Iridium Stabilizes Ceramic Titanium Oxynitride Support for Oxygen Evolution Reaction

Overview

Journal ACS Catal

Publisher American Chemical Society

Date 2022 Dec 26

PMID 36570081

Authors

Gorazd Koderman Podborsek

Luka Suhadolnik

Anja Loncar

Marjan Bele

Armin Hrnjic

Ziva Marinko

Janez Kovac

Anton Kokalj

Lea Gasparic

Angelja Kjara Surca

Ana Rebeka Kamsek

Goran Drazic

Miran Gaberscek

Nejc Hodnik

Primoz Jovanovic

Affiliations

Soon will be listed here.

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.

Citing Articles

Recent progress in the development of advanced support materials for electrocatalysis.

Smiljanic M, Srejic I, Georgijevic J, Maksic A, Bele M, Hodnik N Front Chem. 2023; 11:1304063.

PMID: 38025069 PMC: 10665529. DOI: 10.3389/fchem.2023.1304063.

"" Advanced Characterization Platform for Studying Electrocatalytic Iridium Nanoparticles Dispersed on TiON Supports Prepared on Ti Transmission Electron Microscopy Grids.

Bele M, Podborsek G, Loncar A, Jovanovic P, Hrnjic A, Marinko Z ACS Appl Nano Mater. 2023; 6(12):10421-10430.

PMID: 37384128 PMC: 10294127. DOI: 10.1021/acsanm.3c01368.

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