Iridium stabilizes ceramic titanium oxynitride support for oxygen evolution reaction

Koderman Podboršek, Gorazd (author), Suhadolnik, Luka (author), Logar, Anja (author), Bele, Marjan (author), Hrnjić, Armin (author), Marinko, Živa (author), Kovač, Janez (author), Kokalj, Anton (author), Gašparič, Lea (author), Surca, Angelja Kjara (author), Kamšek, Ana Rebeka (author), Dražić, Goran (author), Gaberšček, Miran (author), Hodnik, Nejc (author), Jovanovič, Primož (author)

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.

• Language: English
• Keywords: electrocatalysis, oxygen evolution reaction, anodic oxidation, titanium oxynitride nanotubular support, iridium nanoparticles, IL-TEM, nano lab approach, single atoms, electron correlation, layers, nanoparticles, oxides, transition metals
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: Str. 15135–15145
• Numbering: Vol. 12, iss. 24
• PID: 20.500.12556/RUL-144316
• UDC: 544.5/.6
• ISSN on article: 2155-5435
• DOI: 10.1021/acscatal.2c04160
• COBISS.SI-ID: 135522051
• Publication date in RUL: 14.02.2023

Record is a part of a journal

• Title: ACS catalysis
• Shortened title: ACS catal.
• Publisher: American Chemical Society
• ISSN: 2155-5435
• COBISS.SI-ID: 518529817

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: elektrokemija, elektrokataliza, nanodelci, iridij, kisik