Strain-Engineered Ir Shell Enhances Activity and Stability of Ir-Ru Catalysts for Water Electrolysis: An Operando Wide-Angle X-Ray Scattering Study

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Strain-Engineered Ir Shell Enhances Activity and Stability of Ir-Ru Catalysts for Water Electrolysis: An Operando Wide-Angle X-Ray Scattering Study

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Strain-Engineered Ir Shell Enhances Activity and Stability of Ir-Ru Catalysts for Water Electrolysis: An Operando Wide-Angle X-Ray Scattering Study

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

ADVANCED ENERGY MATERIALS

ISSN

1614-6832

e-ISSN

1614-6840

Svazek periodika

15

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

13

Strana od-do

2403738

Kód UT WoS článku

001393206800001

EID výsledku v databázi Scopus

2-s2.0-105001083080