Iridium stabilizes ceramic titanium oxynitride support for oxygen evolution reaction

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

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.

• Jezik: Angleški jezik
• Ključne besede: 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
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: Str. 15135–15145
• Številčenje: Vol. 12, iss. 24
• PID: 20.500.12556/RUL-144316
• UDK: 544.5/.6
• ISSN pri članku: 2155-5435
• DOI: 10.1021/acscatal.2c04160
• COBISS.SI-ID: 135522051
• Datum objave v RUL: 14.02.2023

Gradivo je del revije

• Naslov: ACS catalysis
• Skrajšan naslov: ACS catal.
• Založnik: American Chemical Society
• ISSN: 2155-5435
• COBISS.SI-ID: 518529817

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: elektrokemija, elektrokataliza, nanodelci, iridij, kisik