Atomic layer deposited Ir nanostructures on titania nanotube layers for efficient alkaline hydrogen evolution reaction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F25%3A39923245" target="_blank" >RIV/00216275:25310/25:39923245 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/26:0198250

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0013468625009685?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0013468625009685?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2025.146607" target="_blank" >10.1016/j.electacta.2025.146607</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Atomic layer deposited Ir nanostructures on titania nanotube layers for efficient alkaline hydrogen evolution reaction

Popis výsledku v původním jazyce

Herein, we present the deposition and use of Iridium (Ir) electrocatalysts by Atomic Layer Deposition (ALD) on TiO2 nanotube layers (TNTs) towards Hydrogen Evolution Reaction (HER) in alkaline media. We demonstrate a precise control over Ir ALD deposition by varying the number of ALD cycles from 25 to 300, obtaining singleatoms (SAs), clusters and nanoparticles (NPs). TNTs decorated with Ir using 200 ALD cycles exhibited superior HER performance with a low overpotential value of 34 mV, minimal charge transfer resistance of 0.2 Omega and a low Tafel slope of 37 mV dec-1. Long-term stability tests revealed gradual activity degradation due to a partial oxidation of Ir. Notably, while the 200 cycles coating showed the lowest overpotential, the 150 cycles coating demonstrated the highest turnover frequency (TOF) of 1.08 s-1, indicating that optimal use of the available active sites for improved HER performance. This results from the balance between the Ir content and the available active sites, rather than solely relying on electrochemically active surface area (ECSA) or overpotential values. This work provides insights into the complex relationship between Ir nanostructure, oxidation states and catalytic efficiency, contributing to the development of more effective HER catalysts.

Název v anglickém jazyce

Atomic layer deposited Ir nanostructures on titania nanotube layers for efficient alkaline hydrogen evolution reaction

Popis výsledku anglicky

Herein, we present the deposition and use of Iridium (Ir) electrocatalysts by Atomic Layer Deposition (ALD) on TiO2 nanotube layers (TNTs) towards Hydrogen Evolution Reaction (HER) in alkaline media. We demonstrate a precise control over Ir ALD deposition by varying the number of ALD cycles from 25 to 300, obtaining singleatoms (SAs), clusters and nanoparticles (NPs). TNTs decorated with Ir using 200 ALD cycles exhibited superior HER performance with a low overpotential value of 34 mV, minimal charge transfer resistance of 0.2 Omega and a low Tafel slope of 37 mV dec-1. Long-term stability tests revealed gradual activity degradation due to a partial oxidation of Ir. Notably, while the 200 cycles coating showed the lowest overpotential, the 150 cycles coating demonstrated the highest turnover frequency (TOF) of 1.08 s-1, indicating that optimal use of the available active sites for improved HER performance. This results from the balance between the Ir content and the available active sites, rather than solely relying on electrochemically active surface area (ECSA) or overpotential values. This work provides insights into the complex relationship between Ir nanostructure, oxidation states and catalytic efficiency, contributing to the development of more effective HER catalysts.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/GX23-08019X" target="_blank" >GX23-08019X: Jednoatomové 2D fotokatalyzátory</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Electrochimica Acta

ISSN

0013-4686

e-ISSN

1873-3859

Svazek periodika

535

Číslo periodika v rámci svazku

September 2025

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

146607

Kód UT WoS článku

001506292100007

EID výsledku v databázi Scopus

2-s2.0-105007143159