Strain-Engineered Ir Shell Enhances Activity and Stability of Ir-Ru Catalysts for Water Electrolysis: An Operando Wide-Angle X-Ray Scattering Study
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10501545" target="_blank" >RIV/00216208:11320/25:10501545 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=.8-~DBu5HO" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=.8-~DBu5HO</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/aenm.202403738" target="_blank" >10.1002/aenm.202403738</a>
Alternative languages
Result language
angličtina
Original language name
Strain-Engineered Ir Shell Enhances Activity and Stability of Ir-Ru Catalysts for Water Electrolysis: An Operando Wide-Angle X-Ray Scattering Study
Original language description
Ir-Ru alloys with high Ru content serve as stable and highly active catalysts for the Oxygen Evolution Reaction (OER) in Proton Exchange Membrane Water Electrolyzers (PEM-WEs), enabling efficient operation with low Ir loadings (150 mu g cm-2). Despite this, the mechanisms behind their enhanced stability remain unclear. In this study, operando Wide-Angle X-ray Scattering (WAXS) and ex situ techniques are utilized to investigate the structural evolution of these magnetron-sputtered alloys during a PEM-WE operation. The findings reveal that Ru leaches from the surface upon potential application, forming a dynamic Ir-Ru@IrOx core-shell structure. The Ir shell, strained by the Ir-Ru core, maintains a lower oxidation state than pure Ir catalyst, leading to superior catalytic activity and stability. Remarkably, the Ir-Ru 25:75 catalyst demonstrates better stability over Ir-Ru 50:50, despite its higher Ru content, due to the better protection of the subsurface Ir and Ru from oxidation and dissolution. This study not only clarifies the performance-enhancing mechanisms of Ir-Ru catalysts but also suggests that other, more economical materials, such as Co or Ti, could serve as effective cores in Ir-M systems, offering a pathway to more cost-effective catalysts for PEM-WE applications.
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
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
ADVANCED ENERGY MATERIALS
ISSN
1614-6832
e-ISSN
1614-6840
Volume of the periodical
15
Issue of the periodical within the volume
12
Country of publishing house
DE - GERMANY
Number of pages
13
Pages from-to
2403738
UT code for WoS article
001393206800001
EID of the result in the Scopus database
2-s2.0-105001083080