Synergistic effects in oxygen evolution activity of mixed iridium-ruthenium pyrochlores

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F21%3A00559769" target="_blank" >RIV/61388955:_____/21:00559769 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0332972" target="_blank" >https://hdl.handle.net/11104/0332972</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.electacta.2020.137327" target="_blank" >10.1016/j.electacta.2020.137327</a>

Result language
angličtina
Original language name
Synergistic effects in oxygen evolution activity of mixed iridium-ruthenium pyrochlores
Original language description
Pyrochlore oxides (A(2)B(2)O(7)) simultaneously containing iridium and ruthenium in the B-site are promising catalysts for oxygen evolution reaction (OER) in acid media. The catalytic activity of the pyrochlore based catalysts is increased by the coexistence of Ir and Ru in the B-site of the pyrochlore structure. Lanthanide (Yb, Gd, or Nd) stabilized mixed pyrochlores with a fraction of Ru in the B-site of x(Ru) = 0.2, 0.4, 0.6, 0.8 were synthesized by the spray-freeze freeze-dry approach. All prepared mixed pyrochlore catalysts are surpassing the OER activity of the corresponding iridium and ruthenium analogues featuring no cation mixing as well as that of the benchmark IrO2 catalyst. The synergy of Ir and Ru in the B-site of the pyrochlore structure suppresses the effect of the A-site cation radius on the OER activity. The observed OER activity scales with the Ir-Ru bond distance which represents the local structure of the prepared materials. The most active ytterbium catalyst also shows a significant stability improvement under OER operando conditions over the benchmark IrO2. (C) 2020 Elsevier Ltd. All rights reserved.
Czech name
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Czech description
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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)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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