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Koderman Podboršek G, Suhadolnik L, Lončar A, Bele M, Hrnjić A, Marinko Ž, Kovač J, Kokalj A, Gašparič L, Surca AK, Kamšek AR, Dražić G, Gaberšček M, Hodnik N, Jovanovič P. Iridium Stabilizes Ceramic Titanium Oxynitride Support for Oxygen Evolution Reaction. ACS Catal 2022; 12:15135-15145. [PMID: 36570081 PMCID: PMC9764282 DOI: 10.1021/acscatal.2c04160] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 10/17/2022] [Indexed: 11/30/2022]
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.
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Affiliation(s)
- Gorazd Koderman Podboršek
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000Ljubljana, Slovenia
| | - Luka Suhadolnik
- Department
for Nanostructured Materials, Jožef
Stefan Institute, Jamova 39, SI-1000Ljubljana, Slovenia,Department
of Chemical and Pharmaceutical Sciences, University of Trieste, via L. Giorgieri 1, 34127Trieste, Italy,
| | - Anja Lončar
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,University
of Nova Gorica, Vipavska
13, SI-5000Nova
Gorica, Slovenia
| | - Marjan Bele
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,
| | - Armin Hrnjić
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,University
of Nova Gorica, Vipavska
13, SI-5000Nova
Gorica, Slovenia
| | - Živa Marinko
- Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000Ljubljana, Slovenia,Department
for Nanostructured Materials, Jožef
Stefan Institute, Jamova 39, SI-1000Ljubljana, Slovenia
| | - Janez Kovač
- Department
of Surface Engineering, Jožef Stefan
Institute, Jamova 39, SI-1000Ljubljana, Slovenia
| | - Anton Kokalj
- Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000Ljubljana, Slovenia,Department
of Physical and Organic Chemistry, Jožef
Stefan Institute, Jamova
39, SI-1000Ljubljana, Slovenia
| | - Lea Gašparič
- Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000Ljubljana, Slovenia,Department
of Physical and Organic Chemistry, Jožef
Stefan Institute, Jamova
39, SI-1000Ljubljana, Slovenia,Centre
of Excellence for Low-Carbon Technologies, Hajdrihova 19, SI-1000Ljubljana, Slovenia
| | - Angelja Kjara Surca
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia
| | - Ana Rebeka Kamšek
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,Faculty
of Chemistry and Chemical Engineering, University
of Ljubljana, Večna
pot 113, SI-1000Ljubljana, Slovenia
| | - Goran Dražić
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000Ljubljana, Slovenia
| | - Miran Gaberšček
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia
| | - Nejc Hodnik
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000Ljubljana, Slovenia,University
of Nova Gorica, Vipavska
13, SI-5000Nova
Gorica, Slovenia
| | - Primož Jovanovič
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova 19, SI-1000Ljubljana, Slovenia,
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