Gorazd Koderman Podboršek (Author), Luka Suhadolnik (Author), Anja Lončar (Author), Marjan Bele (Author), Armin Hrnjić (Author), Živa Marinko (Author), Miran Gaberšček (Author), Nejc Hodnik (Author), Primož Jovanovič (Author), Janez Kovač (Author), Anton Kokalj (Author), Lea Gašparič (Author), Angela Šurca Vuk (Author), Ana Rebeka Kamšek (Author), Goran Dražić (Author)

Abstract

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.

Keywords

elektrokemija;elektrokataliza;nanodelci;iridij;kisik;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: KI - National Institute of Chemistry
Publisher: ACS Publications
UDC: 544.5/.6
COBISS: 135522051 Link will open in a new window
ISSN: 2155-5435
Views: 34
Downloads: 9
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Other data

Secondary language: Slovenian
Secondary keywords: elektrokemija;elektrokataliza;nanodelci;iridij;kisik;
Type (COBISS): Article
Source comment: Nasl. z nasl. zaslona; Opis vira z dne 28. 12. 2022;
Pages: str. 15135–15145
Volume: ǂVol. ǂ12
Issue: ǂiss. ǂ24
Chronology: Nov. 28, 2022
DOI: 10.1021/acscatal.2c04160
ID: 26352466