Atomic layer deposited Ir nanostructures on titania nanotube layers for efficient alkaline hydrogen evolution reaction
The result's identifiers
Result code in 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>
Alternative codes found
RIV/00216305:26620/26:0198250
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Atomic layer deposited Ir nanostructures on titania nanotube layers for efficient alkaline hydrogen evolution reaction
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Result continuities
Project
<a href="/en/project/GX23-08019X" target="_blank" >GX23-08019X: Single-Atom-based 2D-Photocatalysts</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Electrochimica Acta
ISSN
0013-4686
e-ISSN
1873-3859
Volume of the periodical
535
Issue of the periodical within the volume
September 2025
Country of publishing house
GB - UNITED KINGDOM
Number of pages
9
Pages from-to
146607
UT code for WoS article
001506292100007
EID of the result in the Scopus database
2-s2.0-105007143159