20.500.12556/RUL-156061 Adjusting the operational potential window as a tool for prolonging the durability of carbon-supported Pt-alloy nanoparticles as oxygen reduction reaction electrocatalysts A current trend in the investigation of state-of-the-art Pt-alloys as proton exchange membrane fuel cell (PEMFC) electrocatalysts is to study their long-term stability as a bottleneck for their full commercialization. Although many parameters have been appropriately addressed, there are still certain issues that must be considered. Here, the stability of an experimental Pt-Co/C electrocatalyst is investigated by high-temperature accelerated degradation tests (HT-ADTs) in a high-temperature disk electrode (HT-DE) setup, allowing the imitation of close-to-real operational conditions in terms of temperature (60 °C). Although the US Department of Energy (DoE) protocol has been chosen as the basis of the study (30,000 trapezoidal wave cycling steps between 0.6 and 0.95 V$_{RHE}$ with a 3 s hold time at both the lower potential limit (LPL) and the upper potential limit (UPL)), this works demonstrates that limiting both the LPL and UPL (from 0.6−0.95 to 0.7−0.85 V$_{RHE}$) can dramatically reduce the degradation rate of state-of-the-art Pt-alloy electrocatalysts. This has been additionally confirmed with the use of an electrochemical flow cell coupled to inductively coupled plasma mass spectrometry (EFC-ICP-MS), which enables real-time monitoring of the dissolution mechanisms of Pt and Co. In line with the HT-DE methodology observations, a dramatic decrease in the total dissolution of Pt and Co has once again been observed upon narrowing the potential window to 0.7−0.85 V$_{RHE}$ rather than 0.6−0.95 V$_{RHE}$. Additionally, the effect of the potential hold time at both LPL and UPL on metal dissolution has also been investigated. The findings demonstrate that the dissolution rate of both metals is proportional to the hold time at UPL regardless of the applied potential window, whereas the hold time at the LPL does not appear to be as detrimental to the stability of metals. fuel cells oxygen reduction reaction platinum alloys durability accelerated degradation tests potential window hold time dissolution electrocatalysts electrodes metals platinum elektrokemija gorivne celice zlitine platina reakcija redukcije kisika true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-06 15:33:13 2024-05-06 15:33:14 2024-06-17 13:02:36 0000-00-00 00:00:00 2024 0 0 Str. 4303–4317 iss. 6 Vol. 14 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.5/.6 2155-5435 10.1021/acscatal.3c06251 190114819 dukic-et-al-2024-adjusting-the-operational-potential-window-as-a-tool-for-prolonging-the-durability-of-carbon-supported.pdf dukic-et-al-2024-adjusting-the-operational-potential-window-as-a-tool-for-prolonging-the-durability-of-carbon-supported.pdf 1 319AD57221E2937F35308C4A3BFBB33D c2472f9dfafa5816cd8e7d48fda34052152612dca3b77baa53fd3e6e912b60f1 64b559ee-0bad-11ef-ab55-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183279 https://pubs.acs.org/doi/10.1021/acscatal.3c06251 0 49367bc0-0bad-11ef-ab55-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183278 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0