Oxygen reduction on nanocrystalline ruthenia ? local structure effects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F15%3A00437180" target="_blank" >RIV/61388955:_____/15:00437180 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1039/C4RA10001H" target="_blank" >http://dx.doi.org/10.1039/C4RA10001H</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/C4RA10001H" target="_blank" >10.1039/C4RA10001H</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Oxygen reduction on nanocrystalline ruthenia ? local structure effects

Popis výsledku v původním jazyce

Nanocrystalline ruthenium dioxide and doped ruthenia of the composition Ru1xMxO2 (M = Co, Ni, Zn) with 0 x 0.2 were prepared by the spray-freezing freeze-drying technique. The oxygen reduction activity and selectivity of the prepared materials were evaluated in alkaline media using the RRDE methodology. All ruthenium based oxides show a strong preference for a 2-electron oxygen reduction pathway at low overpotentials. The catalysts' selectivity shifts towards the 4-electron reduction pathway at high overpotentials (i.e. at potentials below 0.4 V vs. RHE). This trend is particularly noticeable on non-doped and Zn-doped catalysts; the materials containing Ni and Co produce a significant fraction of hydrogen peroxide even at high overpotentials. The suppression of the 4-electron reduction pathway on Ni and Co-doped catalysts can be accounted for by the presence of the Ni and Co cations in the cus binding sites as shown by the DFT-based analyses on non-doped and doped catalysts.

Název v anglickém jazyce

Oxygen reduction on nanocrystalline ruthenia ? local structure effects

Popis výsledku anglicky

Nanocrystalline ruthenium dioxide and doped ruthenia of the composition Ru1xMxO2 (M = Co, Ni, Zn) with 0 x 0.2 were prepared by the spray-freezing freeze-drying technique. The oxygen reduction activity and selectivity of the prepared materials were evaluated in alkaline media using the RRDE methodology. All ruthenium based oxides show a strong preference for a 2-electron oxygen reduction pathway at low overpotentials. The catalysts' selectivity shifts towards the 4-electron reduction pathway at high overpotentials (i.e. at potentials below 0.4 V vs. RHE). This trend is particularly noticeable on non-doped and Zn-doped catalysts; the materials containing Ni and Co produce a significant fraction of hydrogen peroxide even at high overpotentials. The suppression of the 4-electron reduction pathway on Ni and Co-doped catalysts can be accounted for by the presence of the Ni and Co cations in the cus binding sites as shown by the DFT-based analyses on non-doped and doped catalysts.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CG - Elektrochemie

OECD FORD obor

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Projekt

<a href="/cs/project/GAP108%2F12%2F1889" target="_blank" >GAP108/12/1889: Nové elektrokatalytické a fluorescentní materiály na bázi sulfidů připravené vysokotlakými postupy a syntézou z roztoku</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

RSC Advances

ISSN

2046-2069

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

1235-1243

Kód UT WoS článku

000346079900048

EID výsledku v databázi Scopus

2-s2.0-84916623137