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Ultrasonically Deposited Boron-Doped Silicon Decorated with Laser-Generated Iridium Nanoparticles as Manufacturing Approach for OER Electrodes in PEM Water Electrolysis

  • 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.

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Author:Norbert KazamerORCiD, Meike Tack, Mathias Spree, Martin Underberg, Ulrich RostORCiD, Sven ReichenbergerORCiD, Maximilian Cieluch, Haujin Salih, Florian Wirkert, Leonard Böhm, Jeffrey Roth, Varatharaja Nallathambi, Baptiste GaultORCiD, Christoph Baer, Kerstin Orend, Stephan BarcikowskiORCiD, Tim Hülser, Michael BrodmannORCiD
URN:urn:nbn:de:hbz:1010-opus4-46883
DOI:https://doi.org/10.1002/admi.202400765
Parent Title (English):Advanced Materials Interfaces
Publisher:Wiley
Document Type:Article
Language:English
Date of Publication (online):2025/01/13
Date of first Publication:2025/01/13
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2025/04/14
Tag:OER Electrodes; PEM Water Electrolysis
Volume:2025
Issue:Volume 12, Issue 8
Article Number:2400765
Page Number:13
Institutes:Institute / Westfälisches Energieinstitut
Licence (German):Creative Commons - Namensnennung
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