Iridium Stabilizes Ceramic Titanium Oxynitride Support for Oxygen Evolution Reaction
| Autor: | Koderman Podboršek, Gorazd, Suhadolnik, Luka, Lončar, Anja, Bele, Marjan, Hrnjić, Armin, Marinko, Živa, Kovač, Janez, Kokalj, Anton, Gašparič, Lea, Surca, Angelja Kjara, Kamšek, Ana Rebeka, Dražić, Goran, Gaberšček, Miran, Hodnik, Nejc, Jovanovič, Primož |
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| Rok vydání: | 2022 |
| Předmět: |
nanodelci
anodic oxidation General Chemistry electron correlation elektrokemija kisik Catalysis transition metals nano lab approach single atoms oxygen evolution reaction iridium nanoparticles iridij udc:544.5/.6 IL-TEM oxides electrocatalysis layers nanoparticles elektrokataliza titanium oxynitride nanotubular support |
| Zdroj: | ACS catalysis, vol. 12, no. 24, 2022. |
| ISSN: | 2155-5435 |
| Popis: | Decreasing iridium loading in the electrocatalyst presents a crucial challenge in the implementation of proton exchange membrane (PEM) electrolyzers. In this respect, fine dispersion of Ir on electrically conductive ceramic supports is a promising strategy. However, the supporting material needs to meet the demanding requirements such as structural stability and electrical conductivity under harsh oxygen evolution reaction (OER) conditions. Herein, nanotubular titanium oxynitride (TiON) is studied as a support for iridium nanoparticles. Atomically resolved structural and compositional transformations of TiON during OER were followed using a task-specific advanced characterization platform. This combined the electrochemical treatment under floating electrode configuration and identical location transmission electron microscopy (IL-TEM) analysis of an in-house-prepared Ir-TiON TEM grid. Exhaustive characterization, supported by density functional theory (DFT) calculations, demonstrates and confirms that both the Ir nanoparticles and single atoms induce a stabilizing effect on the ceramic support via marked suppression of the oxidation tendency of TiON under OER conditions. |
| Databáze: | OpenAIRE |
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