Bifunctional Pt–Ir nanoparticle catalysts for oxygen reduction and evolution reactions: investigating the influence of surface composition on the catalytic properties
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10478575" target="_blank" >RIV/00216208:11320/24:10478575 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/24:10478575
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=z2ndfzHg3j" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=z2ndfzHg3j</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d3se01238g" target="_blank" >10.1039/d3se01238g</a>
Alternative languages
Result language
angličtina
Original language name
Bifunctional Pt–Ir nanoparticle catalysts for oxygen reduction and evolution reactions: investigating the influence of surface composition on the catalytic properties
Original language description
Unitized regenerative fuel cells (URFCs) can provide renewable, clean energy and hydrogen but require efficient bifunctional catalysts for oxygen reduction (ORR) and evolution reactions (OER). In this study, we present iridium-decorated platinum nanoparticles with three different compositions, Ir(10)/Pt(90), Ir(20)/Pt(80), and Ir(40)/Pt(60). The nanoparticles' morphology and chemical structure were analysed before and after electrochemical activation to determine the optimal composition of the catalyst with the highest efficiency towards ORR and OER. Ir(40)/Pt(60) showed the highest mass activity towards OER of 571.4 mA mg_Ir(-1) at 1.525 V(RHE), which was 1.5 times higher compared to commercial Ir black with 371.1 mA mg_Ir(-1). In addition, the mass activity for ORR exhibited a positive correlation with the total of surface Pt active sites but decreased with the coverage of Pt nanoparticles by decorating Ir nanoparticles. Among the studied bimetallic nanoparticles, Ir(20)/Pt(80) exhibited the highest efficiency at 57.7% and was considered the most promising URFC catalyst. Unitized regenerative fuel cells demand efficient bifunctional catalysts for oxygen reduction and evolution reactions. Here, we study iridium-decorated platinum nanoparticles. Ir(40)/Pt(60) displayed the highest OER mass activity, surpassing Ir black, whereas Ir(20)/Pt(80) showed the highest efficiency.
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
10403 - Physical chemistry
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)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Sustainable Energy & Fuels
ISSN
2398-4902
e-ISSN
2398-4902
Volume of the periodical
8
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
14
Pages from-to
797-810
UT code for WoS article
001143411300001
EID of the result in the Scopus database
2-s2.0-85182781457