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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

1873-3859

Svazek periodika

366

Číslo periodika v rámci svazku

JSN 2021

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

137327

Kód UT WoS článku

000596030500011

EID výsledku v databázi Scopus

2-s2.0-85095916524