Oxygen reduction on nanocrystalline ruthenia ? local structure effects

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Oxygen reduction on nanocrystalline ruthenia ? local structure effects

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CG - Electrochemistry

OECD FORD branch

—

Project

<a href="/en/project/GAP108%2F12%2F1889" target="_blank" >GAP108/12/1889: New electrocatalytic and fluorescent sulfide-based materials prepared by high pressure and solution synthesis methods</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

RSC Advances

ISSN

2046-2069

e-ISSN

—

Volume of the periodical

5

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

1235-1243

UT code for WoS article

000346079900048

EID of the result in the Scopus database

2-s2.0-84916623137