Reduced grey brookite for noble metal free photocatalytic H2evolution

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F21%3A73612429" target="_blank" >RIV/61989592:15640/21:73612429 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2021/ta/d0ta09066b" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2021/ta/d0ta09066b</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d0ta09066b" target="_blank" >10.1039/d0ta09066b</a>

Result language

angličtina

Original language name

Reduced grey brookite for noble metal free photocatalytic H2evolution

Original language description

Herein we introduce for the first time a reduced &quot;grey&quot; brookite TiO2 photocatalyst, produced by thermal hydrogenation of brookite nanoparticles, that shows a remarkable noble metal free photocatalytic H-2 evolution. Its activity is substantially higher than that of other TiO2 polymorphs, i.e. anatase or rutile, comparably sized and activated by hydrogenation under optimized conditions. Along with brookite powders, an oriented brookite single crystal was investigated as a defined surface to confirm the effects of the hydrogenation treatment. By a combination of electron paramagnetic resonance (EPR), electron and X-ray characterization techniques applied to the powders and single crystal, we find that hydrogenation forms in brookite a defective crystalline surface layer rich in Ti3+ states. Amorphization effects, i.e. forming the so called &quot;amorphous shell&quot; as reported in previous work for black anatase TiO2, were not detected. Overall, we provide experimental evidence that hydrogenation forms in brookite a surface strained zone with point defects that are mediators for electron transfer to H2O, leading to a significantly enhanced noble metal free photocatalytic H-2 evolution in comparison to anatase.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

21001 - Nano-materials (production and properties)

Project

—

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

Name of the periodical

Journal of Materials Chemistry A

ISSN

2050-7488

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

1168-1179

UT code for WoS article

000609149500040

EID of the result in the Scopus database

2-s2.0-85099572573