| Title: | Effect of the Morphology of the High-Surface-Area Support on the Performance of the Oxygen-Evolution Reaction for Iridium Nanoparticles |
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| Authors: | ID Moriau, Leonard, KI (Author)
ID Bele, Marjan, KI (Author)
ID Marinko, Živa, IJS (Author)
ID Ruiz-Zepeda, Francisco, KI (Author)
ID Koderman, Gorazd, KI (Author)
ID Šala, Martin, KI (Author)
ID Kjara Šurca, Angelija, KI (Author)
ID Kovač, Janez, IJS (Author)
ID Arčon, Iztok, UNG (Author)
ID Jovanovič, Primož, KI (Author)
ID Hodnik, Nejc, KI (Author)
ID Suhadolnik, Luka, KI (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | The development of affordable, low-iridium-loading,
scalable, active, and stable catalysts for the oxygen-evolution
reaction (OER) is a requirement for the commercialization of
proton-exchange membrane water electrolyzers (PEMWEs).
However, the synthesis of high-performance OER catalysts with
minimal use of the rare and expensive element Ir is very challenging
and requires the identification of electrically conductive and stable
high-surface-area support materials. We developed a synthesis
procedure for the production of large quantities of a nanocomposite
powder containing titanium oxynitride (TiONx) and Ir.
The catalysts were synthesized with an anodic oxidation process
followed by detachment, milling, thermal treatment, and the
deposition of Ir nanoparticles. The anodization time was varied to grow three different types of nanotubular structures exhibiting different lengths and wall thicknesses and thus a variety of properties. A comparison of milled samples with different degrees of nanotubular clustering and morphology retention, but with identical
chemical compositions and Ir nanoparticle size distributions and dispersions, revealed that the nanotubular support morphology is
the determining factor governing the catalyst’s OER activity and stability. Our study is supported by various state-of-the-art
materials’ characterization techniques, like X-ray photoelectron spectroscopy, scanning and transmission electron microscopies, Xray powder diffraction and absorption spectroscopy, and electrochemical cyclic voltammetry. Anodic oxidation proved to be a very suitable way to produce high-surface-area powder-type catalysts as the produced material greatly outperformed the IrO2 benchmarks
as well as the Ir-supported samples on morphologically different TiONx from previous studies. The highest activity was achieved for the sample prepared with 3 h of anodization, which had the most appropriate morphology for the effective removal of oxygen
bubbles. |
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| Keywords: | electrocatalysis, oxygen-evolution reaction, TiONx-Ir powder catalyst, iridium nanoparticles, anodic oxidation, morphology−activity correlation |
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| Year of publishing: | 2021 |
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| Number of pages: | 670-681 |
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| Numbering: | 11 |
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| PID: | 20.500.12556/RUNG-6098 |
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| COBISS.SI-ID: | 45043203 |
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| DOI: | https://doi.org/10.1021/acscatal.0c04741 |
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| NUK URN: | URN:SI:UNG:REP:SZPKOMZ1 |
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| Publication date in RUNG: | 04.01.2021 |
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| Views: | 3368 |
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| Downloads: | 0 |
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