20.500.12556/RUL-148253 “Nano Lab” advanced characterization platform for studying electrocatalytic iridium nanoparticles dispersed on TiO$_x$N$_y$ supports prepared on Ti transmission electron microscopy grids Aiming at speeding up the discovery and understanding of promising electrocatalysts, a novel experimental platform, i.e., the Nano Lab, is introduced. It is based on state-of-the-art physicochemical characterization and atomic-scale tracking of individual synthesis steps as well as subsequent electrochemical treatments targeting nanostructured composites. This is provided by having the entire experimental setup on a transmission electron microscopy (TEM) grid. Herein, the oxygen evolution reaction nanocomposite electrocatalyst, i.e., iridium nanoparticles dispersed on a high-surface-area TiO$_x$N$_y$ support prepared on the Ti TEM grid, is investigated. By combining electrochemical concepts such as anodic oxidation of TEM grids, floating electrode-based electrochemical characterization, and identical location TEM analysis, relevant information from the entire composite’s cycle, i.e., from the initial synthesis step to electrochemical operation, can be studied. We reveal that Ir nanoparticles as well as the TiO$_x$N$_y$ support undergo dynamic changes during all steps. The most interesting findings made possible by the Nano Lab concept are the formation of Ir single atoms and only a small decrease in the N/O ratio of the TiO$_x$N$_y$−Ir catalyst during the electrochemical treatment. In this way, we show that the precise influence of the nanoscale structure, composition, morphology, and electrocatalyst’s locally resolved surface sites can be deciphered on the atomic level. Furthermore, the Nano Lab’s experimental setup is compatible with ex situ characterization and other analytical methods, such as Raman spectroscopy, X-ray photoelectron spectroscopy, and identical location scanning electron microscopy, hence providing a comprehensive understanding of structural changes and their effects. Overall, an experimental toolbox for the systematic development of supported electrocatalysts is now at hand. Nano Lab concept anodic oxidation IL-TEM electrocatalysis oxygen evolution reaction iridium nanoparticles catalysts oxides radiology transition metals transmission electron microscopy kataliza elektrokatalizatorji nanokompoziti elektrokemija iridij true false true Angleški jezik Slovenski jezik Članek v reviji 2023-08-07 11:35:10 2023-08-07 11:35:14 2023-08-08 03:39:50 0000-00-00 00:00:00 2023 0 0 Str. 10421–10430 iss. 12 Vol. 6 23 Jun. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.3/.4 2574-0970 10.1021/acsanm.3c01368 158882563 acsanm.3c01368.pdf acsanm.3c01368.pdf 1 EDF7D30364417C08C8459C231F176331 8f73ab846b128c47f14be3e469bc6ffbc34f1c7f95ce24d3581fd79f37cff031 d6b8f813-3505-11ee-aeaf-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172312 https://pubs.acs.org/doi/10.1021/acsanm.3c01368 1 b307d5c9-3505-11ee-aeaf-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172311 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0