@article{KazamerTackSpreeetal.2025, author = {Kazamer, Norbert and Tack, Meike and Spree, Mathias and Underberg, Martin and Rost, Ulrich and Reichenberger, Sven and Cieluch, Maximilian and Salih, Haujin and Wirkert, Florian Josef and B{\"o}hm, Leonard and Roth, Jeffrey and Nallathambi, Varatharaja and Gault, Baptiste and Baer, Christoph and Orend, Kerstin and Barcikowski, Stephan and H{\"u}lser, Tim and Brodmann, Michael}, title = {Ultrasonically Deposited Boron-Doped Silicon Decorated with Laser-Generated Iridium Nanoparticles as Manufacturing Approach for OER Electrodes in PEM Water Electrolysis}, series = {Advanced Materials Interfaces}, volume = {2025}, journal = {Advanced Materials Interfaces}, number = {Volume 12, Issue 8}, publisher = {Wiley}, doi = {10.1002/admi.202400765}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:1010-opus4-46883}, pages = {13}, year = {2025}, abstract = {The study introduces flexible and scalable manufacturing approach for electrodes utilizing boron-doped silicon as conductive support for iridium nanoparticles, addressing the challenges of cost and scarcity associated with noble catalysts for oxygen evolution reaction (OER). Colloidal Ir nanoparticles are synthesized via pulsed-laser ablation (≈4-7 nm) and decorated on B-doped Si (≈100 nm) through electrostatic adsorption. Titanium substrates are ultrasonically sprayed with Si:B - Ir and Ir nanoparticles with very low iridium loading of 12 wt.\%. Crystalline Ir phases (Ir(111), Ir(200)) are observed and known to enhance the OER mechanism. Additionally, atom probe tomography confirms that the Si support particles contained 0.03-0.5 at.\% of boron throughout the entire particle, while electrical permittivity and through-plane measurements reveal a positive impact of B-doped Si on the electrical conductivity of the nanocatalysts and of the ultralow-loaded catalyst coated Ti substrates (0.12 mgIr cm-2), respectively. Rotating disk electrode results show pronounced oxidation peaks for decorated Ir nanoparticles. The Si:B-Ir 4 nm catalyst exhibits the highest turnover frequency (2.62 s-1) and a competitive electrochemical surface area (25 m2 gIr-1) compared to Si:B-Ir 7 nm (0.96 s-1; 37.5 m2 gIr-1) and Ir black (0.24 s-1; 5 m2 gIr-1). The overall analysis of the parameters highlights a performant catalytic efficiency, through balancing activity and reaction kinetics effectively.}, language = {en} } @inproceedings{BoehmKazamerHoltkotteetal.2020, author = {B{\"o}hm, Leonard and Kazamer, Norbert and Holtkotte, Lisa and N{\"a}ther, Johannes and Rost, Ulrich and Underberg, Martin and Marginean, Gabriela and H{\"u}lser, Tim and Brodmann, Michael and K{\"o}ster, Frank}, title = {Pulsed electrodeposition of iridium catalyst nanoparticles on titanium suboxide supports for application in PEM electrolysis}, series = {Konferenz: "8th International Conference on Advanced Materials and Structures - AMS 2020", 7.-9. Oktober 2020 in Timișoara (Rum{\"a}nien)}, booktitle = {Konferenz: "8th International Conference on Advanced Materials and Structures - AMS 2020", 7.-9. Oktober 2020 in Timișoara (Rum{\"a}nien)}, year = {2020}, language = {en} }