-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=37360 RAZ_Sharma_Raghunandan_2024.pdf RAZ_Sharma_Raghunandan_2024.pdf 1 0E8A1FC6403AFCC027D46F3F8BEEA5A4 f52f4c0b53b29e70c1527466b0f1c88f9221d8e67681ae028063ace9a9dc3a44 0438a266-ea1c-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=37361 Institut Jožef Stefan 0 0 0